US3888998A

US3888998A - Beverage carbonation

Info

Publication number: US3888998A
Application number: US302149A
Authority: US
Inventors: Ronald Lee Sampson; David Denzil Whyte
Original assignee: Procter and Gamble Co
Current assignee: Procter and Gamble Co
Priority date: 1971-11-22
Filing date: 1972-10-30
Publication date: 1975-06-10
Anticipated expiration: 1992-06-10

Abstract

Beverage carbonation methods, compositions and devices employing carbon dioxide-containing molecular sieves. Upon contact with aqueous solutions carbon dioxide is released from such molecular sieves and thereupon dissolves in the liquid to provide a carbonated beverage.

Description

United States Patent Sampson et al.

[ June 10, 1975 BEVERAGE CARBONATION Inventors: Ronald Lee Sampson, Cincinnati;

David Denzil Whyte, Wyoming, both of Ohio The Procter & Gamble Company, Cincinnati, Ohio Filed: Oct. 30, 1972 Appl. No.: 302,149

Related U.S. Application Data Continuation-in-part of Ser. No. 200,849, Nov. 22, 197 1, abandoned.

Assignee:

U.S. Cl. 426/67; 426/190; 426/191;

426/225; 426/366; 426/477 Int. Cl A231 1/00 Field of Search 426/190, 191, 67, 477,

426/225, 365, 366; 26l/DIG. 7', 423/437, 328; 99/275; 252/455 Z [56] References Cited UNITED STATES PATENTS 2,742,363 4/1956 Hughes 426/366 2,882,244 4/1959 Milton 3,234,028 2/1966 Dunham, Jr 252/455 Z Primary Examiner-S. Leon Bashore Assistant ExaminerPeter Chin 5 7] ABSTRACT 20 Claims, 13 Drawing Figures VOLUMES OF CARBONATION /VOLUME OF WATER PAIENTEUJUHIOIST; .998

SHEET I Fig. 1

EFFECT OF SIEVE PORE SIZE ON CARBONATION Linde Type ISX (I2 gm.)

Linde Type IOX (I2 gm.)

Q8- LInde Type 5A (l2 gm.)

Linde Type 4A (I2 m.) 0.5- g

-Linde Type 3A O.4- (24 gm.)

| l I I I I l I I I l I 2 3 4 5 6 7 8 9 IO Il TIME OF CARBONATION (MINUTES) PATENTEDJUNIO 1975 3,888,888

SHEET 2 PERFORMANCE FACTOR AS A FUNCTION OF PORE SIZE 0.36-

FOUR MINUTE PERFORMANCE FACTOR (P l l 1 l l l l l l l l 2 3 4 5 6 7 8 9 IO SIEVEQPORE SIZE (A) Fig. 2

PATENTEDJUH 10 I975 SHEET Fig. 4

nann Q wank PATENTEDJUH 10 I975 8 888 888 Fig. 10 52 //////4 llllllllllllllllllllllllllllllllllllllllllllIlllHlllllllll 1 BEVERAGE CARBONATION CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of application Ser. No. 200,849, filed Nov. 22, 1971 now abandoned.

BACKGROUND OF THE INVENTION This invention relates to methods, compositions and devices for the carbonation of aqueous beverages at the point of consumption. Carbonation is accomplished by contacting the beverage to be carbonated with molecular sieves, i.e., crystalline aluminosilicates, which contain adsorbed gaseous carbon dioxide. Carbon dioxide is released from such molecular sieves by displacement with water from the beverage solution. The liberated carbon dioxide is then dissolved by the liquid to form the carbonated beverage.

Commercial beverage carbonation usually involves carbon dioxide-liquid contact under pressure with intensive mixing in a cooled container. Such commercial methods, of course, require elaborate and sophisticated equipment not available in the home or at the point of beverage consumption.

Several simple carbonation techniques which are suitable for home use have been disclosed in the art. Most commonly, such prior art carbonation systems utilize a chemical couple to generate carbon dioxide in situ within the beverage to be carbonated. Such a couple ususlly consists of the combination of an inorganic carbonate such as sodium bicarbonate and an ed- 7 ible food acid such as citric acid or an acid-acting ionic exchange resin. Contact between compounds of this type in aqueous solution results in the formation of gas eous carbon dioxide and a salt of the food acid. Several patents (Mitchell, et al., U.S. Pat. No. 3,241,977, Mar. 22, 1966; Mitchell, et al., U.S. Pat. No. 3,467,526, Sept. 16, 1969; Hovey, U.S. Pat. No. 3,492,671, Jan. 27, 1970; and Hughes, U.S. Pat. No. 2,742,363, Apr. 17, 1956) describe preferred embodiments of such acid-bicarbonate or acid resin-bicarbonate systems in detail. All of these methods, however, result in formation of undesirable off-tasting organic salts in solution or require utilization of complex ion exhange material to prevent these salts from dissolving in the beverage. Such salts are particularly noticeable and objectionable to the consumer when formed in substantial amounts in achieving relatively high levels of carbonation.

Another home carbonation technique utilizes dry beverage compositions containing water-reactive carbonic acid anhydrides which release CO or H CO in aqueous solution. (Feldman, et al., U.S. Pat. No. 3,441,417, Apr. 29, 1969) These compositions, however, require rather complex formulation and, in many instances, require incorporation of a buffering system into the beverage solution.

Accordingly, it is an object of the present invention to provide a simple method for beverage carbonation which can be employed in the home or at the point of consumption. It is a further object of the instant invention to provide such a simple carbonation method which does not result in undesirable build-up of offtasting organic salts in solution. It is a further object of the present invention to provide such a beveragecarbonation method which does not necessitate formulation of complex dry carbonation compositions. It is further object of the instant invention to provide simple but effective-devices for point-of-consumption beverage carbonation.

It has now been discovered that by employing readily available molecular sieves which contain adsorbed carbon dioxide and which readily release such carbon dioxide upon contact with water, the above-described objectives can be accomplished.

SUMMARY OF THE INVENTION The instant invention provides methods, compositions and devices for making carbonated beverages in the home. In general such methods comprise contacting a beverage liquid with an effective amount of a crystalline aluminosilicate molecular sieve material having adsorbed therein at least about 5% by weight of carbon dioxide. Such carbonation takes place at a temperature below about 1 10F and at a pressure at least about one atmosphere. Compositions and devices particularly useful when effectuating such molecular sieve carbonation are also provided.

DESCRIPTION OF THE DRAWINGS Although the specification concludes with claims particularly pointing out and distinctly claiming the subject matter forming the present invention, it is believed that the same will be better understood by reference to the following specification taken in connection with the accompanying drawings in which:

FIG. 1 is a graph which demonstrates the effect of molecular sieve pore size on carbonation of water. The horizontal axis represents carbonation time in minutes. The vertical axis represents a unitless measure of dissolved carbon dioxide expressed as the volume of gaseous carbon dioxide (at 32F. and 1 atmosphere) dissolved per volume of carbonated liquid (at 35F. and 1 atmosphere). The five curves are carbonation profiles at 35F and one atmosphere obtained from five different types of molecular sieves which are presently available commercially from the MOlecular Sieve Department of the Material Sciences Division (formerly the Linde Division) of the Union Carbide Corporation.

FIG. 2 is -a graph which demonstrates four-minute carbonation performance factors as a function of mo lecular sieve pore size. The horizontal axis represents molecular sieve pore size in Angstroms. The vertical axis represents four-minute carbonation performance factors, a performance factor being a unitless number defined as:

[(Volume of CO dissolved after four minutes/- (Volume of CO dissolved at saturateion)] X [(Volume of CO dissolved after four minutes/(Volume of CO available within the sieves used)] The two curves represent 12 gram and 24 gram batches of molecular sieves which were used to carbonate eight fluid ounces of water at 35F and one atmosphere.

FIG. 3 is a perspective view of a teabag type of beverage carbonation device.

FIG. 4 is a perspective view of a swizzle stick or structured teabag type of carbonation device.

FIG. 5 is a partial cutaway perspective view of a drinking vessel which can be used to prepare a carbonated beverage.

. FIG. 6 is a cutaway perspective view of another type of drinking vessel which can be used to prepare a carbonated beverage.

FIG. 7 is an elevational view of a sealed flexible carbonation chamber device which upon opening can be used to prepare a carbonated beverage.

FIG. 8 is a vertical cross-sectional view of the sealed carbonation chamber of FIG. 7.

FIG. 9 is a perspective view of the flexible carbonation chamber of FIGS. 7 and 8 opened and ready for preparation of a carbonated beverage.

FIG. 10 is an elevational view of a two compartmented bag carbonation device of the present invention.

FIG. 11 is a perspective view of another carbonation device of the present invention.

FIG. 12 is a vertical cross-sectional view of a collapsible container/carbonation device of the present invention in the collapsed form.

FIG. 13 is an elevational view of the container of FIG. 12 in the in-use position.

DETAILED DESCRIPTION OF THE INVENTION The instant invention utilizes carbon dioxidecontaining molecular sieves to effectuate carbonation of an aqueous potable solution. The invention comprises a process for beverage carbonation in this manner and compositions and devices for carrying out this process.

Molecular sieves of the type used in this invention are crystalline aluminosilicate materials of the following general formula:

MgmO.SiO2.3AizO3-DH2O in the salt form, where n is the valence of a metal cation M, M ordinarily is Na or K but may be other cations substituted by exchange, a is the number of moles of alumina and b is the number of moles of water of hydration.

Upon removal of at least some of the water of hydration by heating, the crystalline aluminosilicates become highly porous and are characterized by a series of surface cavities and internal pores which form an interconnecting network of passageways within the crystal. Such dehydrated molecular sieves are often referred to as activated meaning that they are ready to adsorb carbon dioxide. Due to the crystalline nature of such materials, the diameters of the surface cavities and of the internal pores are substantially constant and are of molecular magnitude. For this reason, the crystalline aluminosilicates have found wide use in the separation of materials according to molecular size or configuration, hence the name molecular sieves.

Molecular sieves or crystalline aluminocilicates are also sometimes referred to as crystalline zeolites and are of both natural and synthetic origin. Natural crystalline aluminosilicates exhibiting molecular sieve activity include for example, analcite, paulingite, ptilolite, clinoptilolite, ferrierite, chabazite, gmelinite, levynite, erionite and mordenite.

Since not all of the natural crystalline aluminosilicates are available in abundance, considerable attention has been directed to the production of synthetic equivalents. Two basic types of crystalline aluminosilicate molecular sieves most readily available on a commercial scle have been given the art-recognized designations of Zeolite X and Zeolite A. Other molecular sieves which have been synthesized include Zeolites B, F, G, H, K-G, .l, L, M, K-M, Q, R, S, T, U, Y, and Z.

Zeolite X is described, together with a process for making it, in detail in U.S. Pat. No. 2,882,244, incorporated herein by reference. The general formula for Zeolite X, expressed in terms of mole fractions of oxides, is as follows:

In the formula M represents a metal and n its valence. As noted, the zeolite is activated or made capable of adsorbing certain molecules by the removal of water from the crystal as by heating. Thus the actual number of moles of water present in the crystal will depend upon the degree of dehydration or activation of the crystal.

The metal represented in the formula above by the letter M can be changed by conventional ion exchange techniques. The sodium form of the zeolite X, designated sodium Zeolte X, or simply as a NaX molecular sieve, is the most convenient to manufacture. For this reason the other forms of Zeolite X are usually obtained by the modification of sodium Zeolite X.

A typical formula for sodium Zeolite X is 0.9Na O:Al O :2.5 SiO :6.l H O After activation by heating, at least some of the water is removed from the sodium Zeolite X or other molecular sieve material and it is then ready for use in the instant invention.

The major lines in the X-ray diffraction pattern of so- In obtaining the X-ray diffraction powder patterns, standard techniques are employed. The radiation is the K doublet of copper, and a Geiger counter spectrometer with a strip chart pen recorder is used. The peak heights, I, and the positions as a function of 20 where 0 is the Bragg angle, are read from the spectrometer chart. From these, d (obs), the interplanar spaacing in A., corresponding to the recorded lines is calculated. The X-ray patterns indicate a cubic unit cell of dimensions between 24.5 A. and 25.5 A.

To make sodium Zeolite X reactants are mxied in aqueous solution and held at about C. until the crystals of Zeolite X are formed. Preferably the reactants should be such that in the solution the following ratios by weight prevail:

SiO jAl- O 3 5 Na OISiO 1.2 1.5 H O/Na O 35 60 The manner in which Zeolite X can be obtained is illustrated by the following: 10 grams of NaAlO 32 grams of an aqueous solution containing by weight about 20% Na O and 32% SiO 5.5 grams of NaOH and I35 cubic centimeters of H 0 are mixed and held in an autoclave for 47 hours at about 100C. Crystalline sodium Zeolte X is recovered by filtering the reacted materials and washed with water until the pH of the effluent wash water is between 9 and 12. The crystals are then at least partially dried after which they are ready for use in the instant invention.

Zeolite A is described in detail together with processes for its preparation in US. Pat. No. 2,882,243, incorporated herein by reference. The general formula for Zeolite A, expressed in terms of mole fractions of oxides is as follows:

l.0 O.2 M2 O:AI203:l.85i0.5SIO2:O t 6 H2O In the formula M represents a metal, hydrogen, or ammonium, N the valence of M. The amount of H 0 present in Zeolite A will of course depend on the degree of dehydration of the crystals.

As in the case of Zeolite X and other zeolites, the element or group designated by M in the formula can be changed by conventional ion exchange techniques. Sodium Zeolite A is the most convenient form to prepare, and other forms are usually obtained from it by an exchange of ions in aqueous solutions. A typical formula for sodium Zeolite A is 0.99 Na Ozl.0 Al O :l.85 SiO :5.l H O The removal of at least part of the water, as by heating, would be sufficient to prepare the sodium Zeolite A for use in the instant invention.

Using the techniques by which the X-ray diffraction data for Sodium Zeolite X was obtained, similar data for sodium Zeolite A is obtained and is recorded in Table B.

To make sodium Zeolite A reactants are mixed in aqueous solution and held at about 100C. until crystals of sodium Zeolite A are formed. The reactants should be such that in the solution the following ratios prevail:

SiO /Al O l.2 2.5 Na O/SiO 0.8 3.0 H o/Na O 35 200 An example of the manner in which sodium Zeolite A may be prepared is as follows: 80 grams of NaAlO 126 grams of an aqueous solution of sodium silicate containing about 7.5% by weight Na O and 25.8% by weight SiO and 320 cubic centimeters of H 0 are placed in an autoclave. In the autoclave the following ratios prevail: SiO /Al O 1.2; Na O/SiO 1.2; and H O/Na 36. The contents of the autoclave are held at about 100C. for about 12 hours. Crystalline sodium Zeolite A is recovered by filtration and washed with distilled water until the effluent wash water has a pH of between 9 and 12. After drying and at least partial dehydration the crystals are ready for use in the instant invention.

These and other types of crystalline aluminosilicate molecular sieves useful in the instant invention are described more fully in the following publications incorporated herein by reference: Hersh, Molecular Sieves,

Reinhold Publishing Corporation, 1961; Thomas and Mays, Separations with Molecular Sieves found at pages 45-97 of Physical Methods in Chemical Analysis, Volume IV, edited by Walter G. Berl, Academic Press, 1961; Breck, Crystalline Molecular Sieves," found at page 678 of the Journal of Chemical Education, Volume 41, December, 1964; and Linde Molecular Sieves" a technical publication of the Union Carbide Corporation.

Several specific types of molecular sieves are particularly useful for employment in the instant beverage carbonation process and devices. (In the following description references to molecular sieves by Types" all refer to materials presently available from the Molecular Sieve Department of Union Carbide. Generic designations such as NaA, NaX, CaA, CaX refer respectively to sodium Zeolite A, sodium Zeolite X, calcium Zeolite A, calcium Zeolite X, etc.) These include

Type

4A and 13X molecular sieves. Type 4A (NaA) has a four Angstrom pore size and can be characterized by the chemical formula izl 2)l2( 2)106] 2 Na -[AlO (SiO .276H 0.

With both the

Type

4A and 13X molecular sieves, the sodium ions can be exchanged with other cations, such as potassium and calcium, to provide varying pore sizes and somewhat different adsorption characteristics. For example, the Type 4A molecular sieve having approximately 70% of its sodium cations exchanged for calcium cations yields a molecular sieve marketed commercially by the Union Carbide Corportion as Type 5A (CaA) having a five Angstrom pore size. Likewise, the Type 13X (NaX) molecular sieve having about 70% of its sodium cations exchanged for calcium cations is marketed commercially by the Union Carbide Corporation as the Type lOX (CaX) having an eight Angstrom pore size. Another molecular sieve, the type 3A has a potassium Zeolite A (KA) structure and a three Angstrom pore size.

It is also possible to commercially obtain crystallization aluminosilicate molecular sieves which are classified as acid-resistant. Acid-resistant molecular sieves are crystalline zeolites which do not structurally degrade and from which metal ions are not leached upon prolonged contact with low pH solutions. Such acidresistant molecular sieves are usually prepared by removing or replacing with protons many of the exchangeable metal ions found in natural and synthetic molecular sieves. This is accomplished by first exchanging metal ions with ammonium ions and subsequently heating the resulting ammonium form of such molecular sieves to about 400C. to decompose the ammonium cations. Although the exchangeable metal ions in all crystalline memtal aluminosilicates can be removed or replaced to some extent by this procedure, in most cases complete ion exchange of this type destroys the crystal structure of the zeolite. In order to replace more than 35% of the zeolite metal ions without destroying the aluminosilicate crystal, those zeolites having a slo /A1 molar ratio greater than 3:l are employed in the above-described ion exchange processes. Zeolites having such a high SiO- /Al- O mole ratio include the natural mineral faujasite and the synthetic sodium Zeolite Y (NaY) described more described more fully in U.S. Pat. No. 3,130,007. incorporated herein by reference. Zeolite Y has the general formula (0.9i0.2) Na O.Al O .cSiO .dH O wherein c varies from 3 to 6 and d (before dehydration) is less than or equal to 9. The process for lowering the metal ion content of crystalline metal aluminosilicates is described more fully in U.S. Pat. No. 3,130,006 and 3,460,904 incorporated herein by reference.

Examples of commercially available acid-resistant molecular sieves produced by the metal ion removal process described above include the Type AW-300 molecular sieve which has a four Angstrom pore size, the Type AW-SOO molecular sieve which has a five Angstrom pore size, the Type SK40 (NaY in particulate form with a clay binder) and Type Sk4l (NaY in particulate form) molecular sieves both having a pore size of 81 0 Angstroms and the Zeolon Series 100, 200 and 900, presently marketed by the Norton Company.

Various molecular sieve forms ranging from powder (0.5 12 microns) to A; inch spheres are commercially available, with most of the non-powdered forms incorporating a binder of inert clay at a 20% by weight level. Common sieve forms include extruded 1/16 and /s with diameter pellets and 4 X 8 and 8 X 12 mesh beads, i.e., spheres which will pass through an 8 mesh screen but not through a 12 mesh screen. Molecular sieves may be placed in other molded forms of any size or shape desired with binders of clay or polymeric resins.

For purposes of the instant invention, the material adsorbed within such molecular sieves is, of course, gaseous carbon dioxide. Carbon dioxide is strongly adsorbed on such sieves, but is readily displaced by the stronger and preferably adsorption of water. Hence the release of adsorbed carbon dioxide from molecular sieves in aqueous solution provides basis for the carbonation technique of the instant invention.

Molecular sieves are loaded" with carbon dioxide merely by contacting the activated (i.e., at least partially dehydrated) sieve material with gaseous carbon dioxide under anhydrous conditions to bring about carbon dioxide adsorption. Typically, the sieve materials can be dehydated to about 2% by weight water. Preferably, molecular sieves are charged with carbon dioxide in a packed bed column to which the gas is passed in ambient temperature and at a slight positive pressure (up to 0.5 psig). For use in the instant beverage carbonation process and devices, molecular sieves should be loaded to the extent of at least about by weight (i.e., weight of carbon dioxide adsorbed/weight of loaded sieves X 100%). The extent to which a particular size of sieves, i.e., sieves with a given pore size, adsorb carbon dioxide at any particular temperature or pressure is easily determined by experimentation or by utilization of adsorption data provided for commercially available sieves.

It is important that the carbon dioxide-loaded molecular sieves be packaged and stored in a manner which will prevent contct with atmospheric moisture prior to use in the present invention. Such atmospheric moisture would displace carbon dioxide rendering the sieves ineffective for beverage carbonation.

The carbon dioxide-loaded molecular sieves are contacted with aqueous potable liquid to effectuate the carbonation process for the instant invention. Carbon dioxide is released from the sieves by the preferential adsorption of water from the beverage solution. A carbonated beverage results when this released carbon dioxide is dissolved in the aqueous liquid. Subsequent release of this dissolved carbon dioxide in the mouth upon drinking provides the characteristic feel and taste of a carbonate beverage. Of course, the extent of carbonation increases as more carbon dioxide is dissolved. Carbonation is usually measured in a unit, hereinafter referred to as volumes of dissolved CO or volumes of carbonation defined as the volume of gas (reduced to standard conditions, i.e., 760 mmHg and 32F.) which at the temperature and pressure of carbonation is dissolved in a given volume of beverage.

For purposes of evaluating various molecular sieve carbonation systens, another carbonation indicator known as a performance factor, P can be defined and expressed as the following formula:

wherein A, is an effectiveness factor defined as the ratio (Volume of CO dissolved at n carbonation minutes/- Volume of dissolved CO at saturation) and B is an efficiency factor, defined as the ratio (Volume of CO dissolved at n carbonation minutes/- Total volume of CO available within the sieve used) The performance factor combines the fraction of saturation obtained (effectiveness) with the efficiency of carbonation for a given time period. In the most ideal case, A, would be unity if a saturated solution were generated and greater than unity if supersaturation resulted. B would be unity if all the carbon dioxide present goes into solution. Therefore, the larger the performance factor, the more preferred a given molecular sieve carbonation system is. This performance factor is used to identify and evaluate essential sieve parameters and beverage solution characteristics of the instant invention.

The solubility of carbon dioxide in aqueous solution is strongly a function of temperature and pressure. Solubility data under various temperature and pressure conditions can easily be determined from prior art literature. Thus, certain temperature and pressure limitations apply to the carbonation process of the instant invention. The solubility of carbon dioxide in pure water approaches 0.5 volumes of dissolved CO (a weakly carbonated beverage) at approximately 1 10F. and one atmosphere. Accordingly, carbonation temperatures above F. are not desirable in the practice of the present invention. There is no theoretical lower temperature limit for the instant carbonation process, but there is, of course, the practical lower limit of the freezing point of the particular aqueous beverage solution being carbonated. A highly preferred carbonation temperature is that of an ice-containing beverage mixture, i.e., approximately 32F.

Likewise, beverage carbonation with molecular sieves becomes unacceptably inefficient at carbonation pressures below one atmosphere. Carbonation pressures above one atmosphere enhance carbon dioxide solubility and render molecular sieve beverage carbonation especially effective. In one of its aspects, therefore, the present process encompasses carbonation in closed vessels wherein pressures of up to about 10 atmospheres are developed. From the practical standpoint of in-home or point-of-consumption carbonation, however. atmospheric pressure, i.e., open container carbonation, is preferred in many instances.

Carbonation time is important in many applications but is not a critical variable in the instant carbonation process. Tine of contact of the loaded molecular sieves with beverage liquid will naturally vary with the amount of aqueous solution present; the nature of that solution; the amount, type, and level of charge of the molecular sieves employed; and the strength" of carbonated beverage desired. By employing molecular sieves loaded with carbon dioxide to the extent of at least by weight and by carbonating at temperature and pressure conditions of the present invention, suitably carbonated beverages can be obtained after typical in-home carbonation times (2l5 minutes). Carbonation system providing carbon dioxide release for longer or shorter times than typical can be achieved by utilizing preferred embodiments of the instant invention described hereinafter.

Varying the pore size of the molecular sieves empoloyed in the instant process affects both the carbonation rate and final carbonation level. This is demonstrated by the typical data shown in FIG. I of the drawings. Performance factors at a typical carbonation time (four minutes) generally increase with increasing pore size as illustrated by FIG. 2 of the drawings. The curves of FIGS. 1 and 2 are representative of data obtained from actual sieve tests wherein data were gathered from carbonating eight ounces of cool water at atmospheric pressure with varying weights of 3, 4, 5, 8 and Angstrom pore sized molecular sieves Types 3A, 4A, 5A, 10X and 13X, respectively. Each type of sieve was loaded with carbon dioxide to the maximum extent practical utilizing as received activated sieves; viz., 7.9%, 10.8%, 11.7%, 10.9% and 13.2% by weight respectively. As can be seen the larger sieve types, particularly those of 8-10 Angstom pore size exhibit higher four minute performance (P and consequently are preferred.

As might be expected, increasing the quantity of molecular sieves employed for a given amount of beverage solution increases the quantity of carbon dioxide released, even though carbonation efficiency decreases markedly with an increase in the total amount of molecular sieves present. Although the optimum amount of molecular sieves employed varies with the characteristics of the sieves utilized and the beverage solution to be carbonated, the preferred quantity of molecular sieves ranges from about 0.5 to about 4 grams (before loading) of molecular sieves per fluid ounce of beverage to be carbonated.

The physical shape or form of the molecular sieves employed can also affect beverage carbonation. Powdered molecular sieves are preferably employed in the instant process by molding such sieves into any suitable form which provides a large ratio of surface area to volume. This may be done by employing porous binder systems to mold or extrude the sieves into such shapes as pellets, spheres or thin disks. Processes for bonding or molding molecular sieves into various forms are well known in the art and are disclosed, for example, in US. Pat. Nos. 3,158,597, 3,213,164, British Pat. No.

994,908 and Belgian Pat. No. 627,185, all of which are herewith incorporated by reference.

Mixtures of molecular sieves can be employed to obtain particular carbonation characteristics desired. In general, molecular sieve types having smaller pore sizes (3-5 Angstroms and particularly 3-4 Angstroms) release carbon dioxide upon contact with water more slowly but continue to release it for a longer period of time. Molecular sieves having larger pore openings (greater than 6 Angstroms) provide relatively high initial release rates of carbon dioxide, but such release is not sustained over longer periods of time. The ability of an aqueous solution to dissolve carbon dioxide is inversely related to the degree of saturation thereof. Du ring initial carbonation carbon dioxide can be dissolved at a comparatively high rate while lower rates prevail as the solution approaches saturation. Accordingly, systems wherein both high initial carbon dioxide release and sustained carbon dioxide dissolution are desired can be realized by employing mixtures of sieves having varying pore sizes. A preferred sustainedrelease carbonation process employs a mixture of molecular sieves wherein from 30% to by weight of the sieve mixture consists of sieves having pore sizes from 3 to 5 Angstroms, and preferably 3 to 4 Angstroms, with the balance of the molecular sieves employed having pore sizes from about 6 to 10 Angstroms.

In some applications it may be desirable to use a mixed molecular sieve/chemical couple system. Chemical couples are generally less expensive per volume of released carbon dioxide than are molecular sieves. The off-flavor of the salts from carbon dioxide releasing chemical couples are barely noticeable, if at all, in low levels (which vary with the chemicals in the couple, the flavorings in the beverage and the acuity of the consumer). Typically, about 0.5 to 0.75 volumes of dissolved carbon dioxide (a weakly carbonated beverage) can be achieved in a carbonated cola beverage via a chemical couple without achieving undesirably high levels of (i.e., noticeable off-flavors due to) salts. Consequently a desirable way to achieve carbonation is with a low level of chemical couple carbonation supplemented by molecular sieve carbonation. In such a mixed system, the molecular sieves will preferably be of the smaller pore size variety (i.e., about 3 to 5 Angstroms for slow release) to complement the fast release chemical couple.

The type of beverage solution to be carbonated by the process of the instant invention is not critical. The beverag liquid must, of course, be aqueous in nature.

Such liquids can contain in addition to water, any type of non-interfering flavorant, coloring agent, food additive, medicine, or alcohol. Such materials can alternatively be premixed with carbon dioxide loaded molecular sieves forming compositions which can be used to form flavorful carbonated beverages from tap water. In still another variation, flavorings and colorings can be provided in an aqueous mixture which is added to water along with the carbon dioxide loaded sieves. Examples of the types of beverage which can be made from suitable liquids by carbonation with the present invention include soft drinks, medicinal preparations, beer and sparkling wine.

Certain solutes which might be present in beverage solutions can, however, affect carbon dioxide dissolution, and certain preferred embodiments of the instant invention are particularly useful when such solutes are involved. Although artificial sweeteners such as saccharin and saccharin-containing compositions appear to have little effect on molecular sieve beverage carbonation, various natural sweeteners retard the rate and extent of carbonation from molecular sieves. For example, fructose, sucrose and glucose at levels of typical soft drink beverages noticeably inhibit carbonation of beverages containing them. It has been surprisingly discovered, however, that for carbonation of solutions containing fructose or glucose, Angstrom molecular sieves in the form of 4 X 8 mesh beads provide much better carbonation rate results than with comparable solutions containing sucrose.

The presence of the common food acid components, such as citric acid, up to the level of about 1% appears to have very little effect on the rate or extent of beverage carbonation by molecular sieve techniques. Such food acid-containing drinks, however, necessarily are rather low pH solutions (a 1% aqueous citric acid solution, for example, has a pH of 2). Prolonged contact of such solutions with many synthetic molecular sieve materials will result in gradual leaching of metal ions from the sieve material. As a result the pH of such beverages may rise to the extent that noticeable flavor changes occur. Accordingly when food acid-containing beverage liquids are being carbonated in accordance with the process of the instant invention, it is preferred to utilize acid-resistant molecular sieves described above, i.e., crystalline metal aluminosilicates having an SiO IAI- O molar ratio of at least 3 which have had at least 35% of the exchangeable metal ions removed or replaced with protons.

When carbon dioxide is released quickly in the solution from molecular sieves, it is not generally as efficiently dissolved as when release rates are slower. Slower release rates in general provide better opportunity for gas-liquid contact and therefore promote carbon dioxide dissolution. Dissolution can thus generally be enhanced by utilizing some means for controlling the rate of carbon dioxide release from the molecular sieve material. As noted above, one method of reducing the rate of carbon dioxide displacement by water from molecular sieves resides in employing at least some molecular sieves having pore sizes of from 3 to 5 Angstroms. Another means for controlling and retarding carbon dioxide release rate from molecular sieves comprises coating such sieves with a water-soluble material that impedes water entry into the carbon dioxidecontaining molecular sieve channels as the coating is being dissolved. Any non-toxic, water-soluble coating compound such as polyvinyl alcohol, polyvinyl pyrrolidone, or hydroxypropyl cellulose is suitable. Readily available hydroxypropyl cellulose is the preferred coating.

As noted, carbon dioxide release rate can also be controlled by employing different forms of molecular sieves. Variation in the volume to surface ratio of the aluminosilicate material has a marked effect on carbon dioxide displacement from the molecular sieves. In general sieves having a higher volume to surface area release carbon dioxide more slowly and over a longer time period than sieves having a lower volume to surface ratio.

Carbonation in accordance with the instant invention can, of course, be accomplished by any method of contacting molecular sieves with the beverage liquid. Generally, loaded molecular sieves are placed in a container, and the liquid to be carbonated is then added in sufficient amount to cover the sieves. Unless very fine, impalpable, non-toxic, consumable molecular sieve powder is utilized, carbonation in this manner necessitates separation of the molecular sieve material from the beverage liquid before consumption, This can be done, for example, by filtration, straining, decanting of the beverage or withdrawal of the sieve material from the carbonation vessel. In order to eliminate the need for filtration or straining, several beverage carbonation devices for employing the molecular sieve carbonation process of the instant invention are provided. Each of the devices described can be used with carbon dioxide loaded sieves alone (with a pre-flavored beverage) or in combination with various flavorings and additives (with tap water or the like).

The simplest device for employing the molecular sieve beverage carbonation process of the instant invention comprises a water and gas permeable container in which molecular sieves and, if desired, dry beverage mix, can be enclosed. An overwrap of material substantially impervious to water and water vapor is used to protect this and the other devices illustrated and de' scribed except the embodiments of FIGS. 5-7, 10 and other embodiments which are effectively sealed prior to use. The container is removed from its overwrap and submerged in the beverage to be carbonated with the container preventing the molecular sieve material from being dispersed in the beverage.

Preferably such containers are in the form of a flexible net of inert material, such as cloth, nylon, paper, polyester, fiberglass or any other water-insoluble synthetic polymeric material, having mesh openings large enough to permit substantially unimpeded escape of carbon dioxide bubbles and small enough to retain the molecular sieves (in whatever form utilized) inside the netting. Thus if4 X 8 beads are employed, netting having a mesh size (number of openings per linear inch) greater than 8 must be utilized. Likewise for 8 X 12 beads, netting larger than 12 mesh must be employed. One satisfactory material for this application is the open mesh polymeric netting presently available from Hercules, Inc., under the trademark Delnet.

An example of such a container is shown by FIG. 3 in the drawing. Carbon dioxide-loaded molecular sieves, 1, are enclosed in an open mesh netting, 2, which has been closed by heat-sealing the seams, 3. If desired, colorings and flavorings in dry bead form can also be disposed within such a water and gas permeable container.

Another device for carbonating beverages in accordance with the instant invention comprises a water and gas permeable container of the type described above affixed to a frame and handle assembly so that movement of the molecular sieve-containing, gas-permeable container can be controlled below the surface of the liquid being carbonated. This structured container can then be used to agitate the beverage solution during carbonation, thereby enhancing dissolution of released carbon dioxide. An example of this type of structured swizzle stick is shown by FIG. 4 in the drawing. Open mesh netting, 10, encloses a triangular frame, 11, and contains carbon dioxide-loaded molecular sieves, 12. The netting is sealed by a ring, 13, at the juncture between the triangular frame the stirring handle, 14. Again beads of dry colorings and flavorings can be mixed with the molecular sieves, allowing the formation of a flavorful carbonated beverage from tap water.

Carbonation devices can also be constructed having molecular sieve material comprising an element of a beverage container itself. For example, standard drinking vessels can be employed for this purpose by affixing to the inside surfaces thereof, powdered, pelleted or beaded molecular sieves. Generally, the sieves are dispersed over such area of the inside surfaces as will be contacted by the liquid beverage when the container is filled. By distributing molecular sieves in this manner, carbon dioxide is released into solution in many different places. Carbon dioxide bubbles thus travel through a large volume of liquid, thereby greatly enhancing dissolution in the beverage.

Attachment of sieves can be accomplished by employing any inert insoluble adhesive, such as paraffin or epoxy resins. If the drinking vessel is plastic in nature, sieves can be adhered to the heat-softened inside surfaces of the vessel, to be affixed in place upon cooling. Such drinking vessels can also contain dry beverage mix flavorings and colorings in addition to molecular sieve material, allowing the creation of flavorful carbonated beverages from tap water.

An example of this type of beverage carbonation device is illustrated by FIG. in the drawing. Beads of molecular sieve material, are adhered or anchored to the inside surface, 21, of a drinking cup or container, 22.

Molecular sieves can also be affixed directly to drinking vessels by first molding the sieve material into solid forms which fit the contour of the vessels and which, when affixed to the inside of the vessels, present their surface area to be covered and contacted by the beverage liquid. Manufacture of such molded sieve forms using inert binders of clay or polymeric resins is known in the art as discussed above. The forms themselves may be attached to the inside surfaces of the drinking vessel by utilizing any inert insoluble adhesive material or by employing as vessels, containers which by their form or shape retain such molded sieve forms in place beneath the surface of the contained beverage. By varying the thickness of the sieve forms between about 0.001 and 3 inches, containers can be manufactured which provide various carbonation rates when filled with liquid. Again, the drinking vessel can also contain dry beverage mix.

An example of this type of carbonation device is shown by FIG. 6 in the drawing. A bonded disc of molecular sieve powder, 30, is placed at the bottom of a flexible drinking container, 31, and held in place by an insoluble adhesive or simply by pressing the disc into the bottom of the conical flexible cup.

Another type of molecular sieve carbonation device comprises an open top carbonation chamber filled with loaded molecular sieves. A screening means is affixed within the carbonation chamber to prevent escape therefrom of the solid molecular sieve particles. Beverage liquid is placed into the carbonation chamber, resulting in carbonation thereof upon contact with the loaded molecular sieves within the chamber. After carbonation is complete, the beverage is consumed or poured from the chamber. The screening means prevents molecular sieve particles and, in some cases, foam from being consumed or decanted with the beverage.

The carbonation chamber can be rigid or flexible and made from any inert, water-insoluble material. If a flexible chamber is employed, support means for holding the chamber during carbonation can also be employed. The chamber can also be sealable for storage and shipping.

The screening means can be constructed of any inert, water-insoluble material. As before, the mesh of the screen can be of any size which will readily pass liquid through but which will block passage of the insoluble molecular sieve particles employed. The screening means can be affixed in the carbonation chamber in any desired position or location. For example the screening means can be used to retain molecular sieve material at the bottom of a drinking vessel or can be placed across the top or mouth of the carbonation chamber.

The carbonation chamber device can contain in addition to carbon dioxide-loaded molecular sieve material a dry beverage mix. If such a beverage mix is employed, only water need be added to the carbonation chamber to produce the flavored, carbonated beverage.

An example of a flexible, sealable carbonation chamber assembly is shown by FIGS. 7, 8 and 9 in the drawing. A flexible watertight bag, 40, is filled with carbondioxide containing molecular sieves, 41, and dry beverage mix, 42. A flexible screen or net, 43, in the form of a circle is affixed with a heat-sealed seam, 44, across the opening of the bag near the top. The edges of the bag above the flexible screen are heat-sealed in another seam, 45, to render the bag airand water-tight for storage. In order to use the carbonation device, the top edge of the closed bag including the heat-sealed seam, 45, is torn off and the bag opened as shown in FIG. 9. The bag is then positioned inside the handled container, 46, with the top edges of the bag being folded over the lip of the handled container. Water is poured through the netting opening of the bag to prepare the carbonated beverage. The beverage can then be poured from the bag and container with the netting acting to screen the spent molecular sieve particles and foam as the beverage is decanted.

FIG. 10 is an elevational view of a package, 50, which can be used in various ways in conjunction with the instant invention. The package will typically be constructed of any suitable flexible water and water vapor impervious material, 51, such as polyethylene, polypropylene or the like which is heat sealed at the top in the region, 52, and at the bottom in the region, 53. A medial transverse seal, 54, divides the package into compartments, 55 and 56. In one application, the package, 50, can contain carbon dioxide loaded molecular sieves in one compartment and a beverage concentrate including flavorings and colorings in the other compartment. Preferably the beverage concentrate will be in liquid form due to the ease with which this form mixes with water. In this application, both compartments of the package, 50, are opened and the contents are placed in a container with a suitable amount of water. The carbonation process, i.e., the generation and migration of bubbles of carbon dioxide provides sufficient agitation to thoroughly mix the resultant beverage when a liquid beverage mix is used. Separation of the spent molecular sieves from the beverage being consumed is effected in any of the aforementioned ways.

In another application, the package, 50, is provided with a medial seal which can be peeled or otherwise opened to place the two

compartments

55 and 56 in communication without destroying the integrity of the material, 51. Known techniques are available for forming such a weak seal. In this execution one compartment contains a fully diluted (i.e., at the correct strength for drinking) uncarbonatcd beverage. The other compartment contains carbon dioxide loaded sieves. (Alternatively the beverage flavorings and colorings can be included in dry form with the molecular sieves.) In either event, opening the medial seam, 54, allows contact between the loaded sieves and water and the consequent carbonation of the beverage. Again a water and gas pervious bag or the like can and preferably will be used to retain the spent sieves. With a suitably designed package, 50, pressure carbonation up to about two atmospheres pressure, with the associated higher levels of dissolved carbon dioxide can be achieved. Also, the convenience of a light weight flexible easily storable container can be made available to the carbonated beverage market without the flavor disadvantages of pure chemical couple systems. Precarbonated beverages, as opposed to point-of-use carbonated beverages cannot be provided in simple flexible packages, of course, due to the tendency of such pre-carbonated beverages to become flat as the carbon dioxide diffuses through the package walls.

FIG. 11 is a perspective view of an alternate carbon ating device, 60, in which a disc, 61, of carbon dioxide loaded molecular sieve material with suitable binder, preferably insoluble, is adhered to or molded around support member, 62, which can be a rod-like member, making the device, 60, an alternate to the swizzle-stick of FIG. 4. Alternatively, the support member can be a flexible member such as a string, allowing the disc, 61, to be placed in the beverage to be carbonated much as a teabag is placed in a cup of tea. With either of these variations, the disc, 61, can also include dry flavorings and colorings as coatings thereon to allow formation of a flavorful carbonated beverage from water.

FIG. 12 is a vertical cross section of another carbonation device of the present invention. The container, 70, is of plastic material and includes a plurality of circumferential pleats, 71, which allow vertical expansion of said container to the in-use configuration shown in FIG. 13. Such a container, 70, encloses a suitable quantity of carbon dioxide loaded molecular sieves, 72, which are preferably in the head or pellet form and, optionally, coloring and flavoring ingredients. For shipment and storage the container, 70, is held in the collapsed form of FIG. 12 by any suitable means such as a plastic shrink-film overwrap.

When it is desired to prepare a carbonated beverage the shrink-film is removed. The pouring spout, 73, is then disengaged from the neck, 74, of the container, 70, (typically a threaded engagement) and removed therefrom along with the overcap, 75. A piece of the aforementioned Delnet material, 76, or any other means for retaining the molecular sieves within the container, 70, covers the inlet to the pouring spout, 73, and preferably is attached thereto.

The liquid to be carbonated (and optionally flavored and colored) is then placed within the container, 70, along with ice if desired. The pressure of the contained beverage forces the pleats, 71, to unfold and the container, 70, to expand to the configuration shown in FIG. 13. The pourspout, 73, overcap, 75, and Delnet material, 76, are then reconnected to the neck, 74, of the container, 70. When the carbonated beverage is ready for consumption, the overcap, 75 (which typi- 16 cally is snap-fit to the pourspout, 73) is removed and the beverage dispensed.

All of the above-described carbonation devices employ an effective amount of crystalline aluminosilicate molecular sieves containing at least 5% by weight of carbon dioxide. Preferably such sieves have a pore size of from about 3 to about 10 Angstroms, and are present to the extent of from about 0.5 to about 4 grams of unloaded molecular sieves per fluid ounce of beverage to be carbonated. Mixtures of sieves having varying pore sizes as described above may also be employed in these carbonation devices.

The following Examples serve to illustrate the beverage carbonation process, compositions and devices of the instant invention. In each of the Examples a sample of a potable aqueous solution is carbonated using molecular sieves charged with carbon dioxide. All of the molecular sieves employed are loaded in a packed bed column through which carbon dioxide is passed at ambient temperature and at a pressure of about 0.5 psig. In the Examples the volume of carbon dioxide actually dissolved in a given liquid sample is determined gravimetrically by driving the carbon dioxide out of solution by heating and carrying it with a nitrogen purge into an absorbing bed of Ascarite, commercially available sodium hydroxide on asbestos.

EXAMPLE I Several 8 fluid ounce samples of pure water were carbonated with molecular sieves of varying pore size. All of the molecular sieves employed were in the form of molded particles incorporating clay binders. Carbonation in every case took place in a 400 ml. beaker held at a temperature of 36i 1F. in an ice bath. The particular type of sieves employed, the extent to which they were charged with carbon dioxide and the amount of sieves employed are summarized in Table 1 below.

Table 1 Average Loading Level Amount Pore Size (Wt. Co /Wt. Loaded Utilized Sieve Type (Angstroms) Sieves X l00%) (Grams) Type 3A 3 8.5 24 Type 4A 4 l2.l l2 Type 5A 5 l3.4 12 Type 10X 8 l4.l l2 Type l3X l0 l5.9 l2

Volumes of carbonation attained after 1, 2, 3, 4, 6, l0 and 20 minutes were measured in separate carbonation runs. The results are the basis of FIG. 1 of the drawings and summarized in Table 2 below.

Table 2 Time of Carbonation (minutes) Volumes of Carbonation 2- Table Commued sults of such carbonatlon are summarized in Table 4 below. Time of Pore Size carbonation Volumes of Table 4 Sieve Type (Angstroms) (minutes) (urbonution 5 2 Volumes of Carbonation 01743 T 10X 8 l L210 (Minutes) 6 gm batch 12 gm batch 24 gm batch 2 1.230 4 L1 0 1 0.77 1.10 1.40 6 L130 10 2 0.91 L32 1.54 [Q [200 4 0.99 1.32 1.95 13x 10 1 L30 6 0.98 1.47 1.37 2 1 10 0.95 1.47 1.77 4 1.38 10 1.31

EXAMPLE IV Substantially similar carbonation results are obtained Type X 12 beads welie again employed to When in Exampe I the Type 4A molecular sieves are bonate water in accordance with the procedures of Exreplaced with the acid resistam Type Aw 300 molecw ample III. Four minute effectiveness factors, efficiency lar sieves and the Type 5A molecular sieves are gactors, antlioperformagce gzlctors wgrp lrlecfordetli forl a placed with the acid-resistant Type AU-500 molecular gram m a 3"? a C 0 m0 ecu at sieves sieves loaded with carbon dioxide to the extent of 15.9% by weight. These results are summarized in Table 5 below.

Table 5 Comparison of Four-Minute Performance Factors For Various Batch Quantities of 8

X

12, 13X Beads Quantity Per Unit of Solution Quantity (Grams/ Effectiveness Efficiency Performance (Grams) Fluid Ounce) Factor (A4) Factor (B4) Factor (P4) EXAMPLE [1 Examples III and IV demonstrate that even though F t f f t f 12 a d 24 ram more carbon dioxide is released into solution by utilizz ggxgg gii g g i lgl if i Zi g g 5 i g ing larger amounts of sieves, the efficiency of carbon- 8 w 40 were calculated by carrying out water carbonation in therefore Optimized by employing from about 0.75 to accordance with the procedure described in Example 1 5 grams of molecular sieves p fluid Ounce of I above. Molecular sieves in each case were loaded with g carbon dioxide to the extent shown in Table 1 above. Results of such four minute performance factor com- EXAMPLE V pansons are the basis of FIG. 2 of the drawings and are Several form-s Of the Type 13X molecular sieves, he, Summanzed Table 3 below l/l6 inch pellets, /8 inch pellets, 8 X 12 mesh beads, Table 3 and 4 X 8 mesh beads, loaded as shown in Table 6 with carbon dioxide were employed in the carbonation of s v p Size u Minute Performance Factors water in accordance with the procedures of Example I.

12 gram 24 gram Carbonation volumes at l, 2, 4, 6 and 10 minutes (sep- (Aflgstroms) Charged slcves Charged Slaves arate carbonation runs) were determined with the re- 3 0023 sults summarized in Table 6 below. 4 0.075 0.073 5 0.116 0.141 Table 6 8 0.307 0.210 10 0347 Time of Volumes of Carbonation Carbonation l/l6" Va" 8 X 12 4 X 8 EXAMPLE In (minutes) Pellet Pellet Bead Bead Type 13X, 8 X 12 mesh beads loaded with carbon d1-' 5 :22? {3g :32 oxide to the extent of 15.9% by weight were used to 4 1.33 151 L32 L67 carbonate water in accordance with the procedures of 8 1.32 1.1; Example I. Six gram, 12 gram and 24 gram samples 1 were used, and the volumes of carbonation obtained Loaded with 13.2% co were recorded for each sample in separate carbonation runs after 1, 2, 4, 6 and 10 carbonation minutes. Re-

Loaded with 13.77: CO Loaded with l4.87z CO Loaded with 15.2% C0,

Substantially similar carbonation results are obtained when the molecular sieves employed are the powdered form of Type 13X.

Substantially similar carbonation results are obtained when Angstrom acid-resistant molecular sieves having an SiO- Al O molar ratio of about 4 and 40% of the exchangeable metal ions removed or replaced with protons are employed.

EXAMPLE VI The effect of carbonation with a mixture of 4 Angstrom and 10 Angstrom molecular sieves is demonstrated by employing such a mixture in the carbonation of water in accordance with the procedures and CO load levels of Example I. Carbonation profiles are obtained using 24 grams of 4 Angstrom sieves, 24 grams of 10 Angstrom sieves and a mixture of 12 grams of 4 Angstrom sieves and 12 grams of 10 Angstrom sieves, all sieves being in the form of 8 X 12 beads. The resulting carbonation profiles clearly show that the sieve mixture provides greater initial carbon dioxide release and dissolution than the 4 Angstrom sieves but after about 10 minutes of carbonation yields solutions which are more strongly carbonated than those produced from 10 Angstrom sieves alone.

EXAMPLE VII Type l3 molecular sieves in the form of 8 X 12 mesh beads and loaded to the extent of 15.9% by weight with carbon dioxide were utilized to carbonate sweetened solutions to demonstrate the effect on carbonation of dissolved sweeteners in a beverage liquid. A 10% sucrose solution, a 10% fructose solution, a 1.45% artifical sweetener (Poly Sweet R, a saccharin based material, as presently available from the Guardian Chemical Corporation) solution and pure water were carbonated in accordance with the procedures of Example I. Carbonation profiles for these four solutions are summarized below in Table 7.

The above seven examples clearly demonstrate the efficacy of crystalline aluminosilicate molecular sieves for beverage carbonation over a wide variety of sieve sizes, sieve quantities, sieve forms, sieve mixtures, and beverage solutions. The following examples illustrate several of the carbonation devices which can be employed to utilize this wide variety of molecular sieve carbonation techniques.

EXAMPLE VIII A simple molecular sieve carbonation device was constructed as follows and used to prepare a orangeflavored carbonated beverage. Twelve grams of Type 13X molecular sieves in the form of spherical beads having a mesh size of 8 X 12 were loaded with carbon dioxide to the extent of 15.9% by weight and completely enclosed within commercially available open mesh polymeric netting, Type Q225 Delnet, presently manufactured by Hercules, Inc. Such an assembly is illustrated by FIG. 3 in the drawing.

By submerging this carbonation device below the surface of the solution comprising 9.1% by weight of a commercially available orange-flavored beverage powder (as presently sold under the trademark Kool-Aid) and 90.9% by weight of water, for approximately 10 minutes. a carbonated beverage containing about 1.03 volumes of dissolved carbon dioxide was obtained.

EXAMPLE IX A simple carbonation device utilizing carbon dioxide-containing molecular sieves was constructed as follows: Following the procedures of Example VIII, 12 grams of charged Type 13X molecular sieves were enclosed within a Delnet Q225 open mesh netting mounted on a triangular frame as shown by FIG. 4 in the drawings. The structural netting assembly was attached to a handle so that the netting assembly could be held firmly in place with such handle. The enclosed molecular sieves were then held beneath the surface of an orange-flavored beverage solution to effectuate carbon dioxide release. Carbon dioxide dissolution and hence extent of carbonation was enhanced by using the structured netting assembly as a swizzle stick to agitate the liquid while carbon dioxide was evolving through the mesh of the netting assembly. Employment of this device yielded a carbonated beverage having approximately 1.24 volumes of dissolved carbon dioxide after 7 minutes of carbonation time. After 13 minutes of carbonation time a beverage having 1.65 volumes of dissolved carbon dioxide was obtained.

Substantially similar carbonation results are obtained if the Type 13X molecular sieve material is replaced with a crystalline aluminosilicate having a Zeolite Y structure and an 8 to 10 Angstrom pore size.

EXAMPLE X A beverage carbonation device is constructed as follows: A polystyrene container having a volume of approximately 400 ml. if softened by heating. Fivemicron powdered molecular sieves of the Type 13X are adhered to the soft inside surfaces of the plastic container to the extent necessary to cover such inside surfaces. The container is allowed to cool with the hardened plastic anchoring the sieves in place. The entire container is then contacted with carbon dioxide to load the molecular sieve powder to the extent of approximately 20% by weight of the sieves. When beverage liquid to be carbonated is poured into the container over ice, the beverage is carbonated to the extent of about one volume of dissolved carbon dioxide.

Substantially similar carbonation results are obtained when the powdered molecular sieves are replaced with 4 X 8 mesh Type 13X beads which are affixed to the inside surfaces of the drinking vessel as shown by FIG. 5 in the drawing.

EXAMPLE XI A beverage carbonation device is constructed as follows: At the bottom of a cylindrical polystyrene container similar to that described in Example X, there is placed a cylindrical disc molded from powdered Type 13X molecular sieves. This disc is affixed to the bottom of the polystyrene container as shown by FIG. 6 in the drawing. The molded molecular sieve disc is then loaded with carbon dioxide to the extent of approximately 20% by weight of the disc. When beverage liquid is poured into the container, the beverage is carbonated to the extent of about one volume of dissolved carbon dioxide. The flat disc provides high initial carbon dioxide release from the sieve material near its upper surfaces and also provides sustained carbon dioxide release from the sieve material further inside the disc. The initial carbon dioxide release is inhibited if. prior to insertion in the container, the disc is coated with a film of polyvinyl alcohol.

EXAMPLE Xll A tablet made of Type 13X molecular sieves with 20% by weight of a clay binder and pressed into a 1 /2 inch diameter disc weighing 1 1.47 grams when charged with CO (16.04% CO was placed in a 400 ml. beaker containing 8 fluid ounces of water at 35F. After 4 minutes, 1.22 volumes of carbonation were measured.

Carbonation greater than about two volumes can be obtained if carbonation takes place in a closed vessel and the pressure during carbonation is allowed to rise to about three atmospheres.

EXAMPLE XIII A beverage carbonation device was constructed as follows: Forty-eight grams of 8 X 12 mesh Type 13X molecular sieves were loaded to the extent of 16% by weight with carbon dioxide and mixed with 95 grams of a dry orange-flavored beverage mix. This sieve and beverage mix combination was placed in a spouted container having a volume of approximately 1,900 milliliters. A sheet of polymeric netting (Delnet Type Q225 from Hercules, Inc.) was then placed across the spout of the container.

Nine hundred forty-six milliters of water at 36F was placed in the container and the resulting liquid mixture inside was agitated by shaking for about 2 minutes. After beverage formation and carbonation were completed, the carbonated beverage was decanted through the netting. The resulting beverage contained approximately 1.4 volumes of dissolved carbon dioxide. Substantially similar carbonation results are obtained when the carbonation chamber is a flexible bag as shown by FIGS. 7, 8 and 9 in the drawing.

The above Examples Vlll XIII demonstrate carbonation devices which can be employed to carry out the molecular sieve carbonation process of the instant invention.

A variety of dry flavorings, colorings and additives can be mixed with carbon dioxide loaded molecular sieves to form compositions which, when added to water form flavorful carbonated beverages. Such flavorings, colorings and additives are referred to herein as dry beverage mixes. Typical ingredients in dry beverage mixes can include flavorings, either natural or artificial, such as cola, lemon, lime, orange, grape, cherry, root beer, beer, ginger ale, wine tea, coffee, etc.; colorings, particularly when using artificial flavorings, of any suitable nature; sweetening agents, either natural or artificial such as sugars of the glucose, fructose and sucrose (the former two being preferred over the latter due to the aforementioned effect on carbonation rate), saccharin (which exhibits less inhibition of carbonation rates with molecular sieve carbonation than the natural sugars), etc. Various other additives well known in the beverage art such as thickeners and preservatives can also be added.

One highly satisfactory way to provide point-of-use carbonated beverages is to package a composition consisting of carbon dioxide loaded molecular sieves of the hereinbefore described types anda dry beverage mix in the forms and devices herein described or simply in sealed packets for use in reusable pitchers with netting or other separation means at the outlet thereof. Examples of beverages formed from such compositions include the following:

EXAMPLE XlV sieve material. 25

EXAMPLE XV A dry beverage mix consisting of 44 grams of sugar, 2.4 grams of freeze dried coffee solids, 5.15 grams of carmel coloring (Sethness l-ligh Acid Proof 150) and 0.02 grams of a food grade silicone anti-foaming agent is mixed with 49 grams of NaY molecular sieves (in l/l6 inch extruded pellet form) loaded to 12.9% by weight with carbon dioxide and the composition is mixed in 2,100 grams of cool water. A coffee beverage with 1.44 volumes of dissolved carbon dioxide results.

Substantially similar results are obtained if the molecular sieves are coated with a water soluble material such as hydroxypropyl cellulose to allow vigorous mixing to dissolve the coffee while delaying the release of the carbon dioxide until after said mixing.

EXAMPLE XVI Twenty-four grams of a dry beverage mix of the following composition:

95.55% sucrose 2.5% citric acid 0.5% gum arabic 0.5% natural lemon flavor (dehydrated) 0.5% mono and di-glycerides 0.1% soybean and cotton seed oil 0.25% lemon juice dried with corn syrup 0.1% artificial color are mixed with 8 grams of CaY molecular sieves in 4 X 8 mesh bead form which are loaded to 13.5% by weight carbon dioxide. The mixture is added to 8 fluid ounces of water and ice and stirred until the sugar dissolves. A carbonated lemonade beverage with about l.4 volumes of dissolved carbon dioxide results.

Liquid beverage mixes (i.e., concentrates, extracts, syrups, etc.) of various types can also be prepackaged and used with carbon dioxide loaded molecular sieves. Examples of this aspect of the present invention are:

EXAMPLE XVII Four fluid ounces of a commercial cola fountain syrup (Coca Cola) are placed in one compartment of a bag such as that illustrated in FIG. 10. Eighty grams of CaX sieves as 8 X 12 mesh spherical beads are loaded with carbon dioxide to 13.7% by weight, and placed in the other compartment of the bag. The bag is opened and the sieves and syrup are placed in a scltzer bottle of about 20 fluid ounce capacity. Five l X l X 1 inch ice cubes are added. The bottle is filled with water and tightly capped. After about 10 minutes, a carbonated cola beverage with about 3 volumes of dissolved carbon dioxide (at about 2 atmospheres pressure) results.

Dry beverage mixes in suitable quantities can also be used with the above sieve material and seltzer bottle to form carbonated beverages of other types with about 3 volumes of dissolved carbon dioxide.

EXAMPLE XVIII A two compartment bag 6 inches X 10 inches of the type shown in FIG. 10 of the drawings is made of 1 mil polyethylene. 1.5 Grams of a liquid cola flavored concentrate (Felton International Flavors PG-l89), 2.5 grams of carmel coloring (Sethness High Acid Proof 150), 0.8 grams of 80% concentrated phosphoric acid, 1 10 grams of a 30 Baume sugar syrup and 880 grams of water are premixed and placed in one compartment of a bag such as the one illustrated in FIG. 10. Within the bag and on the other side of the weak medial seal, 48 grams of Type 10X sieves in Vs inch diameter extruced pellet form and loaded to 13.4% with carbon dioxide are placed. The medial seal is separated and the bag is stored at 40F. for about four hours. The resulting beverage, carbonated to about 2 volumes of carbon dioxide is served by pouring through an 8 mesh netting.

Many modifications can be made to the present invention as herein described without departing from the spirit and scope thereof and within the following claims.

What is claimed is:

l. A process for carbonating a potable aqueous solution comprising contacting said solution with an effective amount of a porous crystalline zeolite material, said zeolite having adsorbed therein at least about by weight of carbon dioxide, said contact taking place at a temperature below about 1 10F and a pressure of at least about 1 atmosphere.

2. A process in accordance with claim 1 wherein the crystalline zeolite material is selected from the group consisting of Zeolite X, Zeolite Y and Zeolite A and pore sizes of the crystalline zeolite material range from about 3 Angstroms to about 10 Angstroms.

3. A process in accordance with Claim 2 wherein the pore sizes of the crystalline zeolite material range from about 8 Angstroms to about 10 Angstroms.

4. A process in accordance with claim 2 wherein the crystalline zeolite material has an SiO /Al O mole ratio of at least 3 and has at least 35% of the exchangeable metal ions thereof removed or replaced with protons.

5. A process in accordance with claim 2 wherein the aqueous potable liquid is contacted with from about 0.5 to about 4 grams of crystalline zeolite material per fluid ounce of aqueous potable liquid.

6. A process in accordance with claim 5 wherein the crystalline zeolite material is in the form of spherical beads having a mesh size of 8 X 12.

7. A process in accordance with claim 5 wherein the crystalline zeolite material is in the form of spherical beads having a mesh size of 4 X 8.

8. A process in accordance with claim 2 wherein from about 30% to by weight of the crystalline zeolite material has pore sizes of from about 3 Angstroms to about 5 Angstroms, the balance of said crystalline zeolite material having pore sizes of from about 6 Angstroms to about 10 Angstroms.

9. A process in accordance with claim 2 wherein the crystalline zeolite material is coated with a film of a non-toxic, water-soluble compound.

10. A process in accordance with claim 1 wherein said porous crystalline zeolite is supplemented with a chemical carbon dioxide producing couple, said couple being present at levels sufficiently low to avoid noticeable quantities of the salts thereof in said beverage.

11. A process in accordance with claim 10 wherein said couple is sufficient to produce only about 0.5 volurne of dissolved carbon dioxide.

12. A composition for making a flavorful carbonated beverage from tap water or the like comprising a dry beverage mix and an amount effective to carbonate the beverage of a porous crystalline zeolite said porous crystalline zeolite material having adsorbed therein at least about 5% by weight carbon dioxide.

13. The composition of claim 12 wherein the crystalline zeolite material is selected from the group consisting of Zeolite X, Zeolite Y and Zeolite A and pore sizes of the crystalline zeolite material range from about 3 Angstroms to about 10 Angstroms.

14. The composition of claim 13 wherein said crystalline zeolite material is in bead form and at least about 1/16 inch in its smallest dimension.

15. The composition of claim 13 wherein the pore sizes of the crystalline zeolite material range from about 8 Angstroms to about 10 Angstroms.

16. The composition of claim 15 wherein said crystalline zeolite material is in bead form and at least about 1/16 inch in its smallest dimension.

17. The composition of claim 13 wherein the crystalline zeolite material has an SiO /Al O mole ratio of at least 3 and has at least 35% of the exchangeable metal ions thereof removed or replaced with protons.

18. The composition of claim 17 wherein said crystalline zeolite material is in bead form and at least about 1/16 inch in its smallest dimension.

19. The composition of claim 12 wherein said crystalline zeolite material is in the form of a molded disk.

20. The composition of claim 19 wherein said molded disk is held in place in a drinking vessel.

UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3, 888, 998

DATED June 10, 1975 lNV ENTOR(S) Ronald Lee Sampson and David Denzil Whyte It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 3, line 63 "sole" should-be scale Column 4', line 6 "H O" should be H Q Column 5, line 1 "Zeolte" should be Zeolite Column 5, line 62 "H O/Na 36" should be H O/N-a O, 36

Column 7, line 39 "preferably" should be preferential v Column 9, line 9 "Tine" should be Time Column 9, line 20 "system" should be systems Column 9,-

line

2,5 "poloyed" should be ployed Column 9, line 42 "Angstom" should be Angstrom Column 10, line 50 "beverag" should be beverage Column 17, line 21 "AU-500" should be AW--5OO igned and Sealed this [SEAL] Seventh y f Oc'mberm Arresz:

RUTH C. MASON Arresting Officer

Claims

1. A PROCESS FOR CARBONATING A POTABLE AQUEOUS SOLUTION COMPRISING CONTACTING SAID SOLUTION WITH AN EFFECTIVE AMOUNT OF A POROUS CRYSTALLINE ZEOLITE MATERIAL, SAID ZEOLITE HAVING ADSORBED THEREIN AT LEAST ABOUT 5% BY WEIGHT OF CARBON DIOXIDE, SAID CONTACT TAKING PLACE AT A TEMPERATURE BELOW ABOUT 110*F AND A PRESSURE OF AT LEAST ABOUT 1 ATNOSPHERE.

4. A process in accordance with claim 2 wherein the crystalline zeolite material has an SiO2/Al2O3 mole ratio of at least 3 and has at least 35% of the exchangeable metal ions thereof removed or replaced with protons.

8. A process in accordance with claim 2 wherein from about 30% to 70% by weight of the crystalline zeolite material has pore sizes of from about 3 Angstroms to about 5 Angstroms, the balance of said crystalline zeolite material having pore sizes of from about 6 Angstroms to about 10 Angstroms.

11. A process in accordance with claim 10 wherein said couple is sufficient to produce only about 0.5 volume of dissolved carbon dioxide.

17. The composition of claim 13 wherein the crystalline zeolite material has an SiO2/Al2O3 mole ratio of at least 3 and has at least 35% of the exchangeable metal ions thereof removed or rePlaced with protons.