Aqueous Acid Environment (i.e.,ph Less Than Or Equal To 4.1) Patents (Class 422/12)
  • Patent number: 4744948
    Abstract: A series of water-dispersible corrosion inhibiting solutions and a method of using these solutions are disclosed which contain a thiol ester represented by the formula ##STR1## wherein R is an alkyl group having about 8 to about 22 carbon atoms, or an alkyl or alkylaryl group that is the nucleus of a dimerized fatty acid having about 28 to about 36 carbon atoms, X is a dithiol having about 1 to about 5 carbon atoms, m=0 where R has about 8 to about 22 carbon atoms, m=0 or 1 where R has about 28 to about 36 carbon atom. It has been discovered that the use of these thiol esters along or the addition of the thiol esters to organic inhibitor systems reduces corrosion.
    Type: Grant
    Filed: June 4, 1987
    Date of Patent: May 17, 1988
    Assignee: Texaco Inc.
    Inventor: Michael J. Incorvia
  • Patent number: 4740320
    Abstract: Novel compositions are prepared by reacting hydrocarbyl substituted nitrogen-containing aromatic heterocyclic compounds such as 2,5-dimethylpyridine or 2,4,6-collidine, an aldehyde such as formaldehyde, or a ketone such as acetone, or mixtures thereof and an amine having a combined total of at least seven carbon, nitrogen, oxygen or sulfur atoms and at least one reactive amine hydrogen atom such as 1-dodecanamine in the presence of a suitable catalyst such as hydrogen chloride. These novel compositions, as well as their free amine forms are useful as oil and gas well corrosion inhibitors.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: April 26, 1988
    Assignee: The Dow Chemical Company
    Inventors: Duane S. Treybig, Robert G. Martinez
  • Patent number: 4734259
    Abstract: A composition and method for inhibiting the attack of aqueous corrosive fluids on metal by contacting the metal with a composition including an .alpha.,.beta.-unsaturated aldehyde and a surfactant.
    Type: Grant
    Filed: November 22, 1985
    Date of Patent: March 29, 1988
    Assignee: Dowell Schlumberger Incorporated
    Inventors: Wayne W. Frenier, Frederick B. Growcock
  • Patent number: 4722805
    Abstract: Corrosion inhibitors for ferrous metals are provided which afford protection from general corrosion and cracking-type corrosion, which inhibitors are reaction products of acylated polyamines and phosphate esters.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: February 2, 1988
    Assignee: Petrolite Corporation
    Inventor: Richard L. Martin
  • Patent number: 4719035
    Abstract: The corrosion of molybdenum metal surfaces which come in contact with water-coolant systems is inhibited by the addition of a small amount of a composition containing a combination of a triazole inhibitor, a biocide and a buffering agent. A corrosion inhibiting composition containing benzotriazole as the inhibitor and benzoic acid as both a biocide and buffer proved to be especially effective in preventing the corrosion of molybdenum, tungsten and other metals.
    Type: Grant
    Filed: September 26, 1986
    Date of Patent: January 12, 1988
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Miles R. Palmer
  • Patent number: 4705665
    Abstract: Glycosides and polyglycosides are described having the formulaR(OG).sub.xwhereinR is an aliphatic hydrocarbon radical having from 1 to 25 carbon atoms or is a radical with the formula R.sub.1 (OR.sub.2).sub.n which does not have more than 25 carbon atoms and wherein n=0 to 24 and R.sub.1 and R.sub.2 are aliphatic hydrocarbon radicals,G is selected from the group consisting of fructose, glucose, mannose, galactose, talose, gulose, allose, altrose, idose, arabinose, xylose, lyxose, ribose or mixtures thereof, and x is 1 to 30which glycosides and polyglycosides inhibit oxidation and acid attack of ferrous metals.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: November 10, 1987
    Assignee: A. E. Staley Manufacturing Company
    Inventor: Arshad H. Malik
  • Patent number: 4684507
    Abstract: A process for inhibiting the corrosion of ferrous metals in aqueous acidic or briny media comprising the step of adding a composition of the formula ##STR1## where R.sub.1 is a hydrocarbon group, O is a pyridine or substituted pyridine, and X is an anion.
    Type: Grant
    Filed: October 29, 1982
    Date of Patent: August 4, 1987
    Assignee: Petrolite Corporation
    Inventors: Neil E. S. Thompson, Derek Redmore, Bernardus A. Oude Alink, Benjamin T. Outlaw
  • Patent number: 4676910
    Abstract: Concentrated solutions of sodium sulfite and related compounds can be inhibited against sodium sulfate precipitation by substituting potassium for a portion of the sodium contained in such compounds. A typical concentrate would contain a water-soluble sulfite mixture comprising sodium and potassium sulfite with the sodium to potassium ratio ranging between 1:1 to 15:1.
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: June 30, 1987
    Assignee: Nalco Chemical Company
    Inventor: Leonard Dubin
  • Patent number: 4670163
    Abstract: Halohydroxyalkylthio-substituted an dihydroxyalkylthio-substituted polycarboxylic acids and alkali metal salts thereof are effective corrosion inhibitors for various metal surfaces. In one embodiment, mineral acid compositions such as aqueous hydrochloric acid metal cleaning solutions exhibit diminished corrosiveness when corrosion inhibiting additives of the invention are present in the compositions.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: June 2, 1987
    Assignee: Phillips Petroleum Company
    Inventors: Merlin R. Lindstrom, Rector P. Louthan
  • Patent number: 4664193
    Abstract: A corrosion-inhibiting composition and method of inhibiting corrosion on metal surfaces are described. The composition comprises a reaction product of (a) a first constituent selected from an epoxide having an average of at least about one vicinal epoxide per molecule and a halogenated aliphatic compound having at least one displaceable halogen and (b) a second constituent comprising a dimercaptan. The reaction product in a hydrocarbon diluent is an effective corrosion inhibitor when applied to metal surfaces in highly corrosive environments, and is designed particularly for downhole metal surfaces of oil drilling equipment.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: May 12, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Yulin Wu
  • Patent number: 4663121
    Abstract: The corrosion of metals in contact with corrosive fluids is effectively inhibited by the addition of one or more phenyloxazoles, preferably 2,5-diphenyloxazole.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: May 5, 1987
    Assignee: The Dow Chemical Company
    Inventors: Edwin R. Henson, Joel G. Courtwright
  • Patent number: 4655287
    Abstract: A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises the reaction product of a first component selected from an epoxy resin, an epoxidized alkene and a substrate having at least one displaceable halogen, and a second component comprising a monomercaptan in a hydrocarbon diluent. The composition is applied by contacting the metal surface with the composition. The composition is particularly useful in the treatment of down-well metal surfaces in oil and gas wells to inhibit the corrosion of the metal under highly corrosive conditions, and is effective even in the presence of polymeric permeability control agents such as aqueous polyacrylamides.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: April 7, 1987
    Assignee: Phillips Petroleum Company
    Inventor: Yulin Wu
  • Patent number: 4647429
    Abstract: A corrosion inhibitor for aluminum in aqueous acidic compositions comprising 3-amino-5-alkyl-1,2,4-triazoles and aminotris(methylenephosphonic acid); and a method for its use.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: March 3, 1987
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventor: Josef Penninger
  • Patent number: 4640786
    Abstract: Compositions useful as corrosion inhibitors for high density brines at high temperatures comprise phosphonium salts, such as triphenyldocosyl phosphonium chloride.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: February 3, 1987
    Assignee: The Dow Chemical Company
    Inventors: Mark E. Soderquist, Ramaiah Muthyala, William A. Larson, Peter A. Doty
  • Patent number: 4637833
    Abstract: Hydrocarbyl-substituted sulfinyl and sulfonyl carboxylic acids are effective corrosion inhibitors for surfaces of various metals. In one embodiment, mineral acid compositions such as aqueous hydrochloric acid metal cleaning solutions exhibit diminished corrosiveness when corrosion inhibiting additives of the invention are present in the compositions.
    Type: Grant
    Filed: June 27, 1985
    Date of Patent: January 20, 1987
    Assignee: Phillips Petroleum Co.
    Inventors: Merlin R. Lindstrom, Harold W. Mark
  • Patent number: 4631138
    Abstract: Triazones and triazine thiones are disclosed as corrosion inhibitors for ferrous metals.
    Type: Grant
    Filed: February 7, 1985
    Date of Patent: December 23, 1986
    Assignee: Petrolite Corporation
    Inventors: Marshall E. Johns, Keith D. Strassner, Thomas G. Braga
  • Patent number: 4614600
    Abstract: An anti-corrosive composition is disclosed which comprises the condensate of a polyamine such as diethylenetriamine, triethylenetetramine or aminoethylethanol amine with a 21 or 22 carbon fatty polycarboxylic acid or acid anhydride. The composition may additionally include the condensation products of the above polyamines with either tall oil fatty acids or Rosin S. Propargyl alcohol has been found to enhance the anti-corrosive effects of the composition. The compositions are especially useful in well drilling operations where a strong inorganic acid is used to facilitate crude oil flow.
    Type: Grant
    Filed: October 31, 1984
    Date of Patent: September 30, 1986
    Assignee: Westvaco Corporation
    Inventors: Peter Schilling, David V. Braddon
  • Patent number: 4608191
    Abstract: A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises the reaction product of a first component selected from an epoxy resin, an epoxidized alkene and a substrate having at least one displaceable halogen, and a second component comprising a monomercaptan in a hydrocarbon diluent. The composition is applied by contacting the metal surface with the composition. The composition is particularly useful in the treatment of down-well metal surfaces in oil and gas wells to inhibit the corrosion of the metal under highly corrosive conditions, and is effective even in the presence of polymeric permeability control agents such as aqueous polyacrylamides.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: August 26, 1986
    Assignee: Phillips Petroleum Company
    Inventor: Yulin Wu
  • Patent number: 4588519
    Abstract: A process for inhibiting the corrosion of iron based metals in contact with aqueous systems by incorporating in the aqueous system an effective amount of a composition comprising an inorganic phosphate and a water soluble organic copolymer of acrylamido-sulfonic acid monomers with vinyl carboxylic acid monomers.
    Type: Grant
    Filed: February 25, 1983
    Date of Patent: May 13, 1986
    Assignee: Dearborn Chemical Company
    Inventor: Vincent R. Kuhn
  • Patent number: 4587098
    Abstract: A method of minimizing corrosion deterioration and hydrogen absorption embrittlement of tantalum encountered in performing acid digestion of organic waste matter put in an acid digestion kettle of tantalum containing high temperature high concentration sulfuric acid includes the addition of nitric acid, nitrous acid, nitrates, nitrites and/or nitrogen oxides to the sulfuric acid bath.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: May 6, 1986
    Assignees: Doryokuro Kakunenryo Kaihatsu Jigyodan, Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Katsuyuki Ohtsuka, Ryukichi Mizuno, Hitoshi Miyazaki, Toshio Fukuzuka, Kazutoshi Shimogori, Hiroshi Satoh, Fumio Kami Kubo
  • Patent number: 4578243
    Abstract: This invention relates to compositions of the formula ##STR1## where R is a hydrocarbon, A is alkylene, and Z is S, SO, SO.sub.2, and salts thereof. This invention also relates to uses thereof, for example as microbiocidal agents, corrosion inhibitors, etc.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: March 25, 1986
    Assignee: Petrolite Corporation
    Inventor: Patrick M. Quinlan
  • Patent number: 4559163
    Abstract: This invention relates to non-halogen salts of nitrogen and/or nitrogen-sulfur heterocyclics as corrosion inhibitors for stainless steel-containing systems. These are more effective as corrosion inhibitors when employed in combination with surfactants, preferably of the non-ionic type such as oxyalkylates.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: December 17, 1985
    Assignee: Petrolite Corporation
    Inventor: Patrick M. Quinlan
  • Patent number: 4557838
    Abstract: Metal corrosion by aqueous acid solutions is inhibited by admixture therein of a synergistic additive consisting essentially of:(1) a heterocyclic nitrogen compound or alkylamine,(2) an acetylenic alcohol, and(3) a dialkylthiourea.In certain instances good inhibition against metal corrosion is obtained without the inclusion of the dialkylthiourea in the additive composition.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: December 10, 1985
    Assignee: Air Products and Chemicals, Inc.
    Inventors: James D. Nichols, Richard Derby, Glenn T. von dem Bussche, David A. Hannum
  • Patent number: 4556110
    Abstract: A corrosion-inhibiting composition of matter comprising (1) the reaction mass resulting from the reaction of an .alpha.,.beta.-unsaturated hydrocarbyl nitrile and a metal hydrocarbyl sulfonate, (2) an alcohol, (3) a hydrocarbon diluent, and optionally (4) an epoxy resin. The composition is particularly useful in the treatment of downhole metal surfaces in oil and gas wells for inhibiting the corrosion of the metal.
    Type: Grant
    Filed: August 30, 1984
    Date of Patent: December 3, 1985
    Assignee: Phillips Petroleum Company
    Inventor: Yulin Wu
  • Patent number: 4552672
    Abstract: The present invention relates to a method of acidizing a subterranean formation or well bore employing an acidic solution containing a stabilized corrosion inhibitor composition comprising an inhibiting effective amount of an acetylenic alcohol, a quaternary ammonium compound, an aromatic hydrocarbon, an antimony compound, and a stabilizer which substantially prevents precipitation of solubilized antimony-containing compounds from aqueous solutions.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: November 12, 1985
    Assignee: Halliburton Company
    Inventor: Michael L. Walker
  • Patent number: 4539140
    Abstract: This invention relates to non-halogen salts of nitrogen and/or nitrogen-sulfur heterocyclics as corrosion inhibitors for stainless steel-containing systems. These are more effective as corrosion inhibitors when employed in combination with surfactants, preferably of the non-ionic type such as oxyalkylates.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: September 3, 1985
    Assignee: Petrolite Corporation
    Inventor: Patrick M. Quinlan
  • Patent number: 4536302
    Abstract: A method and composition for reducing the corrosion effect of aqueous mediums such as brines on ferrous metals by incorporating in the brine an effective amount of a mixture of a sulfur compound wherein the oxidation state of the sulfur is zero or less and a reducing sugar.
    Type: Grant
    Filed: June 30, 1983
    Date of Patent: August 20, 1985
    Inventors: John J. Augsburger, R. Keith Darlington
  • Patent number: 4525296
    Abstract: This invention relates to non-halogen salts of nitrogen and/or nitrogen-sulfur heterocyclics as corrosion inhibitors for stainless steel-containing systems. These are more effective as corrosion inhibitors when employed in combination with surfactants, preferably of the non-ionic type such as oxyalkylates.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: June 25, 1985
    Assignee: Petrolite Corporation
    Inventor: Patrick M. Quinlan
  • Patent number: 4522785
    Abstract: This invention involves a process for minimizing corrosion of metals in contact with aqueous acid solutions wherein said process comprises adding to the aqueous acid solution a corrosion inhibiting amount of a dialkylaminomethyl aromatic triazole having the structure: ##STR1## wherein R.sub.1 is from 1 to 4 substituents and is hydrogen, aliphatic of 1 to about 12 carbons, alkoxy of 2 to about 10 carbons, aroxy of 2 to about 10 carbons, or --COOR.sub.4 wherein R.sub.4 is aliphatic of 1 to about 12 carbons; and R.sub.2 and R.sub.3 are the same or different and are alkyl of 1 to about 4 carbons.
    Type: Grant
    Filed: November 4, 1982
    Date of Patent: June 11, 1985
    Assignee: The Sherwin-Williams Company
    Inventor: Michael J. D'Errico
  • Patent number: 4522658
    Abstract: The present invention relates to a method of inhibiting the oxidative effect of an oxidative environment upon a metal surface utilizing a composition comprising an inhibiting effective amount of an acetylenic alcohol, a quaternary ammonium compound, an aromatic hydrocarbon, an antimony compound, and an aqueous fluid. The metal surface to be protected is contacted with the composition whereby a deposit or coating of at least a portion of the composition constituents is formed on the metal surface.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: June 11, 1985
    Assignee: Halliburton Company
    Inventor: Michael L. Walker
  • Patent number: 4517114
    Abstract: The subject invention relates to compositions which inhibit the corrosion caused by CO.sub.2 and H.sub.2 S in the transport and storage of crude oils, which are generally water-in-oil, in particular salt-water-in-oil emulsions. The corrosion inhibitors are mixtures of certain imidazoline or tetrahydropyrimidine derivatives, precursors thereof, or their complexes with sulfur and certain maleinamidic acids.
    Type: Grant
    Filed: August 26, 1983
    Date of Patent: May 14, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Knut Oppenlaender, Karl Stork, Klaus Barthold
  • Patent number: 4500434
    Abstract: A method for inhibiting the precipitation of a scale, such as an iron silicate scale, from a hot aqueous brine solution, such as a geothermal brine, during production and handling of the brine wherein there is injected into the brine a brine-soluble acid in an amount sufficient to lower the pH of the brine from 0.1 to 0.3 pH units.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: February 19, 1985
    Assignee: Union Oil Company of California
    Inventors: John W. Jost, Darrell L. Gallup
  • Patent number: 4498997
    Abstract: The present invention relates to a method of acidizing a subterranean formation or well bore employing an acidic solution containing a corrosion inhibitor composition comprising an inhibiting effective amount of an acetylenic alcohol, a quaternary ammonium compound, an aromatic hydrocarbon and an antimony compound.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: February 12, 1985
    Assignee: Halliburton Company
    Inventor: Michael L. Walker
  • Patent number: 4499006
    Abstract: A series of novel water-dispersible corrosion inhibiting solutions are disclosed which contain a composition which includes the reaction product of an amine mixture and an organic monomer acid mixture. A process for the inhibition of corrosion in aqueous environment is also disclosed. The process is particularly useful for protecting metal surfaces in subterranean petroleum pumping wells.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: February 12, 1985
    Inventors: Frederick W. Valone, Joseph Rutledge
  • Patent number: 4495336
    Abstract: This invention relates to a sulfidic process of inhibiting corrosion which comprises heating a system with a sulfur-containing polycarboxylic acid or derivatives thereof having carboxylic groups attached to adjacent carbons.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: January 22, 1985
    Assignee: Petrolite Corporation
    Inventors: Rudolf H. Hausler, Neil E. S. Thompson
  • Patent number: 4465620
    Abstract: There is provided a composition which inhibits corrosion and copper plate-out during chemical cleaning of a steam or water carrying system. The composition comprises an .alpha.-aminoalkylsulfide and a surface active agent.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: August 14, 1984
    Assignee: Petrolite Corporation
    Inventor: Neil E. S. Thompson
  • Patent number: 4462830
    Abstract: A non-corrosive aqueous solution of a copper nitrate which contains at least 30% by weight of copper nitrate, from 1-5% by weight of boric acid based on the weight of the copper nitrate, and from 0.2-3.0% by weight of EDTA based on the weight of the copper nitrate.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: July 31, 1984
    Assignee: Nalco Chemical Company
    Inventors: Daniel V. Diep, David A. Grattan
  • Patent number: 4450138
    Abstract: This invention relates to the following:(1) An amino-containing composition characterized by polymercapto groups,(2) A polyamino-containing composition characterized by mercapto or polymercapto groups,(3) A composition characterized by the presence ofA. a mercapto or polymercapto groups, andB. a nitrogen-containing group characterized by at least one of the following:1. an amido or a polyamido group,2. a cyclic amidine or a polycyclic amidine group,3. an epihalohydrin-derived amino-containing group.This invention also relates to the use of the above compositions as corrosion inhibitors.
    Type: Grant
    Filed: October 29, 1982
    Date of Patent: May 22, 1984
    Assignee: Petrolite Corporation
    Inventors: Neil E. S. Thompson, Derek Redmore, Bernardus A. Oude Alink, Benjamin T. Outlaw
  • Patent number: 4450137
    Abstract: This invention relates to the following:(1) An amino-containing composition characterized by polymercapto groups,(2) A polyamino-containing composition characterized by mercapto or polymercapto groups,(3) A composition characterized by the presence ofA. a mercapto or polymercapto groups, andB. a nitrogen-containing group characterized by at least one of the following:1. an amido or a polyamido group,2. a cyclic amidine or a polycyclic amidine group,3. an epihalohydrin-derived amino-containing group.This invention also relates to the use of the above compositions as corrosion inhibitors.
    Type: Grant
    Filed: October 29, 1982
    Date of Patent: May 22, 1984
    Assignee: Petrolite Corporation
    Inventors: Neil E. S. Thompson, Derek Redmore, Bernardus A. Oude Alink, Benjamin T. Outlaw
  • Patent number: 4446881
    Abstract: A method for the long-distance transport of a liquid of methanol or a solution of methanol and at least one organic compound other than methanol, under pressure, through a pipeline installation in which the portions of the pipeline installation that contact said liquid consist essentially of carbon steel and/or low alloy steel, the sum of whose metallic components other than Fe is up to 5 wt. %, in which the water content of said liquid is limited to (a) the range of 0 to 35 wt. % if the content of the formate radical in said liquid is up to 0.05 wt. %, (b) the range of 0.25 to 35 wt. % if the content of the formate radical in said liquid is in the range of 0.05 to 2 wt. % and (c) the range of 0 to 35 wt. % if the content of the formate radical in said liquid is in the range of 2 to 3 wt. %, so that said liquid is transported under pressure while the volume ratio of the formate radical to the water content is kept at a ratio that does not permit the presence of more than 3 wt.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: May 8, 1984
    Assignee: Toyo Engineering Corporation
    Inventors: Yasuo Kitamura, Masao Suzuki, Toshio Kubota, Hiroshi Watanabe, Masaaki Tsujimoto
  • Patent number: 4446056
    Abstract: A process of preparing sulfur-containing compositions which comprises reacting hexahydrotriazines, or the precursors thereof, with sulfur or sulfur-containing compounds. The products of the reaction are useful as corrosion inhibitors. Additionally, ketones or the reaction products of ketones and ammonia are reacted with sulfur or sulfur-containing compounds to yield corrosion inhibitors.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: May 1, 1984
    Assignee: Petrolite Corporation
    Inventor: Neil E. S. Thompson
  • Patent number: 4440666
    Abstract: A hydrocarbonaceous liquid stream is modified to contain a minor amount of the amide reaction product of a polyalkylene polyamine, a neo-acid having 5 to 20 carbon atoms, the neo-acid having three alkyl groups on the carbon atom which is in the alpha position relative to the carboxylic group, and an aliphatic fatty acid having 10 to 30 carbon atoms, whereby corrosion of iron and other metals contacted by said stream is significantly reduced.
    Type: Grant
    Filed: August 6, 1982
    Date of Patent: April 3, 1984
    Assignee: Atlantic Richfield Co.
    Inventors: Richard F. Miller, Tony S. Go, George R. Wilson, III
  • Patent number: 4436639
    Abstract: The subject invention relates to salts of polymaleic acids having a molecular weight between 200 and 1500 and to their use in preventing the corrosion of metal caused by hydrogen sulfide and carbon dioxide in water-in-oil emulsions such as crude oil.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: March 13, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Knut Oppenlaender, Karl Stork, Klaus Barthold
  • Patent number: 4435361
    Abstract: A series of novel oil-dispersible corrosion inhibiting solutions are disclosed which contain dicyclopentadiene (3a, 4, 7, 7a-tetrahydro-4, 7 methanoindene) sulfonate salts along with an organic corrosion inhibitor in a low molecular weight solvent. The inhibiting solutions containing dicyclopentadiene sulfonate salts are effective in dramatically reducing corrosion rates in the oil field, especially pitting from hydrogen sulfide.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: March 6, 1984
    Assignee: Texaco Inc.
    Inventors: Michael G. DaGue, Frederick W. Valone
  • Patent number: 4419266
    Abstract: An aqueous composition for inhibiting the corrosion of metals is described. The composition comprises a non-oxidizing acid, and, as a corrosion inhibitor, an effective amount of a 3-dialkylamino-3-(1-ethylpentyl)prop-1-yne.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: December 6, 1983
    Assignee: GAF Corporation
    Inventors: Eugene V. Hort, Lowell R. Anderson, Dru W. Alwani
  • Patent number: 4405493
    Abstract: Corrosion inhibiting particles comprise an inorganic oxide, particularly alumina, having corrosion inhibiting anions, particularly phosphate, chromate or benzoate anions, chemically bound to them. They may be prepared by contacting an oxide containing hydroxyl groups with an acidic solution containing the anions at ambient temperatures. The particles may be incorporated into protective coatings, e.g. paints based on epoxy resins, alkyd resins or chlorinated rubbers, in amounts up to 80% wt based on dry film weight, giving coatings with up to 4.0% corrosion inhibiting anions. Release of the anions is by ion-exchange with other anions e.g. the chloride anions of sea water or salt spray, and does not, as is normal with corrosion inhibiting coatings, depend on water solubility.
    Type: Grant
    Filed: January 15, 1980
    Date of Patent: September 20, 1983
    Assignee: The British Petroleum Company Limited
    Inventor: David A. Pippard
  • Patent number: 4405494
    Abstract: Polyhydroxy-polyalkylene-polyamine salts of maleic amide acids are useful metal corrosion inhibitors for use in water-in-oil emulsions.
    Type: Grant
    Filed: December 10, 1981
    Date of Patent: September 20, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Knut Oppenlaender, Erich Schwartz, Klaus Barthold, Wilhelmus Slotman
  • Patent number: 4404116
    Abstract: Improved liquid, urea-sulfuric acid compositions noncorrosive to stainless steel contain about 5 to about 75 weight percent urea, about 5 to about 85 weight percent sulfuric acid, 0 to about 75 weight percent water and a corrosion inhibiting amount of a cupric ion-containing compound, in which the urea and sulfuric acid together comprise at least about 25 weight percent of the composition, and in which at least a portion of the urea and sulfuric acid are present as monourea sulfate, diurea sulfate or combinations thereof. The compositions may also contain amounts of selected dialkylthioureas sufficient to reduce their corrosivity to carbon steel.
    Type: Grant
    Filed: December 15, 1981
    Date of Patent: September 13, 1983
    Assignee: Union Oil Company of California
    Inventor: Donald C. Young
  • Patent number: 4404167
    Abstract: An antifoaming inhibitor of hydrogen sulphide corrosion which is a compound of the general formula: ##STR1## where R is a divalent normal or branched alkyl containing from 1 to 6 carbon atoms,n=1 or 2;when n=1R' and R" are hydrogen or branched alkyl containing from 1 to 20 carbon atoms, normal or branched alkenyl containing from 3 to 14 carbon atoms, oxyalkyl containing from 1 to 20 carbon atoms, cycloalkyl containing from 5 to 6 carbon atoms,R' and R" are --(CH.sub.2).sub.m --,where m=2-10, --(CH.sub.2).sub.2 --NH--(CH.sub.2).sub.2 --; --(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 --;when n=2R' is hydrogen, normal or branched alkyl containing from 1 to 20 carbon atoms, normal or branched alkenyl containing from 3 to 14 carbon atoms,R' is --(CH.sub.2).sub.k, where k=2-10, --(CH.sub.2).sub.2 --NH--(CH.sub.2).sub.2 --.The proposed inhibitor is effective in acid, weak acid, and alkaline media in a wide range of hydrogen sulphide content.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: September 13, 1983
    Inventors: Iosif L. Rozenfeld, Vera M. Brusnikina, Larisa V. Frolova, Alevtina A. Lyashenko, Jury V. Sokolov, Boris V. Bocharov, Alexandr V. Fokin, Nikolai E. Legezin, Ekaterina V. Dergobuzova, Boris N. Altshuler, Saida A. Zelenaya, Emma S. Korobova
  • Patent number: 4402852
    Abstract: Improved, liquid, urea-sulfuric acid reaction product compositions, noncorrosive to carbon steel, contain about 5 to about 75 weight percent urea, about 5 to about 85 weight percent sulfuric acid, 0 to about 75 weight percent water, and a corrosion inhibiting amount of certain dialkylthioureas, in which the urea and sulfuric acid together constitute at least about 25 weight percent of the composition, the urea/sulfuric acid molar ratio of the composition is greater than 2 or less than 1, and a portion of the urea and sulfuric acid are present as monourea sulfate, diurea sulfate, or combinations thereof. The compositions can also contain corrosion inhibiting amounts of one or more cupric ion-containing compounds sufficient to reduce the corrosivity of the composition to stainless steel.
    Type: Grant
    Filed: December 15, 1981
    Date of Patent: September 6, 1983
    Assignee: Union Oil Company of California
    Inventor: Donald C. Young