US20070258876A1 - Method for producing tri-calcium phosphate - Google Patents
Method for producing tri-calcium phosphate Download PDFInfo
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- US20070258876A1 US20070258876A1 US11/825,708 US82570807A US2007258876A1 US 20070258876 A1 US20070258876 A1 US 20070258876A1 US 82570807 A US82570807 A US 82570807A US 2007258876 A1 US2007258876 A1 US 2007258876A1
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- Prior art keywords
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- calcium phosphate
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Links
- 235000019731 tricalcium phosphate Nutrition 0.000 title claims abstract description 83
- 239000001506 calcium phosphate Substances 0.000 title claims abstract description 32
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 title claims abstract description 32
- 229910000391 tricalcium phosphate Inorganic materials 0.000 title claims abstract description 32
- 229940078499 tricalcium phosphate Drugs 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 33
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001868 water Inorganic materials 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 17
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 10
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 25
- 239000004615 ingredient Substances 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 5
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims 3
- 238000004064 recycling Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 16
- 238000001035 drying Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 235000013361 beverage Nutrition 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000002036 drum drying Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 235000013882 gravy Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000013599 spices Nutrition 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229940036811 bone meal Drugs 0.000 description 1
- 239000002374 bone meal Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- KIZFHUJKFSNWKO-UHFFFAOYSA-M calcium monohydroxide Chemical compound [Ca]O KIZFHUJKFSNWKO-UHFFFAOYSA-M 0.000 description 1
- 229940069978 calcium supplement Drugs 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 235000010384 tocopherol Nutrition 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21D—TREATMENT, e.g. PRESERVATION, OF FLOUR OR DOUGH, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS; PRESERVATION THEREOF
- A21D2/00—Treatment of flour or dough by adding materials thereto before or during baking
- A21D2/02—Treatment of flour or dough by adding materials thereto before or during baking by adding inorganic substances
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/20—Inorganic substances, e.g. oligoelements
- A23K20/26—Compounds containing phosphorus
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
- A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
- A23L33/16—Inorganic salts, minerals or trace elements
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23P—SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
- A23P10/00—Shaping or working of foodstuffs characterised by the products
- A23P10/40—Shaping or working of foodstuffs characterised by the products free-flowing powder or instant powder, i.e. powder which is reconstituted rapidly when liquid is added
- A23P10/43—Shaping or working of foodstuffs characterised by the products free-flowing powder or instant powder, i.e. powder which is reconstituted rapidly when liquid is added using anti-caking agents or agents improving flowability, added during or after formation of the powder
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
Definitions
- This invention generally relates to tri-calcium phosphate production. More specifically, the present invention utilizes a production method with a spray head in combination with an agitated air dryer system.
- Tri-calcium phosphate is the generic name for precipitated calcium hydroxyapatite.
- High-quality food-grade tri-calcium phosphate (“TCP”) is used as a calcium supplement in products such as cereals, bakery mixes, dry gravy mixes, spice blends, flours, beverages, animal foods and pharmaceuticals.
- TCP is also used as an anti-caking agent in salt substitutes, dry beverage mixes, dry soup mixes, dry gravy mixes, spice blends and other hydroscopic food products that require flow conditioning.
- TCP also serves as a dispersant, a suspension agent for polymerization of styrene, and a ceramic coloring agent.
- TCP slurries are produced by admixing water, hydrated calcium or lime (CaOH), and phosphoric acid in a stainless steel reaction vessel 7 in FIG. 1 .
- a small amount of acetic acid is also added to control the viscosity of the slurry during the reaction and for passage through a surge tank 8 .
- the slurry produced generally has a weight ratio of 72% water and 28% solid TCP.
- the slurry must be dried to remove the moisture.
- the industry standard for removing the moisture is drying the slurry using a combination of steam heated double drum dryers, gas fired flash dryers 12 , and air conveyance in FIG. 2 . More specifically, drying TCP slurry by spreading it over a steam heated 11 double drum dryer 10 has much inefficiency. The granular characteristics, density and moisture content for different marketable TCP products are determined in the drying process. While the prior art drying techniques produce marketable TCP products, several drawbacks make these techniques less desirable. First, the prior art drying systems utilize a large amount of energy to operate. Approximately 3,750 BTU (British Thermal Units) are required to dry enough slurry to produce one pound of TCP at 2% moisture. The double drum dryer 10 employed has a small production capacity which increases production costs.
- the drums have a capacity of approximately 800 lb to 900 lb per hour.
- the double drum drying system generates excessive dust as the dried TCP is scraped from the drums and is dropped into conveyors. The finer particles become airborne and drift onto the surface of the dryer frame, and eventually onto the floor beneath the dryer. This finer material must be collected and disposed of as waste.
- the present invention is a method for producing tri-calcium phosphate.
- the method admixes water, hydrated lime, ascetic acid, and phosphoric acid in a reaction vessel to form a tri-calcium phosphate slurry, and then places the slurry in physical contact with air at a temperature sufficient to evaporate the water in the slurry.
- the TCP slurry mixes with previously dried TCP (0%-2% moisture) to obtain a blended TCP product that has approximately 30% moisture content. This blend then feeds into an agitated air dryer (AGA) as manufactured by International Technology Systems, Inc. of Wisconsin.
- AGA agitated air dryer
- the moisture in the blended TCP evaporates in the AGA dryer by a turbulent stream of heated air.
- the present invention resulted from different locations of slurry sprays relative to the dryer and various types and amounts of insulation placed upon the burner housing and the dryer itself.
- the air temperature at the inlet 5 a of the dryer 5 will vary between 550° F. and 650° F.
- the air temperature at the outlet 5 b of the dryer 5 will vary between 190° F. and 210° F.
- the hot moist air and dried product exit the dryer into a bag house B as in FIGS. 3, 4 .
- the dry product drops to the bottom of the bag house where it splits into two product streams.
- One stream of dried TCP goes to packaging equipment 9 and along a packaging conveyor 9 a .
- Another stream of product returns to the mixing equipment where it re-blends with the TCP slurry 6 .
- the fabric bags operate similar to the bags in a vacuum cleaner.
- the fabric bags allow the hot air to pass through, but not the fine, airborne TCP particles. This system keeps all the TCP contained and eliminates waste.
- the AGA drying system uses approximately 1,500 BTU to produce one pound of TCP product with 2% moisture. This system requires about 40% of the energy used by the double drum drying system 10 .
- the present invention produces approximately 1,650 lb/hr of finished TCP. Furthermore, the temperature, turbulence and velocity of the air stream in the AGA drying system can be readily adjusted to produce various granulations and densities of the TCP to meet the specific requirements of a variety of products.
- One object of the present invention is to provide a new and improved method for producing tri-calcium phosphate.
- Another object of the present invention is to combine the advantages of a spray dryer and an agitated air dryer.
- Another object is to provide a method for producing tri-calcium phosphate that reduces waste of TCP by containing particulate TCP within the equipment.
- Another object is to provide a method for producing tri-calcium phosphate that uses 40% of the energy of prior art methods to operate.
- a still further object is to provide a method for producing tri-calcium phosphate that readily provides TCP of various granulations and densities.
- FIG. 1 is a flow chart illustrating the preferred embodiment of the method of the present invention
- FIG. 2 is a flow chart illustrating the prior art method for producing tri-calcium phosphate
- FIG. 3 is top view of the preferred embodiment of the present invention in a production environment.
- FIG. 4 is a side view of the preferred embodiment of the present invention in a production environment.
- a new and useful method for producing commercial tri-calcium phosphate, or TCP utilizes less water and energy than current methods.
- TCP has a molecular weight of 502 and has the following chemical formula: Ca 5 (PO 4 ) 3 (OH).
- the processes of the present invention produce a TCP product with less energy and less waste than the current methods.
- water 1 , hydrated lime 2 , related ingredients such as acetic acid 4 , and phosphoric acid 3 are admixed in a reaction vessel 7 to form a tri-calcium phosphate slurry 6 .
- the resultant slurry 6 has approximately 72% water and 28% by weight of solid TCP.
- the slurry 6 then physically contacts air to remove the moisture from the slurry 6 .
- the air temperature must reach the evaporation point of the moisture in the slurry 6 .
- the heat of the chemical reaction is controlled to produce TCP having certain characteristics, such as fine particle or powdery form.
- an agitated air or AGA system 5 dries the TCP slurry 6 .
- Suitable AGA systems 5 may be obtained from International Technologies Systems, Inc.
- the agitated air system 5 utilizes a dispersion drum and paddles to separate the TCP slurry 6 into small particles so that a fast moving stream of hot air may remove the moisture in the slurry 6 through evaporation.
- TCP slurry 6 is fed through a spray head 5 c directly upon the dispersion drum of the dryer 5 .
- the dispersion drum has paddles.
- the AGA system 5 has a production capacity of about 1,300 lb to about 2,000 lb per hour, versus about 800 lb to about 900 lb per hour with the prior art dryers. Further, the AGA system 5 works more efficiently at lower moisture levels than current methods.
- a double drum drying system 10 of the prior art, as in FIG. 2 requires high moisture content TCP to distribute TCP evenly upon the surface of the drums. The granular characteristics, density and moisture for different marketable TCP products are determined largely by the dryer shaft speed, air volume and air temperature.
- negative air pressure moves the TCP slurry 6 through the system. This retains the product within the drying equipment. Dust from the production of the TCP remains and returns to the production line P using bag houses B.
- the method of the present invention takes form in a production environment.
- Components are mixed and a slurry forms in the tank 7 .
- slurry 6 is piped to an agitated air dryer 5 .
- the dryer 5 includes one or more spray heads 5 c ahead of the inlet 5 a .
- the particulate TCP exits the dryer through the outlet 5 b and proceeds into the production line P.
- the production line P leads to a baghouse B also connected to a fan F.
- the baghouse B captures particulate TCP, releases air, and collects TCP in bulk.
- a conveyor 9 a takes the bulk TCP into the packaging equipment 9 for further handling such as screening.
- FIG. 4 shows the combination of the dryer and the spray head arranged for production of TCP.
- slurry 6 departs the tank 7 and enters the dryer 5 .
- the TCP proceeds to the baghouse B through the production line P.
- a burner N mounts upon the dryer 5 and communicates heated air for evaporating moisture from the TCP.
- the dryer 5 admits the slurry 6 at the inlet 5 a .
- one or more spray heads 5 c disperse the slurry 6 under pressure upon the drums within the agitated air dryer 5 .
- the particulate TCP is evacuated from the dryer 5 through the outlet 5 b and sent into the production line P.
- the TCP produced using the method of the present invention may be used in various products, including but not limited to, foods, ceramics, bone meal, and beverages.
- the TCP products may also be used in polystyrene manufacturing. From the aforementioned description, a method for producing tri-calcium phosphate has been described. The production method is uniquely capable of drying a TCP slurry.
Abstract
A method for producing tri-calcium phosphate admixes water, hydrated lime, and phosphoric acid in a reaction vessel to form a tri-calcium phosphate slurry. The slurry is then placed in physical contact with heated air through a spray head to evaporate water from the slurry. The preferred embodiment of the method utilizes an agitated air dryer.
Description
- This continuation patent application claims priority from the non-provisional application having Ser. No. 10/950,043 and filed on Sep. 25, 2004, which claims priority from a provisional application having Ser. No. 60/505,397 and filed on Sep. 25, 2003 and which claims priority from a provisional application having Ser. No. 60/505,397 and filed on Dec. 4, 2003.
- This invention generally relates to tri-calcium phosphate production. More specifically, the present invention utilizes a production method with a spray head in combination with an agitated air dryer system.
- Tri-calcium phosphate is the generic name for precipitated calcium hydroxyapatite. High-quality food-grade tri-calcium phosphate (“TCP”) is used as a calcium supplement in products such as cereals, bakery mixes, dry gravy mixes, spice blends, flours, beverages, animal foods and pharmaceuticals. TCP is also used as an anti-caking agent in salt substitutes, dry beverage mixes, dry soup mixes, dry gravy mixes, spice blends and other hydroscopic food products that require flow conditioning. TCP also serves as a dispersant, a suspension agent for polymerization of styrene, and a ceramic coloring agent.
- Currently, TCP slurries are produced by admixing water, hydrated calcium or lime (CaOH), and phosphoric acid in a stainless
steel reaction vessel 7 inFIG. 1 . A small amount of acetic acid is also added to control the viscosity of the slurry during the reaction and for passage through asurge tank 8. The slurry produced generally has a weight ratio of 72% water and 28% solid TCP. To produce a marketable TCP product, the slurry must be dried to remove the moisture. - The industry standard for removing the moisture is drying the slurry using a combination of steam heated double drum dryers, gas fired
flash dryers 12, and air conveyance inFIG. 2 . More specifically, drying TCP slurry by spreading it over a steam heated 11double drum dryer 10 has much inefficiency. The granular characteristics, density and moisture content for different marketable TCP products are determined in the drying process. While the prior art drying techniques produce marketable TCP products, several drawbacks make these techniques less desirable. First, the prior art drying systems utilize a large amount of energy to operate. Approximately 3,750 BTU (British Thermal Units) are required to dry enough slurry to produce one pound of TCP at 2% moisture. Thedouble drum dryer 10 employed has a small production capacity which increases production costs. The drums have a capacity of approximately 800 lb to 900 lb per hour. Finally, the double drum drying system generates excessive dust as the dried TCP is scraped from the drums and is dropped into conveyors. The finer particles become airborne and drift onto the surface of the dryer frame, and eventually onto the floor beneath the dryer. This finer material must be collected and disposed of as waste. - Therefore, an efficient TCP production method is needed that utilizes less water and energy for drying TCP to meet commercial needs.
- The present invention is a method for producing tri-calcium phosphate. The method admixes water, hydrated lime, ascetic acid, and phosphoric acid in a reaction vessel to form a tri-calcium phosphate slurry, and then places the slurry in physical contact with air at a temperature sufficient to evaporate the water in the slurry.
- The TCP slurry mixes with previously dried TCP (0%-2% moisture) to obtain a blended TCP product that has approximately 30% moisture content. This blend then feeds into an agitated air dryer (AGA) as manufactured by International Technology Systems, Inc. of Wisconsin.
- The moisture in the blended TCP evaporates in the AGA dryer by a turbulent stream of heated air. The present invention resulted from different locations of slurry sprays relative to the dryer and various types and amounts of insulation placed upon the burner housing and the dryer itself. The air temperature at the
inlet 5 a of thedryer 5 will vary between 550° F. and 650° F. The air temperature at theoutlet 5 b of thedryer 5 will vary between 190° F. and 210° F. The hot moist air and dried product exit the dryer into a bag house B as inFIGS. 3, 4 . The dry product drops to the bottom of the bag house where it splits into two product streams. One stream of dried TCP goes topackaging equipment 9 and along apackaging conveyor 9 a. Another stream of product returns to the mixing equipment where it re-blends with theTCP slurry 6. - The hot moist air exits through the top of the bag house after passing through fabric bags. The fabric bags operate similar to the bags in a vacuum cleaner. The fabric bags allow the hot air to pass through, but not the fine, airborne TCP particles. This system keeps all the TCP contained and eliminates waste.
- The AGA drying system uses approximately 1,500 BTU to produce one pound of TCP product with 2% moisture. This system requires about 40% of the energy used by the double
drum drying system 10. The present invention produces approximately 1,650 lb/hr of finished TCP. Furthermore, the temperature, turbulence and velocity of the air stream in the AGA drying system can be readily adjusted to produce various granulations and densities of the TCP to meet the specific requirements of a variety of products. - Numerous objects, features and advantages of the present invention will be readily apparent to those of ordinary skill in the art upon a reading of the following detailed description of the presently preferred, but nonetheless illustrative, embodiment of the present invention when taken in conjunction with the accompanying drawings. Before explaining the current embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
- One object of the present invention is to provide a new and improved method for producing tri-calcium phosphate.
- Another object of the present invention is to combine the advantages of a spray dryer and an agitated air dryer.
- Another object is to provide a method for producing tri-calcium phosphate that reduces waste of TCP by containing particulate TCP within the equipment.
- Another object is to provide a method for producing tri-calcium phosphate that uses 40% of the energy of prior art methods to operate.
- A still further object is to provide a method for producing tri-calcium phosphate that readily provides TCP of various granulations and densities.
- These together with other objects of the invention, along with the various features of novelty that characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated a preferred embodiment of the invention.
- Variations and modifications to the subject matter of this invention may occur to those skilled in the art upon review of the development as described herein. Such variations, if within the spirit of this development, are intended to be encompassed within the scope of the invention as described.
-
FIG. 1 is a flow chart illustrating the preferred embodiment of the method of the present invention; -
FIG. 2 is a flow chart illustrating the prior art method for producing tri-calcium phosphate; -
FIG. 3 is top view of the preferred embodiment of the present invention in a production environment; and, -
FIG. 4 is a side view of the preferred embodiment of the present invention in a production environment. - The same reference numerals refer to the same parts throughout the various figures.
- A new and useful method for producing commercial tri-calcium phosphate, or TCP, utilizes less water and energy than current methods. TCP has a molecular weight of 502 and has the following chemical formula: Ca5(PO4)3(OH). The processes of the present invention produce a TCP product with less energy and less waste than the current methods. According to the method of the present invention in
FIG. 1 ,water 1,hydrated lime 2, related ingredients such asacetic acid 4, andphosphoric acid 3 are admixed in areaction vessel 7 to form atri-calcium phosphate slurry 6. Theresultant slurry 6 has approximately 72% water and 28% by weight of solid TCP. Theslurry 6 then physically contacts air to remove the moisture from theslurry 6. To remove the moisture, the air temperature must reach the evaporation point of the moisture in theslurry 6. The heat of the chemical reaction is controlled to produce TCP having certain characteristics, such as fine particle or powdery form. - In the preferred method of the invention, an agitated air or
AGA system 5 dries theTCP slurry 6.Suitable AGA systems 5 may be obtained from International Technologies Systems, Inc. Theagitated air system 5 utilizes a dispersion drum and paddles to separate theTCP slurry 6 into small particles so that a fast moving stream of hot air may remove the moisture in theslurry 6 through evaporation. In the preferred method of the invention,TCP slurry 6 is fed through aspray head 5 c directly upon the dispersion drum of thedryer 5. In an alternate method, the dispersion drum has paddles. In addition, theAGA system 5 has a production capacity of about 1,300 lb to about 2,000 lb per hour, versus about 800 lb to about 900 lb per hour with the prior art dryers. Further, theAGA system 5 works more efficiently at lower moisture levels than current methods. A doubledrum drying system 10 of the prior art, as inFIG. 2 , requires high moisture content TCP to distribute TCP evenly upon the surface of the drums. The granular characteristics, density and moisture for different marketable TCP products are determined largely by the dryer shaft speed, air volume and air temperature. Using theAGA system 5, negative air pressure moves theTCP slurry 6 through the system. This retains the product within the drying equipment. Dust from the production of the TCP remains and returns to the production line P using bag houses B. - Turning to
FIG. 3 , the method of the present invention takes form in a production environment. Components are mixed and a slurry forms in thetank 7. From thetank 7,slurry 6 is piped to anagitated air dryer 5. Thedryer 5 includes one or more spray heads 5 c ahead of theinlet 5 a. As moisture departs theslurry 6, the particulate TCP exits the dryer through theoutlet 5 b and proceeds into the production line P. The production line P leads to a baghouse B also connected to a fan F. As previously described, the baghouse B captures particulate TCP, releases air, and collects TCP in bulk. Aconveyor 9 a takes the bulk TCP into thepackaging equipment 9 for further handling such as screening. -
FIG. 4 shows the combination of the dryer and the spray head arranged for production of TCP. As inFIG. 3 ,slurry 6 departs thetank 7 and enters thedryer 5. Exiting thedryer 5, the TCP proceeds to the baghouse B through the production line P. To heat the air used in thedryer 5, a burner N mounts upon thedryer 5 and communicates heated air for evaporating moisture from the TCP. Thedryer 5 admits theslurry 6 at theinlet 5 a. Inside of theinlet 5 a, one or more spray heads 5 c disperse theslurry 6 under pressure upon the drums within theagitated air dryer 5. As the moisture content declines, the particulate TCP is evacuated from thedryer 5 through theoutlet 5 b and sent into the production line P. - The TCP produced using the method of the present invention may be used in various products, including but not limited to, foods, ceramics, bone meal, and beverages. The TCP products may also be used in polystyrene manufacturing. From the aforementioned description, a method for producing tri-calcium phosphate has been described. The production method is uniquely capable of drying a TCP slurry.
- As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. Therefore, the claims include such equivalent constructions insofar as they do not depart from the spirit and the scope of the present invention.
- It is to be understood that while certain embodiments of the invention are described and illustrated herein, the invention is not to be limited to the specific form or arrangement described and shown herein. It will be apparent to those skilled in the art that various changes may be made without departing from the scope and spirit of the invention, and the invention is not to be considered limited to what is shown and described herein.
Claims (10)
1. A method of producing dry marketable hydroxyapatite, commonly known as tri-calcium phosphate, combined from ingredients including water, hydrated lime, phosphoric acid, and acetic acid, comprising:
forming a slurry from said ingredients including approximately 72% water by weight and approximately 28% tri-calcium phosphate by weight wherein said tri-calcium phosphate attains an initial moisture content of approximately 30%;
adding to said slurry less than 2% by weight acetic acid for controlling the viscosity of said slurry during the reaction of said ingredients during mixing of said slurry;
placing said slurry within heated air produced by an agitated air system having an agitated air dryer with an inlet and an outlet and at least one spray head located between said inlet and said outlet, said at least one spray head directly applying said slurry within an agitated heated air stream within the air dryer;
maintaining the temperature at said inlet of the air dryer of approximately 550° F. to approximately 650° F., and maintaining the temperature of said air outlet at approximately 190° F. to approximately 210° F.;
using negative air pressure within said agitated air system to move said slurry through said air dryer and to direct said slurry through said at least one spray head in contact with the stream of heated air to evaporate water from said slurry to produce a tri-calcium phosphate having a moisture content less than approximately 2%; and,
said method producing tri-calcium phosphate at a rate of at least 1,300 pounds per hour and at less than 1,500 Btu used per pound.
2. The method of claim 1 further comprising:
dividing said tri-calcium phosphate produced by said method into two portions;
recycling one of said portions into the step of forming said slurry; and,
packaging the other of said portions for delivery.
3. The method of claim 1 further comprising:
said air dryer having at least one paddle.
4. The method of claim 1 further comprising:
forming a slurry including approximately 72% by weight water, approximately 11% by weight hydrated lime, approximately 16% by weight phosphoric acid, and less than 1% by weight acetic acid.
5. A method of producing dry marketable hydroxyapatite, commonly known as tri-calcium phosphate, combined from ingredients including water, hydrated lime, and phosphoric acid, comprising:
forming a slurry from said ingredients including approximately 72% water by weight, and approximately 28% hydrated lime and phosphoric acid by weight, said slurry including tri-calcium phosphate of an initial moisture content of approximately 30%;
placing the slurry in contact with heated air produced by an agitated air system having an agitated air dryer with an inlet and an outlet and at least one spray head between said inlet and said outlet, said at least one spray head directly applying said slurry within said agitated heated air stream within the air dryer;
maintaining the inlet of the air dryer at a temperature of approximately 550° F. to approximately 650° F., and maintaining the outlet of the air dryer at a temperature of approximately 190° F. to approximately 210° F.;
using negative air pressure within said agitated air dryer to move said slurry through said dryer and directing said slurry through said at least one spray head in contact with the stream of heated air to evaporate water from said slurry to produce a tri-calcium phosphate having a moisture content of less than approximately 2%;
splitting said tri-calcium phosphate produced by said method into two portions, returning one of said portions into said slurry, and packaging the other of said portions for delivery; and,
said method producing tri-calcium phosphate, at a rate of at least 1,300 pounds per hour and with less than 1,500 Btu used per pound.
6. The method of claim 5 further comprising:
said forming said slurry including less than 2% by weight acetic acid.
7. The method of claim 5 further comprising said air dryer having at least one paddle.
8. The method of claim 5 further comprising:
said forming said slurry including hydrated lime and phosphoric acid in similar proportions by weight.
9. The method of claim 5 further comprising:
said forming said slurry including approximately 11% by weight hydrated lime, approximately 16% by weight phosphoric acid, and less than 1% by weight acetic acid.
10. A method of producing dry marketable hydroxyapatite Ca5(PO4)3(OH), also known in trade as tri-calcium phosphate, comprising:
forming a slurry including approximately 72% by weight water, approximately 11% by weight hydrated lime, approximately 16% by weight phosphoric acid, and approximately 1% by weight acetic acid for controlling the viscosity of said slurry during the reaction of said ingredients during mixing of said slurry, wherein said slurry contains tri-calcium phosphate of a moisture content of approximately 30%;
placing said slurry within heated air produced by an agitated air system having an agitated air dryer with an inlet and an outlet, at least one paddle, and at least one spray head located between said inlet and said outlet, said at least one spray head directly applying said slurry within an agitated heated air stream within the air dryer;
maintaining the temperature at said inlet of the air dryer of approximately 550° F. to approximately 650° F., and maintaining the temperature of said air outlet at approximately 190° F. to approximately 210° F.;
using negative air pressure within said agitated air system to move said slurry through said air dryer and to direct said slurry through said at least one spray head in contact with the stream of heated air to evaporate water from said slurry to produce tri-calcium phosphate exiting said system having a moisture content less than approximately 2%;
said method producing tri-calcium phosphate at a rate of at least 1,300 pounds per hour and at less than 1,500 Btu used per pound; and,
dividing said tri-calcium phosphate produced by said method into two portions wherein one of said portions is recycled into the step of forming said slurry and wherein the other of said portions is packaged for delivery.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/825,708 US20070258876A1 (en) | 2003-12-04 | 2007-07-09 | Method for producing tri-calcium phosphate |
US12/316,101 US7754174B2 (en) | 2003-12-04 | 2008-12-10 | Method for producing tri-calcium phosphate |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US50539703P | 2003-12-04 | 2003-12-04 | |
US10/950,043 US20050123652A1 (en) | 2003-12-04 | 2004-09-25 | Method for producing tri-calcium phosphate |
US11/825,708 US20070258876A1 (en) | 2003-12-04 | 2007-07-09 | Method for producing tri-calcium phosphate |
Related Parent Applications (1)
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US10/950,043 Continuation US20050123652A1 (en) | 2003-12-04 | 2004-09-25 | Method for producing tri-calcium phosphate |
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US12/316,101 Continuation US7754174B2 (en) | 2003-12-04 | 2008-12-10 | Method for producing tri-calcium phosphate |
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US20070258876A1 true US20070258876A1 (en) | 2007-11-08 |
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US10/950,043 Abandoned US20050123652A1 (en) | 2003-12-04 | 2004-09-25 | Method for producing tri-calcium phosphate |
US11/825,708 Abandoned US20070258876A1 (en) | 2003-12-04 | 2007-07-09 | Method for producing tri-calcium phosphate |
US12/316,101 Expired - Fee Related US7754174B2 (en) | 2003-12-04 | 2008-12-10 | Method for producing tri-calcium phosphate |
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US10/950,043 Abandoned US20050123652A1 (en) | 2003-12-04 | 2004-09-25 | Method for producing tri-calcium phosphate |
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US12/316,101 Expired - Fee Related US7754174B2 (en) | 2003-12-04 | 2008-12-10 | Method for producing tri-calcium phosphate |
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AU2007258485B2 (en) * | 2006-06-09 | 2012-02-16 | Innophos, Inc. | Calcium fortification substance for clear beverages |
MY169686A (en) | 2011-01-27 | 2019-05-13 | Sirim Berhad | A method of converting limestone into tri-calcium phosphate and tetra-calcium phosphate powder simultaneously |
CN104147637B (en) * | 2013-05-14 | 2016-01-06 | 中南大学 | A kind of construction method of composite ceramic porcelain body rack surface micro-nano hole |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4274879A (en) * | 1979-03-05 | 1981-06-23 | Tate & Lyle Limited | Synthetic bone ash |
US4849193A (en) * | 1988-05-02 | 1989-07-18 | United States Gypsum Company | Process of preparing hydroxylapatite |
US5082566A (en) * | 1985-09-23 | 1992-01-21 | Toa Nenryo Kogyo Kabushiki Kaisha | Calcium-phosphate type hydroxyapatite for chromatographic separation and process for producing same |
US5858318A (en) * | 1996-11-27 | 1999-01-12 | Luo; Ping | Methods of synthesizing hydroxyapatite powders and bulk materials |
-
2004
- 2004-09-25 US US10/950,043 patent/US20050123652A1/en not_active Abandoned
-
2007
- 2007-07-09 US US11/825,708 patent/US20070258876A1/en not_active Abandoned
-
2008
- 2008-12-10 US US12/316,101 patent/US7754174B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4274879A (en) * | 1979-03-05 | 1981-06-23 | Tate & Lyle Limited | Synthetic bone ash |
US5082566A (en) * | 1985-09-23 | 1992-01-21 | Toa Nenryo Kogyo Kabushiki Kaisha | Calcium-phosphate type hydroxyapatite for chromatographic separation and process for producing same |
US4849193A (en) * | 1988-05-02 | 1989-07-18 | United States Gypsum Company | Process of preparing hydroxylapatite |
US5858318A (en) * | 1996-11-27 | 1999-01-12 | Luo; Ping | Methods of synthesizing hydroxyapatite powders and bulk materials |
Also Published As
Publication number | Publication date |
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US7754174B2 (en) | 2010-07-13 |
US20090092533A1 (en) | 2009-04-09 |
US20050123652A1 (en) | 2005-06-09 |
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