US2468163A - Processes for preventing corrosion and corrosion inhibitors - Google Patents
Processes for preventing corrosion and corrosion inhibitors Download PDFInfo
- Publication number
- US2468163A US2468163A US1656A US165648A US2468163A US 2468163 A US2468163 A US 2468163A US 1656 A US1656 A US 1656A US 165648 A US165648 A US 165648A US 2468163 A US2468163 A US 2468163A
- Authority
- US
- United States
- Prior art keywords
- corrosion
- imidazoline
- carbon atoms
- group
- aliphatic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M1/00—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants
- C10M1/08—Liquid compositions essentially based on mineral lubricating oils or fatty oils; Their use as lubricants with additives
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
- C10M2215/224—Imidazoles
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/26—Amines
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/046—Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/06—Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/939—Corrosion inhibitor
Definitions
- This invention relates to the inhibition of corrosion of metals, and particularly to a composition for use in preventing corrosion of metals and particularly iron, steel, and ferrous alloys.
- the corrosion inhibitors contemplated herein find special utility in the prevention of corrosion of pipe or equipment which is in contact with a corrosive oil-containing medium, as, for example, in oil wells producing corrosive oil or oil-brine mixtures, in refineries, and the like.
- Our inhibitors may, however, be used in other systems They appear to possess properties which impart to metals resistance to attack by a, variety of corrosive agents, such as brines, weak inorganic acids, organic acids, CO2, HzS, etc.
- R and R is an aliphatic or cycloaliphatic hydrocarbon group containing from 8 to 32 carbon atoms and otherwise may be hydrogen or a, hydrocarbon radical; and D is a divalent organic radical.
- D will be a relatively small organic radical, such as in the following examples of the grouping DR':
- n is the numeral 1 to 6 and R is hydrogen or an aliphatic or cycloaliphatic hydrocarbon radical.
- the group R may be directly attached to the l-nitrogen atom of the ring, as follows:
- R and R have their previous meanings, and m'is a small number, usually less than 6.
- U. S. patents U. S. No. 1,999,989, dated Apr. 30, 1935, Max Bockmuhl at 8.1.; U. S. No. 2,155,877, dated Apr. 25, 1939, Edmund Waldmann et al.; and U. S. No. 2,155,878, dated Apr. 25, 1939, Edmund Waldmann et al. Also see Chem. Rev., 32, 47 (43).
- the resulting imidazoline will contain a Z-substituent consisting of an aliphatic hydrocarbon radical containing 8 or more carbon atoms.
- Suitable corrosion-preventive reagents may, therefore, be made directly by reaction of acids such as oleic acid, linoleic acid, linolenic acid, erucic acid, talloil fatty acids, naphthenic acids, nonoic acid, and the like, with suitable amines such as those enumerated above. when this condensation is carried out at a temperature of 250? 0. or higher,
- the nitrogen atoms are no longer equivalent;
- the nitro- I 'ge'n'atom to which the: radical X is attached will be called the l-nitrogen atom of the imidazoline I ring. This. is in conformance with the usual chemical convention in numbering heterocyclic ring positions.
- imidazoline' compounds in which the higher molecular weight hydrocarbon radical occurs as a portion of the nitrogen atom substituent are also readily prepared by methods analogous to those already described. In this case, however, a number of alternative procedures are possible. For example, one may prepare 2-methy1, l-(octadecylaminoethyl-) imidazoline by reaction of octadecyl aminoethylethylenediamine with acetic acid at a temperature of 250 to 300 C. until two moles of water are evolved for every mole of acetic acid employed.
- the same reagent may result by the preparation of 2-methy1, l-aminoethyl imidazoline followed by alkylation with octadecyl bromide and separation of resulting alkylation products to isolate the desired product.
- 1,2-substituted imidazolines see King & McMillan, J. A. C. S. 68, 1774 (1946); Kyrides et al., J. Organic Chem. 12, 577 (1947).
- N- Hg z-undecylimldazoline This is supposed, on theo- N-CH1 CnHmC z-heptadecylimida'zoline N-CHg (3) CuHai-O 1 15 2.-pentadecyl,- l-heptylimidazoline N-CH] CaHn- 7 J H OH 2-octyl, l-hydroxyethylimidnzoline NCH CoHn.C
- imidazoline containing basic nitrogen groups in addition to those occurring in'the imidazoline ring are particularly efiective corrosion inhibitors.
- Such products are readily prepared from the commercially available polyethylene polyaznines, or from polyamines in which there are three or more ami- (3) CHLC L N- H2- 1H LNH.
- CgHnNH. C "Ha 2-methyl, l-hexadecylaminoethylaminoethyllmidazoline' -om (4) N- H; v ;H.NH.C1:H1
- the corrosion preventive products of the present invention since they contain an imida- 3 Y obtain equally suitable derivatives of imidazolines which may be employed in the present process.
- the corrosion inhibitors of our process may, in many instances, employ these compounds in the form of their salts, either with organic or inorganic acids. Being relatively strong bases. the imidazolines readily form such salts, and where the reagent contains basic groups in addition to the imidazoline ring nitrogen atoms, they may form dior polysalts.
- acids which may be used to form such salts are hydrochloric acid, sulfuric acid, acetic acid, oxalic acid, maleic acid, oleic acid, abietic acid, phosphoric acid, petroleum sulphonic acid, naphthenic acid, ricligsin, phenylacetic acid, benzoic acid, and the l e.
- Salts of the imidazolines may, in general, be alkylated to form either a l-alkyl-substituted imidazoline, or a quaternary ammonium salt, where the alkyl group is attached to either or both the 1 and 3 I nitrogen atoms.
- cetyl bro mide as a typical alkylating agent, the following reactions may be carried out:
- alkylating' agents such as methyl bromide, benzyl chloride, ethyl suliate, dichloroethyl ether, chloroparafiln, etc., to
- reagent compounds containing two or more heterocyclic rings such as two imidazoline rings may be employed.
- two heterocyclic rings such as two imidazoline rings
- solvent The selection of solvent will depend much upon the exact reagent being used and its solubility characteristics. It is also generally desirable to employ a solvent which will yield a solution of low products with solubilities similar to the hydrocarv bon derivativeythey do not diiier greatly in behavior from the corresponding hydrocarbon derivative. 4 a
- Imidazolines containing a relatively high molecular weight hydrocarbon radical, and substituted in the 4- and/or 5- ring positions are also effective inhibitors, but are'not so readily prepared from presently available commercial reagents. 1
- the method of carrying out our process is relatively simple in principle.
- the corrosion preventive reagent is dissolved in the liquid corrosive medium in small amounts and is thus kept in contact with the metal surface to be protected.
- the corrosion inhibitor may be applied first to the metal surface, either as is, or as a solution in some carrier liquid or paste. Continuous application, as in the corrosive solution, is the preferred method, however.
- the present process finds particular utility in the protection of metal equipment of oil and gas day.
- the brine contained 2.75% chlorides as wells, especially those containing or producing.
- the reagent either undiluted or-dissolved in a suitable solvent, is fed down the annulus of the well. between the casing and producing tubular where it becomes commingled with the fluid in the well and is pumped or flowed. from the well with these fluids, thus contacting the inner wall of the casing, the outer and inner wall of tubing, and the innersurface of all wellhead fittings, connections and flow lines handling the corrosive
- the inhibitor composition is a liquid, it is conventionally fed into the well annulus by means of a motor driven chemical injector pump, or it may be dumped periodically (e.
- the reagent may be introduced into the tubing through a pressure equalizing vessel, after stopping the flow of fluids. After being so treated, the well should be left closed in for a period of time suflicient to permit the re-' agent to drop to the bottom of the well.
- solid sticks or plugs of inhibitor is especially convenient.
- These may be prepared by blending the inhibitor with a mineral wax, asphalt or resin in a proportion sufiicient to give a moderately hard and high-melting solid which can be handled and fed into the well conveniently.
- the amount of corrosion preventive agent required in our process varies with the corrosiveness of the-system, but where a continuous or semi-continuous treating procedure is carried out as described above, the addition of reagent in the proportion of from one part per 1,000 to one part per 20,000 or more parts of corrosive fluid will generally provide protection.
- treating procedure and results the following actual well-treatment history is presented.
- Treatment was made of a West Texas oil well producing 15 bbls. of oil and 1 bbl. of brine per NaCl, and 275 parts per million of hydrogen sulfide.
- a solution 'of 2-heptadecylimidazoline in aromatic "naphtha was pumped continuously down the annulus of the well at such a rate that one part of imidazoline was introduced per 8,000
- a process for preventing corrosion of metals comprising the step of applying to such metals a substituted imidazoline selected from the class consisting of:
- D represents a divalent, non-amino, organic radical containing less than carbon atoms, composed of elements from the group consisting of C. H, O, and N
- D represents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C. H, O, and N, and containing at least one amino group
- R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals a substituted imidazoline selected from the class consistin of:
- R is a member of the class consisting of hydrogen and aliphatic and cyclo aliphatic hydrocarbon radicals; with the proviso 12 that at least one occurrence of R contains 8 to 32 carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals a substituted imidazoline selected from the class consisting of:
- D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N
- D represents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group
- R is a member of the class consisting. of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of It contains 10 to 20 carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals a substituted imidazoline of the following formula:
- R is a member of the class consisting P of aliphatic and cycloaliphatic hydrocarbon radimetals a substituted imidazoline of the following in which R is ,an aliphatic hydrocarbon radical containing from 10 to 20 carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals 2-heptadecenylimidazoline.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals a substituted imidazoline of the following formula:
- R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrenceof R contains 10 to 20 carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to'such metals a substituted imidazoline of the following formula:
- R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hy- I N-CH;
- R-C- l A ⁇ N- H ⁇ R in which D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N; and R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains to carbon atoms.
- a process for preventing corrosion of ferrous metals comprising the step of applying to such metals a substituted imidazoline of the forin which D represents a divalent, non-amino, organic radical containing less than carbon atoms, composed of elements from the group consisting of C, H, O, and N; and R is an aliphatic hydrocarbon radical having from 10 to 20 carbon a oms.
- a process for preventing corrosion of oil and gas well equipment comprising the step of injecting into the well as substituted imidazoline selected from the class of:
- D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N; 13' repre ents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group; and R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals: with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
- a process for preventing corrosion of oil and gas well equipment comprising the step ofinjecting into the well a substituted imidazoline of the following formula:
- a process for preventing corrosion of oil and gas well equipment comprising the step of injecting into the well as substituted imidazoline of the following formula:
- R is a member of the class consisting of' hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso thatat least one occurrence of R contains '10 to 20 carbon atoms.
- a process for preventing corrosion of oil and gas well equipment comprising the step of injecting into the well as substituted imidazoline of the formula:
- D' represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, 0, and N; D represents a divalent,
- organic radical containing less than 25 carbon atoms composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group
- audit is a member of the class consisting of hydrogen and-aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
Description
- or applications.
Patented Apr. 26,1949
Charles M. Blair,-Jr., Webster Groves, and William F. Gross, Glencoe, Mo., assignors to Petrolite Corporation, Ltd., Wilmington, Del., a corporation of Delaware No Drawing. Application January 10, 1948,
Serial No. 1,656
16 Claims. (c1. 252--8.55)
This invention relates to the inhibition of corrosion of metals, and particularly to a composition for use in preventing corrosion of metals and particularly iron, steel, and ferrous alloys. The corrosion inhibitors contemplated herein find special utility in the prevention of corrosion of pipe or equipment which is in contact with a corrosive oil-containing medium, as, for example, in oil wells producing corrosive oil or oil-brine mixtures, in refineries, and the like. Our inhibitors may, however, be used in other systems They appear to possess properties which impart to metals resistance to attack by a, variety of corrosive agents, such as brines, weak inorganic acids, organic acids, CO2, HzS, etc.
Compounds which we have found to be effective for the purpose described above belong to the generalclass of cyclic amidines, and in particular are substituted imidazolines, in which the imidazoline molecule contains at least one aliphatic, or cycloaliphatic hydrocarbon group containing from 8 to 32 carbon atoms. Cyclic imidazolines in which the 2-carbon atom is substituted by a long chain aliphatic hydrocarbon group are particularly easy to prepare and are very eiiective for the present use. However, it has in which either R or X, or both, contain or consist of an aliphatic or. cycloaliphatic radical containing from 8 to 32'carbon atoms.
In the most general classification of reagents suitable for our process, the symbol X may include another imidazoli'ne ring, as described more fully below. Shown in the most general way, the compounds contemplated for use herein may be represented by the following formula:
where at least one of the groups R and R is an aliphatic or cycloaliphatic hydrocarbon group containing from 8 to 32 carbon atoms and otherwise may be hydrogen or a, hydrocarbon radical; and D is a divalent organic radical. In the more common reagents, D will be a relatively small organic radical, such as in the following examples of the grouping DR':
C.HzO
C,.Il;..-NR'C.H1.NR'- -C Hm-NlV-C n h NR n Zn N -o,.H,,.N N-D- HgHg Where n is the numeral 1 to 6 and R is hydrogen or an aliphatic or cycloaliphatic hydrocarbon radical.
In the simplest case, the group R may be directly attached to the l-nitrogen atom of the ring, as follows:
We have found that particularly outstanding corrosion-preventive reagents result when the imidazoline compound contains basic nitrogen groups inaddition to those inherently present in the imidazoline-ring. In general, compounds of 0 this type which are effective are those in which the basic nitrogen group is contained in the radicalD in the above formula.
In this case the products may be represented by the-formula:
N-CH,
Of this class of reagents inwhich an amino groupoccurs asa portionoi the l-nitrogen subevolved and the desired imidazoline is formed inalmost quantitative yield. Such suitable reagents may be representedby the following formula:
than, A-o
wherexmay be ethylene amino radicals, hydroxyethylamino radicals, aminoalkyl radicals, alkyleneoxyalkyl radicals, hydrogen hydrocarbon radicals, cyclo'aliphatlc' or aliphatic hydrocarbon radicals or another imidazoline group: and where A is an aliphatic or cycloaliphatic hydrocarbon radical having from 8 to 32 carbon atoms; In the above formulas for imidazolines it should be pointed out that where X is a hydrogen atom, the
nitrogen atoms become equivalent, insofar as re- 2o where R and R have their previous signific'ancestituent, those which are derived, at least theo I retically, from the polyethylene polyamines appear tobe particularly. effective as corrosion inhibitors and are so outstandingas to constitute an invention within an invention. These have the general formula:
where R and R have their previous meanings, and m'is a small number, usually less than 6.
Q The preparation of an imidazoline substituted in the 2-position by aliphatic hydrocarbon radicals is well described in the literature and is readily carried out by reaction between a mono-carboxylic acid and a diamine, or polyamine, containing at least one primary amino group, and at least one secondary amino group, or another primary amino group separated from the first primary amino group by two carbon atoms. Examples of suitable polyamines which can be employed for this conventional imidazoline synthesis include ethylenediamine, diethylenetriamine, triethylenetetramine, ,tetraethylenepentamine, 1,2-diaminopropane, N-ethylethylenediamine, N,N-dibutyldiethylenetriamine, 1,2-diaminobutane, hydroxyethylethylenedlamine, dipropylenediamine and the like. For details of the preparation of these reagents see the following U. S. patents: U. S. No. 1,999,989, dated Apr. 30, 1935, Max Bockmuhl at 8.1.; U. S. No. 2,155,877, dated Apr. 25, 1939, Edmund Waldmann et al.; and U. S. No. 2,155,878, dated Apr. 25, 1939, Edmund Waldmann et al. Also see Chem. Rev., 32, 47 (43).
When an aliphatic or cycloaliphatic carboxylic' acid containing 9 or more carbon atoms is employed in the above described synthesis, the resulting imidazoline will contain a Z-substituent consisting of an aliphatic hydrocarbon radical containing 8 or more carbon atoms. Suitable corrosion-preventive reagents may, therefore, be made directly by reaction of acids such as oleic acid, linoleic acid, linolenic acid, erucic acid, talloil fatty acids, naphthenic acids, nonoic acid, and the like, with suitable amines such as those enumerated above. when this condensation is carried out at a temperature of 250? 0. or higher,
action is concerned, and cannot be distinguished from one another. reti'cal grounds, to-resultzfrom. the mobility of the hydrogen proton, and its ease of transfer from one nitrogen atom to the other. However, where X is anorganic substituentother than hydrogen,
the nitrogen atoms are no longer equivalent; For I the purpose of the present application, the nitro- I 'ge'n'atom to which the: radical X is attached will be called the l-nitrogen atom of the imidazoline I ring. This. is in conformance with the usual chemical convention in numbering heterocyclic ring positions.
As mentioned above, we have discovered that equally suitable corrosion-preventive reagents may be obtained byintroducing into the imidazoline compound an aliphatic hydrocarbon group of proper size as a portion of the substituent attached to the l-nitrogen atom of the imidazoline ring. Where the aliphatic hydrocarbon group occurs in this position, it is unnecessary that the z-carbon atom substituent contains 8 or more carbon atoms. It may be, in fact, only a hydrogen atom or a methyl group, ethyl group,
phenyl group, or other relatively small hydrocarbon group, although it is not restricted to such small groups. The preparation of imidazoline' compounds in which the higher molecular weight hydrocarbon radical occurs as a portion of the nitrogen atom substituent, are also readily prepared by methods analogous to those already described. In this case, however, a number of alternative procedures are possible. For example, one may prepare 2-methy1, l-(octadecylaminoethyl-) imidazoline by reaction of octadecyl aminoethylethylenediamine with acetic acid at a temperature of 250 to 300 C. until two moles of water are evolved for every mole of acetic acid employed. The same reagent may result by the preparation of 2-methy1, l-aminoethyl imidazoline followed by alkylation with octadecyl bromide and separation of resulting alkylation products to isolate the desired product. For the preparation of 1,2-substituted imidazolines, see King & McMillan, J. A. C. S. 68, 1774 (1946); Kyrides et al., J. Organic Chem. 12, 577 (1947).
Examples of suitable substituted imidazolines in which the aliphatic or cycloaliphatic group containing from 8 to 32 carbon atoms is a 2- position substituent, are as follows:
N-CH:
CuHnC (1) N- Hg z-undecylimldazoline This is supposed, on theo- N-CH1 CnHmC z-heptadecylimida'zoline N-CHg (3) CuHai-O 1 15 2.-pentadecyl,- l-heptylimidazoline N-CH] CaHn- 7 J H OH 2-octyl, l-hydroxyethylimidnzoline NCH CoHn.C
2-nonyl, l-decylimidazoline N-CHg CnHu.C I
2-oleylimidazoilne N-CH:
CQHll-C'Hl-C N (in. 2-cyclohexylethyl, l-methylimidazoline N-CH,
CnHmC I CaHa 2-ubietyl, l-ethyloxyethylimidazoline Suitable substituted imidazolines in which the aliphatic-or cycloaliphatic group containing from g 8 to 32 carbon atoms is the 1-position substituent or is a part of this substituent, are exemplified by the following:
v I NCH:
Ha l-octadecylimidazoline N -cm cmo N- Hz 2-methyl, l-octylimidazoline NCH OHCHM) I IIIaOCnHu I I-dodecyloxymethyl, Z-hydroxymethylimidazoline r-cm CLCHz-C AOOCuHaz l-oleoioxyethyl, 2-chloromethylimidazoline N-cm sin,
:HLNECuHa l-Ndecylaminoethyl, 2-ethylimidazoline N-O H| n n l-abletyl, 2-phenylimidazollne We have pointed out above that imidazoline containing basic nitrogen groups, in addition to those occurring in'the imidazoline ring are particularly efiective corrosion inhibitors. Such products are readily prepared from the commercially available polyethylene polyaznines, or from polyamines in which there are three or more ami- (3) CHLC L N- H2- 1H LNH. CgHnNH. C "Ha 2-methyl, l-hexadecylaminoethylaminoethyllmidazoline' -om (4) N- H; v ;H.NH.C1:H1
I-dodecylaminopropylimldazoline N-CH 7 N H. Y
QHLNH.GIHIOOC.GUHH l-stearoyloxyethylaminoethylimidazoline N-cn came 1 1H4.N.C 3360 R 2-eth l. 1- N.N dode l 11 1'0 eth 1 aminoe 1- Y has H my N-cm no H .NH.C H4NH0 013 11 l-stearamidoethylaminoethylimidanoline N-om 2: 1- (N-dodccyl) -acet21midoethylaminoetliylimiduzoline Chloropnraflln alkylation product of l-aminoethyl, 2-methylimlduzoline Although we have shown above the composition ot a number oi! effective inhibitors which are decyl, oleyl, abietyl, stearyl, and the like.
The corrosion preventive products of the present invention, since they contain an imida- 3 Y obtain equally suitable derivatives of imidazolines which may be employed in the present process.
For details of preparation or various imidazolinium salts, such as those mentioned above, see, for example, Shepard and Shonle, J. A. C. S. 69, 2269 (1947).
Although we have described the corrosion inhibitors of our process as imidazolinea'we may, in many instances, employ these compounds in the form of their salts, either with organic or inorganic acids. Being relatively strong bases. the imidazolines readily form such salts, and where the reagent contains basic groups in addition to the imidazoline ring nitrogen atoms, they may form dior polysalts. Examples of acids which may be used to form such salts are hydrochloric acid, sulfuric acid, acetic acid, oxalic acid, maleic acid, oleic acid, abietic acid, phosphoric acid, petroleum sulphonic acid, naphthenic acid, ricligsin, phenylacetic acid, benzoic acid, and the l e.
Salts of the imidazolines, such as those above described, appear to be equally as effective as zoline ring, may, in general, be alkylated to form either a l-alkyl-substituted imidazoline, or a quaternary ammonium salt, where the alkyl group is attached to either or both the 1 and 3 I nitrogen atoms. For example, using cetyl bro mide as a typical alkylating agent, the following reactions may be carried out:
Iii-CH:
( 'CieHnBr 11.0
Kin,
' above, one may use other alkylating' agents such as methyl bromide, benzyl chloride, ethyl suliate, dichloroethyl ether, chloroparafiln, etc., to
them above as single ring compounds, it should be pointed out that in some instances reagent compounds containing two or more heterocyclic rings, such as two imidazoline rings may be employed. For example, if one reacts one mole of triethylene tetramine with-a mole of stearic acid to form a substituted heptadecylimidazoline, and then reacts this further with another mole of a carboxylic acid at a suitable high temperature, a diimidazoline is obtained.
mncmtnacintnmcmrnn, 4-
Triethylenetetramine N-CH:
C11H$LCOOH CHaCOOH --0 CnHgnO Stem-lo acid Acetic acid N-CH; CH3.C
Similarly,
H;N.C H4.NH.C=H4.NH.C H4.NH.CgHr-NH;
Tetraethylenepentamine I i- 01H coon uncoon c n c Stea th: acid Ac'etio acid I1:114 l es i NCH3 Such diimidazolines are intended to be included when reference is made to substituted imidazolines herein or in the claims.
Many obvious simple derivatives of the herein described corrosion inhibitors may be prepared which are also efiective. For example, we have deflned the groups R and R in the structural formulae aboveas being members of the class consisting of hydrogen, aliphatic. and cycloaliphatic hydrocarbon groups. Actually, the use of halogenated hydrocarbon groups appears to yield equally effective reagents, and chlorohydrocarbon groups, particularly, are readily introduced during synthesis. Since the chlorine atoms in these groups are relatively non-reactive and yield 1 I For injection into the well annulus, the corrosion inhibitor is usually employed as a solution in a suitable solvent, such as mineral oil, methylethyl ketone, xylene, kerosene, or even water. The selection of solvent will depend much upon the exact reagent being used and its solubility characteristics. It is also generally desirable to employ a solvent which will yield a solution of low products with solubilities similar to the hydrocarv bon derivativeythey do not diiier greatly in behavior from the corresponding hydrocarbon derivative. 4 a
Imidazolines containing a relatively high molecular weight hydrocarbon radical, and substituted in the 4- and/or 5- ring positions are also effective inhibitors, but are'not so readily prepared from presently available commercial reagents. 1
The method of carrying out our process is relatively simple in principle. The corrosion preventive reagent is dissolved in the liquid corrosive medium in small amounts and is thus kept in contact with the metal surface to be protected. Alternatively, the corrosion inhibitor may be applied first to the metal surface, either as is, or as a solution in some carrier liquid or paste. Continuous application, as in the corrosive solution, is the preferred method, however.
The present process finds particular utility in the protection of metal equipment of oil and gas day. -The brine contained 2.75% chlorides as wells, especially those containing or producing.
an acidic constituent such as H25, CO2, organic acids and the like. For the protection of such wells, the reagent, either undiluted or-dissolved in a suitable solvent, is fed down the annulus of the well. between the casing and producing tubular where it becomes commingled with the fluid in the well and is pumped or flowed. from the well with these fluids, thus contacting the inner wall of the casing, the outer and inner wall of tubing, and the innersurface of all wellhead fittings, connections and flow lines handling the corrosive Where the inhibitor composition is a liquid, it is conventionally fed into the well annulus by means of a motor driven chemical injector pump, or it may be dumped periodically (e. 8-, once every day or two) into the annulus by means of a socalled "boll weevil device or similar arrangement. Where the inhibitor is asolid, it may be dropped into the well as a solid lump or stick, it may be blown in as a powder with gas, or it may be washed in with a'small stream of the well fluids or other liquid. 7 Where there is gas pressure on the casing, it is necessary, of course, to employ any of these treating methods through a pressure equalizing chamber equipped to allow introduction 01 reagent into the chamber, equalization of pressure between chamber and easing,
1 and travel of reagent from chamber to well caspump. This results, for example, when the tub- I ing is surrounded at some point by a packing held by the casing or earth formation below-the casing. In such wells the reagent may be introduced into the tubing through a pressure equalizing vessel, after stopping the flow of fluids. After being so treated, the well should be left closed in for a period of time suflicient to permit the re-' agent to drop to the bottom of the well.
densate wells, the amount of corrosion inhibitor freezing point, so as to obviate the necessity of heating the solution and injection equipment during winter use.
For treating wells with packed-off tubing, the use of solid sticks" or plugs of inhibitor is especially convenient. These may be prepared by blending the inhibitor with a mineral wax, asphalt or resin in a proportion sufiicient to give a moderately hard and high-melting solid which can be handled and fed into the well conveniently.
The amount of corrosion preventive agent required in our process varies with the corrosiveness of the-system, but where a continuous or semi-continuous treating procedure is carried out as described above, the addition of reagent in the proportion of from one part per 1,000 to one part per 20,000 or more parts of corrosive fluid will generally provide protection. As an example of treating procedure and results, the following actual well-treatment history is presented.
Treatment was made of a West Texas oil well producing 15 bbls. of oil and 1 bbl. of brine per NaCl, and 275 parts per million of hydrogen sulfide. A solution 'of 2-heptadecylimidazoline in aromatic "naphtha was pumped continuously down the annulus of the well at such a rate that one part of imidazoline was introduced per 8,000
'parts-of oil produced. While thus treating the well, weighed steel test plates were kept exposed to the well fluids in the tubing and were-periodically (every two weeks) removed, cleaned and reweighed to determine the corrosion rate. The initial corrosion rate in this well before treatment began was 0.016 inch per year. While treated as described above. the corrosion rate was found to be 0.0005 inch per year. The rate of imidazoline injection was then reduced to one part per 20,000 parts of oil, and the corrosion rate was found to be 0.0009 inch per year. The ratio of inhibitor was then increased to one partin 40,000 parts of oil'and the corrosion rate rose to 0.003 inch per year. Finally, chemical injection was stopped. It was found that after 30 days the tha.- The amount of solution used was such as'to provide an average concentration of one part of l-dodecyl,2-methylimidazoline per 6,000 parts of oil produced. 'The corrosion rate of steel coupons exposed in the well head was reducedfrom a blank value of 0.015 inch per year to 0.0015 inch per year.
The protective action of the herein described reagents appears to be maintained for an appreciable time after treatment ceases, but eventually islost unless another application is -made.
For the protection of gas wells and gas-conrequired will usually be within range of one-half to 3 lbs. per million cubic feet of gas produced, depending upon the amounts and composition of corrosive agents in the gas and the amount of liquid hydrocarbon and water produced. However, in no case does the amount of inhibitor required appear to be stoichiometrically related to the amount of acids produced by a well, since protection is obtained with much less imidazoline than usually would be required for neutralization of the acids produced.
Recapitulating, we have found that the corrosion of metals, and particularly ferrous metals, may be inhibited by the application thereto of a substituted imidazoline in which a substituent at either or both the 1- or 2-position of the ring contains an aliphatic or cycloaliphatic hydrocarbon group having from 8 to 32 carbon atoms. Of this broad genus of corrosion inhibitors, there are several sub-classes which may be employed efiectlvely in our process. Such sub-classes are, (1)
those in which the 1-position substituent contains amino group, (2) those in which the l-position substituent is free or amino groups, (3) those in which the 4- and/or 5-position ring carbons are substituted, etc. The process of inhibiting corrosion employing the first of these sub-classes forms the subject-matter of our co-pending application for patent, Serial No. 1,657, filed January 10, 1948.
Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:
1. A process for preventing corrosion of metals, comprising the step of applying to such metals a substituted imidazoline selected from the class consisting of:
in which D represents a divalent, non-amino, organic radical containing less than carbon atoms, composed of elements from the group consisting of C. H, O, and N; D represents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C. H, O, and N, and containing at least one amino group; and R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
2. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals a substituted imidazoline selected from the class consistin of:
atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group; and R is a member of the class consisting of hydrogen and aliphatic and cyclo aliphatic hydrocarbon radicals; with the proviso 12 that at least one occurrence of R contains 8 to 32 carbon atoms.
3. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals a substituted imidazoline selected from the class consisting of:
in which D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N; D represents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group; and R is a member of the class consisting. of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of It contains 10 to 20 carbon atoms.
4. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals a substituted imidazoline of the following formula:
in which R is a member of the class consisting P of aliphatic and cycloaliphatic hydrocarbon radimetals a substituted imidazoline of the following in which R is ,an aliphatic hydrocarbon radical containing from 10 to 20 carbon atoms.
6. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals 2-heptadecenylimidazoline.
7. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals a substituted imidazoline of the following formula:
where R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrenceof R contains 10 to 20 carbon atoms.
p 8. A process for preventing corrosion of ferrous metals, comprising the step of applying to'such metals a substituted imidazoline of the following formula:
mula:
in which R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hy- I N-CH;
R-C- l A \N- H} R in which D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N; and R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains to carbon atoms.
11. A process for preventing corrosion of ferrous metals, comprising the step of applying to such metals a substituted imidazoline of the forin which D represents a divalent, non-amino, organic radical containing less than carbon atoms, composed of elements from the group consisting of C, H, O, and N; and R is an aliphatic hydrocarbon radical having from 10 to 20 carbon a oms.
12. A process for preventing corrosion of oil and gas well equipment, comprising the step of injecting into the well as substituted imidazoline selected from the class of:
ir-on, r-cn, 214m, g r-on, n-o R-C 18-0 3-0 NlHg NlHg N-JZH, N-lH, i l in 'a in which D represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N; 13' repre ents a divalent, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group; and R is a member of the class consisting of hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals: with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
13. A process for preventing corrosion of oil and gas well equipment, comprising the step ofinjecting into the well a substituted imidazoline of the following formula:
N-OH:
14. A process for preventing corrosion of oil and gas well equipment, comprising the step of injecting into the well as substituted imidazoline of the following formula:
where R is a member of the class consisting of' hydrogen and aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso thatat least one occurrence of R contains '10 to 20 carbon atoms.
15. A process for preventing corrosion of oil and gas well equipment, comprising the step of injecting into the well as substituted imidazoline of the formula:
N-CH,
in which D' represents a divalent, non-amino, organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, 0, and N; D represents a divalent,
N-cn, N-cn, R
organic radical containing less than 25 carbon atoms, composed of elements from the group consisting of C, H, O, and N, and containing at least one amino group; audit is a member of the class consisting of hydrogen and-aliphatic and cycloaliphatic hydrocarbon radicals; with the proviso that at least one occurrence of R contains 8 to 32 carbon atoms.
CHARLES M. 3mm. Ja. WILLIAM F. oaoss.
REFERENCES crrnn The following references are of record in the file of this patent:
nrrnn STATES PATENTS Name Date Walker Oct. 2'1, 1981 Walker Aug. 28, 1932 Smith Sept. 5, 1944 OTHER REFERENCES Formaldehyde vs. Sulfide Corrosion, article in Industrial and Engineering Chemistry, Industrial edition, Special Depta, vol. 38, pages 10 and 1,
January 16, 1946.
corrosiagn. article in The Oil Number Condensate Field Weekly, May 6, 1946, page a substituted imidazoline selected fromthe class
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1656A US2468163A (en) | 1948-01-10 | 1948-01-10 | Processes for preventing corrosion and corrosion inhibitors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1656A US2468163A (en) | 1948-01-10 | 1948-01-10 | Processes for preventing corrosion and corrosion inhibitors |
Publications (1)
Publication Number | Publication Date |
---|---|
US2468163A true US2468163A (en) | 1949-04-26 |
Family
ID=21697171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US1656A Expired - Lifetime US2468163A (en) | 1948-01-10 | 1948-01-10 | Processes for preventing corrosion and corrosion inhibitors |
Country Status (1)
Country | Link |
---|---|
US (1) | US2468163A (en) |
Cited By (89)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2598213A (en) * | 1949-09-01 | 1952-05-27 | Petrolite Corp | Process for preventing corrosion and corrosion inhibitors |
US2640029A (en) * | 1951-05-23 | 1953-05-26 | Petrolite Corp | Process for preventing corrosion |
US2643227A (en) * | 1950-02-21 | 1953-06-23 | Cities Service Oil Co | Method of inhibiting corrosion of metals |
US2643978A (en) * | 1951-02-24 | 1953-06-30 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2646400A (en) * | 1951-02-24 | 1953-07-21 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2658036A (en) * | 1950-07-19 | 1953-11-03 | Texas Acidizers Inc | Composition for preventing deposition and corrosion in oil well equipment |
US2727003A (en) * | 1953-05-01 | 1955-12-13 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2738325A (en) * | 1954-04-08 | 1956-03-13 | Nat Aluminate Corp | Method of treating water introduced into underground formations |
US2756211A (en) * | 1956-07-24 | jones | ||
US2766132A (en) * | 1950-12-21 | 1956-10-09 | Petrolite Corp | Carbonate rock aggreate bonded with bitumen containing a polyalkylene polyamino imidazoline |
US2779741A (en) * | 1950-12-26 | 1957-01-29 | Gen Aniline & Film Corp | Water-soluble compositions containing water-insoluble organic amines |
US2785126A (en) * | 1953-09-29 | 1957-03-12 | California Research Corp | Corrosion inhibiting method and composition |
US2793997A (en) * | 1954-05-17 | 1957-05-28 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2824059A (en) * | 1954-02-08 | 1958-02-18 | Nat Aluminate Corp | Corrosion inhibitor composition and method of preventing corrosion |
US2836557A (en) * | 1954-05-17 | 1958-05-27 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2851415A (en) * | 1954-05-17 | 1958-09-09 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2856358A (en) * | 1955-05-02 | 1958-10-14 | Continental Oil Co | Method of inhibiting corrosion |
US2865817A (en) * | 1956-08-17 | 1958-12-23 | Nat Aluminate Corp | Coke quenching liquids |
US2888400A (en) * | 1954-04-20 | 1959-05-26 | Nat Aluminate Corp | Process for preventing corrosion |
US2889278A (en) * | 1956-03-23 | 1959-06-02 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2889334A (en) * | 1956-01-17 | 1959-06-02 | Cities Service Res & Dev Co | Imidazoline derivatives |
US2894908A (en) * | 1957-02-06 | 1959-07-14 | Cities Service Res & Dev Co | Acidizing wells |
US2894907A (en) * | 1957-02-06 | 1959-07-14 | Cities Service Res & Dev Co | Acidizing wells |
US2894848A (en) * | 1956-10-29 | 1959-07-14 | Minerals & Chemicals Corp Of A | Joint sealing compounds containing attapulgite |
US2895961A (en) * | 1956-03-14 | 1959-07-21 | Cities Service Res & Dev Co | Compounds containing the imidazoline and imidazolidone or imidazolidine-thione groups |
US2901430A (en) * | 1953-11-06 | 1959-08-25 | Gen Aniline & Film Corp | Corrosion inhibition |
US2902447A (en) * | 1954-09-10 | 1959-09-01 | Dearborn Chemicals Co | Composition and method for inhibition of corrosion |
US2906635A (en) * | 1957-09-30 | 1959-09-29 | Dow Chemical Co | Modified asphalt |
US2911419A (en) * | 1956-05-01 | 1959-11-03 | Cities Service Res & Dev Co | 1-(2-thiazolinyl), 4-(2-oxazolinyl) benzene |
US2915376A (en) * | 1956-05-28 | 1959-12-01 | Shell Dev | Perfluoroalkylimidazolines and compositions containing the same |
US2918474A (en) * | 1956-06-11 | 1959-12-22 | Cities Service Res & Dev Co | Certain maleimido derivatives of aliphatic-bis-imidazolines |
US2935474A (en) * | 1955-11-28 | 1960-05-03 | Visco Products Co | Process of inhibiting corrosion and corrosion inhibiting compositions |
US2944968A (en) * | 1956-11-30 | 1960-07-12 | Petrolite Corp | Method for preventing corrosion of ferrous metals |
US2950246A (en) * | 1956-02-01 | 1960-08-23 | Cities Service Res & Dev Co | Process for increasing the permeability of oil bearing chalk formations |
US2950211A (en) * | 1957-03-06 | 1960-08-23 | Cincinnati Milling Machine Co | Heterocyclic asphalt additives |
US2957824A (en) * | 1958-01-10 | 1960-10-25 | Nalco Chemical Co | Corrosion inhibitor composition and method of preventing corrosion |
US2957823A (en) * | 1957-02-06 | 1960-10-25 | Cities Service Res & Dev Co | Process for acidizing wells and composition therefor |
US2978410A (en) * | 1957-11-27 | 1961-04-04 | Union Oil Co | Corrosion-resistant grease |
DE1105685B (en) * | 1954-08-11 | 1961-04-27 | Basf Ag | Agent for protecting metal surfaces against stress corrosion |
US2987514A (en) * | 1958-03-03 | 1961-06-06 | Petrolite Corp | Polyesters |
US2987522A (en) * | 1958-03-17 | 1961-06-06 | Petrolite Corp | Amidine products |
US2987515A (en) * | 1958-02-03 | 1961-06-06 | Petrolite Corp | Urethanes |
US2987521A (en) * | 1958-03-03 | 1961-06-06 | Petrolite Corp | Polymeric partial esters of hydrocarbon-diimidazolinylalkanols and dicarboxylic acids |
US3008898A (en) * | 1959-06-26 | 1961-11-14 | Cities Service Res & Dev Co | Method of inhibiting corrosion |
US3014864A (en) * | 1958-03-03 | 1961-12-26 | Petrolite Corp | Process of inhibiting corrosion |
US3015622A (en) * | 1958-03-17 | 1962-01-02 | Petrolite Corp | Process of inhibiting corrosion |
US3017352A (en) * | 1958-03-03 | 1962-01-16 | Petrolite Corp | Process of inhibiting corrosion |
US3017356A (en) * | 1958-03-03 | 1962-01-16 | Petrolite Corp | Process of inhibiting corrosion |
US3018246A (en) * | 1958-02-03 | 1962-01-23 | Petrolite Corp | Process of preventing corrosion |
US3024236A (en) * | 1958-06-04 | 1962-03-06 | Petrolite Corp | Derivatives of pyrimidine and imidazoline |
US3066097A (en) * | 1960-06-09 | 1962-11-27 | Pan American Petroleum Corp | Polyalkyl pyridines for corrosion inhibiting |
US3070453A (en) * | 1959-06-22 | 1962-12-25 | Monsanto Chemicals | Bituminous compositions |
US3070455A (en) * | 1959-06-22 | 1962-12-25 | Monsanto Chemicals | Bituminous compositions |
US3096294A (en) * | 1958-06-04 | 1963-07-02 | Petrolite Corp | Process of inhibiting corrosion |
US3106531A (en) * | 1958-05-08 | 1963-10-08 | Petrolite Corp | Process of acidizing oil-bearing strata and composition therefor |
US3114649A (en) * | 1960-05-03 | 1963-12-17 | Katz Jacob | Fatty derivatives of aminoalkyl and hydroxyalkyl heterocyclic amine bases as asphalt additives |
US3172854A (en) * | 1965-03-09 | Corrosion inhibition process | ||
DE1188751B (en) * | 1955-03-19 | 1965-03-11 | Exxon Standard Sa | Corrosion protection mixtures |
US3197403A (en) * | 1960-04-04 | 1965-07-27 | Continental Oil Co | Acidizing corrosion inhibitor |
US3200071A (en) * | 1961-11-01 | 1965-08-10 | Petrolite Corp | Composition and process for inhibiting corrosion of ferrous metal |
US3316176A (en) * | 1967-04-25 | Paper making process | ||
US3337472A (en) * | 1966-04-08 | 1967-08-22 | Union Oil Co | Composition for inhibiting corrosion |
US3408297A (en) * | 1966-02-28 | 1968-10-29 | Sinclair Research Inc | Corrosion-resistant soluble oil composition |
US3488294A (en) * | 1966-01-17 | 1970-01-06 | Petrolite Corp | Process of inhibiting corrosion of ferrous metals and alloys employing a polyvinyl heterocyclic polymer |
US3502578A (en) * | 1966-06-30 | 1970-03-24 | Shell Oil Co | Corrosion inhibiting method and composition therefor |
US3514251A (en) * | 1965-10-22 | 1970-05-26 | Petrolite Corp | Use of heterocyclic polymers as corrosion inhibitors |
US3623979A (en) * | 1967-06-29 | 1971-11-30 | Texaco Inc | Composition and process for inhibiting corrosion in oil wells |
US3625859A (en) * | 1968-08-06 | 1971-12-07 | San Abbott Ltd | Corrosion inhibiting composition |
US3770055A (en) * | 1969-01-10 | 1973-11-06 | Marathon Oil Co | Film forming hydrazine-containing corrosion inhibitor |
US3922446A (en) * | 1971-10-15 | 1975-11-25 | Henkel & Cie Gmbh | Process of impregnating leather and leather substitute materials |
US3933531A (en) * | 1972-04-11 | 1976-01-20 | Natsuo Sawa | Method of rust-preventing for copper and copper alloy |
US3997293A (en) * | 1974-03-19 | 1976-12-14 | Petrolite Corporation | Use of dihydro-nitrogen heterocyclic phosphoramidates as corrosion inhibitors |
US4000079A (en) * | 1972-07-18 | 1976-12-28 | Bayer Aktiengesellschaft | Anticorrosives |
DE2846977A1 (en) * | 1977-10-31 | 1979-05-10 | Exxon Research Engineering Co | SALTWATER SAFE CORROSION INHIBITORS |
JPS5690983A (en) * | 1979-12-24 | 1981-07-23 | Nippon Steel Corp | Restraining method for corrosion of steel material against solution containing sour gas |
JPS5690982A (en) * | 1979-12-24 | 1981-07-23 | Nippon Steel Corp | Restraining method for corrosion of steel material against solution containing sour gas |
US4501677A (en) * | 1983-11-02 | 1985-02-26 | Exxon Research & Engineering Co. | Heterocyclic nitrogen compounds--organometallic salt complexes as corrosion inhibitors in lubricating oils |
US4554090A (en) * | 1984-03-09 | 1985-11-19 | Jones L W | Combination corrosion/scale inhibitor |
US4614600A (en) * | 1984-10-31 | 1986-09-30 | Westvaco Corporation | Corrosion inhibitors |
US4713184A (en) * | 1985-09-26 | 1987-12-15 | Zaid Najib H | Dispersed oil soluble corrosion inhibitor and water soluble phosphonate scale inhibitor composition |
US4877552A (en) * | 1986-09-02 | 1989-10-31 | Ciba-Geigy Corporation | Corrosion inhibitor |
US4906392A (en) * | 1986-04-18 | 1990-03-06 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US4976881A (en) * | 1986-04-18 | 1990-12-11 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US5039436A (en) * | 1986-04-18 | 1991-08-13 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US5151220A (en) * | 1990-08-07 | 1992-09-29 | Nalco Chemical Company | Chemical abatement of carbonate cracking |
EP0651074A1 (en) * | 1993-11-02 | 1995-05-03 | Petrolite Corporation | Biodegradable corrosion inhibitors of low toxicity |
EP1618230A2 (en) * | 2003-04-11 | 2006-01-25 | Nalco Energy Services, L.P. | Imidazoline corrosion inhibitors |
WO2014028490A1 (en) | 2012-08-14 | 2014-02-20 | Cst Performance Products Corp. | Crosslinking composition for hydrocarbon gels |
US10316413B2 (en) | 2015-08-18 | 2019-06-11 | Baker Hughes, A Ge Company, Llc | Self-healing coatings for oil and gas applications |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1829705A (en) * | 1925-03-12 | 1931-10-27 | Empire Oil & Refining Company | Prevention of corrosion in oil wells |
US1873084A (en) * | 1928-07-19 | 1932-08-23 | Empire Oil And Refining Compan | Method of preventing corrosion in oil wells |
US2357559A (en) * | 1942-08-24 | 1944-09-05 | Odessa Chemical And Equipment | Method of sweetening sour gas and preventing corrosion of oil producing wells |
-
1948
- 1948-01-10 US US1656A patent/US2468163A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1829705A (en) * | 1925-03-12 | 1931-10-27 | Empire Oil & Refining Company | Prevention of corrosion in oil wells |
US1873084A (en) * | 1928-07-19 | 1932-08-23 | Empire Oil And Refining Compan | Method of preventing corrosion in oil wells |
US2357559A (en) * | 1942-08-24 | 1944-09-05 | Odessa Chemical And Equipment | Method of sweetening sour gas and preventing corrosion of oil producing wells |
Cited By (94)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756211A (en) * | 1956-07-24 | jones | ||
US3316176A (en) * | 1967-04-25 | Paper making process | ||
US3172854A (en) * | 1965-03-09 | Corrosion inhibition process | ||
US2598213A (en) * | 1949-09-01 | 1952-05-27 | Petrolite Corp | Process for preventing corrosion and corrosion inhibitors |
US2643227A (en) * | 1950-02-21 | 1953-06-23 | Cities Service Oil Co | Method of inhibiting corrosion of metals |
US2658036A (en) * | 1950-07-19 | 1953-11-03 | Texas Acidizers Inc | Composition for preventing deposition and corrosion in oil well equipment |
US2766132A (en) * | 1950-12-21 | 1956-10-09 | Petrolite Corp | Carbonate rock aggreate bonded with bitumen containing a polyalkylene polyamino imidazoline |
US2779741A (en) * | 1950-12-26 | 1957-01-29 | Gen Aniline & Film Corp | Water-soluble compositions containing water-insoluble organic amines |
US2646400A (en) * | 1951-02-24 | 1953-07-21 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2643978A (en) * | 1951-02-24 | 1953-06-30 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2640029A (en) * | 1951-05-23 | 1953-05-26 | Petrolite Corp | Process for preventing corrosion |
US2727003A (en) * | 1953-05-01 | 1955-12-13 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2785126A (en) * | 1953-09-29 | 1957-03-12 | California Research Corp | Corrosion inhibiting method and composition |
US2901430A (en) * | 1953-11-06 | 1959-08-25 | Gen Aniline & Film Corp | Corrosion inhibition |
US2824059A (en) * | 1954-02-08 | 1958-02-18 | Nat Aluminate Corp | Corrosion inhibitor composition and method of preventing corrosion |
US2738325A (en) * | 1954-04-08 | 1956-03-13 | Nat Aluminate Corp | Method of treating water introduced into underground formations |
US2888400A (en) * | 1954-04-20 | 1959-05-26 | Nat Aluminate Corp | Process for preventing corrosion |
US2851415A (en) * | 1954-05-17 | 1958-09-09 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2836557A (en) * | 1954-05-17 | 1958-05-27 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2793997A (en) * | 1954-05-17 | 1957-05-28 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
DE1105685B (en) * | 1954-08-11 | 1961-04-27 | Basf Ag | Agent for protecting metal surfaces against stress corrosion |
US2902447A (en) * | 1954-09-10 | 1959-09-01 | Dearborn Chemicals Co | Composition and method for inhibition of corrosion |
DE1188751B (en) * | 1955-03-19 | 1965-03-11 | Exxon Standard Sa | Corrosion protection mixtures |
US2856358A (en) * | 1955-05-02 | 1958-10-14 | Continental Oil Co | Method of inhibiting corrosion |
US2935474A (en) * | 1955-11-28 | 1960-05-03 | Visco Products Co | Process of inhibiting corrosion and corrosion inhibiting compositions |
US2889334A (en) * | 1956-01-17 | 1959-06-02 | Cities Service Res & Dev Co | Imidazoline derivatives |
US2950246A (en) * | 1956-02-01 | 1960-08-23 | Cities Service Res & Dev Co | Process for increasing the permeability of oil bearing chalk formations |
US2895961A (en) * | 1956-03-14 | 1959-07-21 | Cities Service Res & Dev Co | Compounds containing the imidazoline and imidazolidone or imidazolidine-thione groups |
US2889278A (en) * | 1956-03-23 | 1959-06-02 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
US2911419A (en) * | 1956-05-01 | 1959-11-03 | Cities Service Res & Dev Co | 1-(2-thiazolinyl), 4-(2-oxazolinyl) benzene |
US2915376A (en) * | 1956-05-28 | 1959-12-01 | Shell Dev | Perfluoroalkylimidazolines and compositions containing the same |
US2918474A (en) * | 1956-06-11 | 1959-12-22 | Cities Service Res & Dev Co | Certain maleimido derivatives of aliphatic-bis-imidazolines |
US2865817A (en) * | 1956-08-17 | 1958-12-23 | Nat Aluminate Corp | Coke quenching liquids |
US2894848A (en) * | 1956-10-29 | 1959-07-14 | Minerals & Chemicals Corp Of A | Joint sealing compounds containing attapulgite |
US2944968A (en) * | 1956-11-30 | 1960-07-12 | Petrolite Corp | Method for preventing corrosion of ferrous metals |
US2894908A (en) * | 1957-02-06 | 1959-07-14 | Cities Service Res & Dev Co | Acidizing wells |
US2957823A (en) * | 1957-02-06 | 1960-10-25 | Cities Service Res & Dev Co | Process for acidizing wells and composition therefor |
US2894907A (en) * | 1957-02-06 | 1959-07-14 | Cities Service Res & Dev Co | Acidizing wells |
US2950211A (en) * | 1957-03-06 | 1960-08-23 | Cincinnati Milling Machine Co | Heterocyclic asphalt additives |
US2906635A (en) * | 1957-09-30 | 1959-09-29 | Dow Chemical Co | Modified asphalt |
US2978410A (en) * | 1957-11-27 | 1961-04-04 | Union Oil Co | Corrosion-resistant grease |
US2957824A (en) * | 1958-01-10 | 1960-10-25 | Nalco Chemical Co | Corrosion inhibitor composition and method of preventing corrosion |
US2987515A (en) * | 1958-02-03 | 1961-06-06 | Petrolite Corp | Urethanes |
US3018246A (en) * | 1958-02-03 | 1962-01-23 | Petrolite Corp | Process of preventing corrosion |
US3017356A (en) * | 1958-03-03 | 1962-01-16 | Petrolite Corp | Process of inhibiting corrosion |
US2987514A (en) * | 1958-03-03 | 1961-06-06 | Petrolite Corp | Polyesters |
US3017352A (en) * | 1958-03-03 | 1962-01-16 | Petrolite Corp | Process of inhibiting corrosion |
US3014864A (en) * | 1958-03-03 | 1961-12-26 | Petrolite Corp | Process of inhibiting corrosion |
US3020276A (en) * | 1958-03-03 | 1962-02-06 | Petrolite Corp | Cyclic amidines |
US2987521A (en) * | 1958-03-03 | 1961-06-06 | Petrolite Corp | Polymeric partial esters of hydrocarbon-diimidazolinylalkanols and dicarboxylic acids |
US2987522A (en) * | 1958-03-17 | 1961-06-06 | Petrolite Corp | Amidine products |
US3015622A (en) * | 1958-03-17 | 1962-01-02 | Petrolite Corp | Process of inhibiting corrosion |
US3106531A (en) * | 1958-05-08 | 1963-10-08 | Petrolite Corp | Process of acidizing oil-bearing strata and composition therefor |
US3096294A (en) * | 1958-06-04 | 1963-07-02 | Petrolite Corp | Process of inhibiting corrosion |
US3024236A (en) * | 1958-06-04 | 1962-03-06 | Petrolite Corp | Derivatives of pyrimidine and imidazoline |
US3070455A (en) * | 1959-06-22 | 1962-12-25 | Monsanto Chemicals | Bituminous compositions |
US3070453A (en) * | 1959-06-22 | 1962-12-25 | Monsanto Chemicals | Bituminous compositions |
US3008898A (en) * | 1959-06-26 | 1961-11-14 | Cities Service Res & Dev Co | Method of inhibiting corrosion |
US3197403A (en) * | 1960-04-04 | 1965-07-27 | Continental Oil Co | Acidizing corrosion inhibitor |
US3114649A (en) * | 1960-05-03 | 1963-12-17 | Katz Jacob | Fatty derivatives of aminoalkyl and hydroxyalkyl heterocyclic amine bases as asphalt additives |
US3066097A (en) * | 1960-06-09 | 1962-11-27 | Pan American Petroleum Corp | Polyalkyl pyridines for corrosion inhibiting |
US3200071A (en) * | 1961-11-01 | 1965-08-10 | Petrolite Corp | Composition and process for inhibiting corrosion of ferrous metal |
US3514251A (en) * | 1965-10-22 | 1970-05-26 | Petrolite Corp | Use of heterocyclic polymers as corrosion inhibitors |
US3488294A (en) * | 1966-01-17 | 1970-01-06 | Petrolite Corp | Process of inhibiting corrosion of ferrous metals and alloys employing a polyvinyl heterocyclic polymer |
US3408297A (en) * | 1966-02-28 | 1968-10-29 | Sinclair Research Inc | Corrosion-resistant soluble oil composition |
US3337472A (en) * | 1966-04-08 | 1967-08-22 | Union Oil Co | Composition for inhibiting corrosion |
US3502578A (en) * | 1966-06-30 | 1970-03-24 | Shell Oil Co | Corrosion inhibiting method and composition therefor |
US3623979A (en) * | 1967-06-29 | 1971-11-30 | Texaco Inc | Composition and process for inhibiting corrosion in oil wells |
US3625859A (en) * | 1968-08-06 | 1971-12-07 | San Abbott Ltd | Corrosion inhibiting composition |
US3770055A (en) * | 1969-01-10 | 1973-11-06 | Marathon Oil Co | Film forming hydrazine-containing corrosion inhibitor |
US3922446A (en) * | 1971-10-15 | 1975-11-25 | Henkel & Cie Gmbh | Process of impregnating leather and leather substitute materials |
US3933531A (en) * | 1972-04-11 | 1976-01-20 | Natsuo Sawa | Method of rust-preventing for copper and copper alloy |
US4000079A (en) * | 1972-07-18 | 1976-12-28 | Bayer Aktiengesellschaft | Anticorrosives |
US3997293A (en) * | 1974-03-19 | 1976-12-14 | Petrolite Corporation | Use of dihydro-nitrogen heterocyclic phosphoramidates as corrosion inhibitors |
DE2846977A1 (en) * | 1977-10-31 | 1979-05-10 | Exxon Research Engineering Co | SALTWATER SAFE CORROSION INHIBITORS |
FR2407275A1 (en) * | 1977-10-31 | 1979-05-25 | Exxon Research Engineering Co | Anticorrosion compsns. for oil well brine - contg. imidazoline salt, oil soluble organic solvent and hydrocarbon oil |
JPS5690983A (en) * | 1979-12-24 | 1981-07-23 | Nippon Steel Corp | Restraining method for corrosion of steel material against solution containing sour gas |
JPS5690982A (en) * | 1979-12-24 | 1981-07-23 | Nippon Steel Corp | Restraining method for corrosion of steel material against solution containing sour gas |
US4501677A (en) * | 1983-11-02 | 1985-02-26 | Exxon Research & Engineering Co. | Heterocyclic nitrogen compounds--organometallic salt complexes as corrosion inhibitors in lubricating oils |
US4554090A (en) * | 1984-03-09 | 1985-11-19 | Jones L W | Combination corrosion/scale inhibitor |
US4614600A (en) * | 1984-10-31 | 1986-09-30 | Westvaco Corporation | Corrosion inhibitors |
US4713184A (en) * | 1985-09-26 | 1987-12-15 | Zaid Najib H | Dispersed oil soluble corrosion inhibitor and water soluble phosphonate scale inhibitor composition |
US5039436A (en) * | 1986-04-18 | 1991-08-13 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US4906392A (en) * | 1986-04-18 | 1990-03-06 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US4976881A (en) * | 1986-04-18 | 1990-12-11 | The Lubrizol Corporation | Coupled polyamine lubricant additives derived from hydrocarbyl polynitriles and polyamines |
US4877552A (en) * | 1986-09-02 | 1989-10-31 | Ciba-Geigy Corporation | Corrosion inhibitor |
US5151220A (en) * | 1990-08-07 | 1992-09-29 | Nalco Chemical Company | Chemical abatement of carbonate cracking |
EP0651074A1 (en) * | 1993-11-02 | 1995-05-03 | Petrolite Corporation | Biodegradable corrosion inhibitors of low toxicity |
US5785895A (en) * | 1993-11-02 | 1998-07-28 | Petrolite Corporation | Biodegradable corrosion inhibitors of low toxicity |
EP1618230A2 (en) * | 2003-04-11 | 2006-01-25 | Nalco Energy Services, L.P. | Imidazoline corrosion inhibitors |
EP1618230A4 (en) * | 2003-04-11 | 2008-03-12 | Nalco Energy Services Lp | Imidazoline corrosion inhibitors |
WO2014028490A1 (en) | 2012-08-14 | 2014-02-20 | Cst Performance Products Corp. | Crosslinking composition for hydrocarbon gels |
US10316413B2 (en) | 2015-08-18 | 2019-06-11 | Baker Hughes, A Ge Company, Llc | Self-healing coatings for oil and gas applications |
US11492503B2 (en) | 2015-08-18 | 2022-11-08 | Baker Hughes, A Ge Company, Llc | Self-healing coatings for oil and gas applications |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2468163A (en) | Processes for preventing corrosion and corrosion inhibitors | |
US2466517A (en) | Processes for preventing corrosion and corrosion inhibitors | |
USRE23227E (en) | Processes fob preventing corrosion | |
US2640029A (en) | Process for preventing corrosion | |
US4235838A (en) | Use of benzazoles as corrosion inhibitors | |
US2987522A (en) | Amidine products | |
CA2274925C (en) | Corrosion inhibiting compositions and methods | |
US2659693A (en) | Process for preventing corrosion of ferrous metals | |
US4631138A (en) | Corrosion inhibitors | |
US3762873A (en) | Corrosion inhibiting method using substituted succinimides | |
US3502578A (en) | Corrosion inhibiting method and composition therefor | |
US2466530A (en) | Process for preventing corrosion and corrosion inhibitor | |
US4332967A (en) | Compounds containing sulfur and amino groups | |
US4174370A (en) | Substituted pyridines | |
US4252743A (en) | Quaternaries of halogen derivatives of alkynoxymethyl amines | |
US3673196A (en) | Phosphonates of full aromatic nitrogen heterocyclics | |
US4187277A (en) | Process of inhibiting corrosion with quaternaries of halogen derivatives of alkynoxymethyl amines | |
EP0275651A1 (en) | Carbon dioxide corrosion inhibiting composition and method of use thereof | |
US4393026A (en) | Compounds containing sulfur and amino groups | |
US2999811A (en) | Inhibitor composition | |
US4450137A (en) | Processes for inhibiting corrosion using compounds containing sulfur and amino groups | |
US2723233A (en) | Method and composition for inhibiting corrosion | |
US4450138A (en) | Processes for inhibiting corrosion using compounds containing sulfur and amino groups | |
US4332799A (en) | Quaternaries of tertiary amino-substituted thiazines | |
US4220785A (en) | Substituted pyridines |