Aqueous Acid Environment (i.e.,ph Less Than Or Equal To 4.1) Patents (Class 422/12)
  • Patent number: 7216710
    Abstract: Methods of inhibiting corrosion comprising providing a corrosive environment; adding a corrosion inhibitor comprising a reaction product of a thiol compound and an aldehyde compound. Methods of acidizing a near well bore region of a subterranean formation comprising isolating a zone of interest along a well bore; and placing an acidizing solution in the zone of interest wherein the acidizing solution comprises an acid and a corrosion inhibiting compound comprising the reaction product of a thiol compound and an aldehyde compound.
    Type: Grant
    Filed: February 4, 2004
    Date of Patent: May 15, 2007
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Thomas D. Welton, Juanita M. Cassidy
  • Patent number: 7125483
    Abstract: A method for reducing acid corrosion and products of acid corrosion in a thermal cracking plant, the acid corrosion products being compounds of iron, chromium, nickel, lead, cadmium, manganese, mercury, magnesium, calcium, sodium, copper, zinc, lead, molybdenum, and aluminum, the improvement comprising introducing ethylene diamine into at least one process stream of the plant.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: October 24, 2006
    Assignee: Equistar Chemicals, LP
    Inventor: Robert J. Haynal
  • Patent number: 7008910
    Abstract: An aqueous non-toxic biorational or environmentally safe composition to reduce or inhibit corrosion, rust and scale on metal surfaces comprising effective amounts of sorbic acid, salts of sorbic acid and/or derivatives thereof and a variety of hydrocarbons, esters, acids, alcohols and/or saponified fatty acids or combinations thereof derived from beeswax, vegetable waxes and/or derivatives thereof.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: March 7, 2006
    Inventor: John P. Komar
  • Patent number: 6811747
    Abstract: The present invention relates to water treatment chemical formulations, and more particularly to chemical formulations used to treat water containing halogens as a sanitizing agent. The water treatment chemical formulations contain cyanuric acid and an alkali metal molybdate or silicate as an anticorrosion agent.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: November 2, 2004
    Assignee: Bioquest, LLC
    Inventor: Michael A. Silveri
  • Patent number: 6803057
    Abstract: An acidic aqueous hydrogen peroxide solution is provided with improved disinfectant activity. Concentrated solutions preferably contain up to about 8 wt./wt. % H2O2 and as-used concentrations contain about 0.5% wt./wt. % H2O2. The solution also contains from 0.05 to 8.0 wt./wt. % of at least one phosphorous-based acid, e.g. phosphoric acid and/or a phosphonic acid with from 1 to 5 phosphonic acid groups, and from 0.02 to 5 wt./wt. % of at least one anionic surfactant. The surfactant is selected from C8 to C16 alkyl aryl sulfonic acids, sulfonated C12 to C22 carboxylic acids, C8 to C22 alkyl diphenyl oxide sulfonic acids, naphthalene sulfonic acids, C8 to C22 alkyl sulfonic acids, and alkali metal and ammonium salts thereof, and alkali metal C8 to C18 alkyl sulfates, and mixtures thereof. Most preferably the solution has an emulsifier and/or hydrotrope, e.g. an alkylated sulfonated diphenyl oxide salt, an alkyl aryl polyoxyethylene surfactant, and/or a polyoxyethylene surfactant.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: October 12, 2004
    Assignee: Virox Technologies Inc.
    Inventors: Jose A. Ramirez, Michael J. Rochon
  • Publication number: 20040120847
    Abstract: For decreasing the corrosivity of a water-containing corrosive crude oil mixture, a composition capable of dispersing water in the crude oil is included in the crude oil mixture, such that in use the amount of water at a surface between the crude oil and a corrosion-sensitive material is decreased. Compositions to be used for decreasing the corrosivity of a water-containing corrosive crude oil mixture and applications of the proposed anti-corrosion measures are also described.
    Type: Application
    Filed: December 24, 2002
    Publication date: June 24, 2004
    Inventor: Willem Dijkhuizen
  • Publication number: 20040086419
    Abstract: The present invention is directed toward the use of a reaction product of an alkynediol and a polyalkylene polyamine to inhibit intergranular corrosion of metal surfaces in industrial processing systems caused by spray water mist or condensation.
    Type: Application
    Filed: October 30, 2002
    Publication date: May 6, 2004
    Inventors: Stuart D. Klatskin, Steven Weeden, Dino Colarossi, Chris Austin
  • Publication number: 20040076542
    Abstract: The corrosion of metals in contact with aqueous alkanolamine solutions in acid gas removal units is inhibited by adding to the alkanolamine solution a corrosion inhibiting amount of a polythiaether compound.
    Type: Application
    Filed: October 15, 2002
    Publication date: April 22, 2004
    Inventors: Zen-Yu Chang, Liliana Minevski, Ping Lue
  • Patent number: 6723257
    Abstract: This invention relates to a corrosion inhibiting composition for use in commercial, institutional, and industrial water systems. The compositions comprise a mixture of (1) a fatty acid ester, and (2) a polyethylene glycol ester. These compositions are useful in inhibiting the corrosion of metals such as steel, copper, and brass, which are exposed to water.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: April 20, 2004
    Assignee: Ashland Inc.
    Inventors: Bruce L. Libutti, Joseph Mihelic
  • Patent number: 6676856
    Abstract: The invention provides for improvements in composition and methods for the preservation of cellulosic materials through use of solutions comprising organic multi-valent metal carbonates, C1-C4 alcohol having a moisture content of less than 100 ppm, and 86-99 weight percent of a solvent having a moisture content of less than 100 ppm.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: January 13, 2004
    Inventor: Richard Daniel Smith
  • Publication number: 20030231979
    Abstract: The present invention relates to water treatment chemical formulations, and more particularly to chemical formulations used to treat water containing halogens as a sanitizing agent. The water treatment chemical formulations contain cyanuric acid and an alkali metal molybdate or silicate as an anticorrosion agent.
    Type: Application
    Filed: June 4, 2003
    Publication date: December 18, 2003
    Inventor: Michael A. Silveri
  • Publication number: 20030215353
    Abstract: This invention relates to a process for scale inhibition using random copolymers of acrylic acid and a monomer that is hydrophobic.
    Type: Application
    Filed: May 16, 2002
    Publication date: November 20, 2003
    Inventors: Srideve Narayan-Sarathy, Laurence G. Dammann, Davor Zidovec
  • Patent number: 6645400
    Abstract: The present invention describes an innovative means of inhibiting corrosion of metals which experience active-passive transition in contact with an electrolyte. This invention incorporates hydrogen peroxide and/or peroxycarboxylic acids or their constituents to inhibit corrosion by inducing passivation of the metal. Application of this technology reduces the potential for fouling, scaling and deposition as well as outperforming existing methods of corrosion control in these applications.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: November 11, 2003
    Assignee: United States Filter Corporation
    Inventor: Roy Martin
  • Patent number: 6632294
    Abstract: Corrosion of steel surfaces in a heat pump is inhibited by adding a rare earth metal salt to the heat pump's ammonia/water working fluid. In preferred embodiments, the rare earth metal salt includes cerium, and the steel surfaces are cerated to enhance the corrosion-inhibiting effects.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: October 14, 2003
    Assignee: Advanced Mechanical Technology, Inc.
    Inventors: Florian B. Mansfeld, Zhaoli Sun
  • Patent number: 6623695
    Abstract: An anticorrosive, penetration enhancing composition for cleaning decontaminating and rinsing includes electrochemically activated (ECA) water as the decontamination agent. The anticorrosive decontamination composition has, as the anticorrosive agent, a compound or mixture of compounds capable of inhibiting corrosion of various metals used in sterilization decontamination and rinsing systems and objects such as medical instruments. Preferred anticorrosive compounds include phosphates, azoles, and sulfates. Other additives, including wetting agents, are added to reduce the surface energy of the ECA water. This reduced surface energy permits the ECA water to penetrate into objects of complex design thus permitting complete decontamination of the treated object.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: September 23, 2003
    Assignee: Steris Corporation
    Inventors: Paul S. Malchesky, Christopher M. Fricker
  • Patent number: 6620340
    Abstract: The invention is directed to a method for providing a corrosion inhibiting aqueous solution which includes zinc orthophosphate where the zinc orthophosphate is solubilized. The invention is directed to a method of making a substantially contaminant-free, concentrated aqueous solution of zinc orthophosphate from zinc metal or zinc oxide and aqueous phosphoric acid.
    Type: Grant
    Filed: April 18, 2002
    Date of Patent: September 16, 2003
    Assignee: Carus Corporation
    Inventors: Richard E. Deblois, Kenneth S. Pisarczyk
  • Patent number: 6613249
    Abstract: This invention relates to a corrosion inhibiting composition for use in commercial, institutional, and industrial water systems. The compositions comprise a mixture of (1) a fatty acid ester, and (2) a polyalkylene glycol, preferably polyethylene glycol. These compositions are useful in inhibiting the corrosion of metals such as steel, copper, and brass, which are exposed to water.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: September 2, 2003
    Assignee: Ashland Inc.
    Inventors: Bruce L. Libutti, Joseph Mihelic
  • Patent number: 6605254
    Abstract: The present invention relates to a method of fumigating closed systems susceptible to microbially influenced corrosion (MIC). The method is particularly useful in a method for mitigating MIC in fire protection sprinkler systems.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: August 12, 2003
    Assignee: AlliedSignal Inc.
    Inventors: Anthony Mark Aguilera, Ronald Gordon Bitney, Stephen Alan Conviser, Barbara Ruth Decaire
  • Patent number: 6596175
    Abstract: A method is disclosed to dissolve cupric oxide (CuO) deposits on a strainer in a stator water cooling system (SWCS) of an industrial electrical power generator. The method injects carbon dioxide (CO2) into the coolant to increase the CuO solubility of the coolant. By increasing the solubility, the CuO level in the coolant is less than saturated. The unsaturated coolant dissolves the CuO deposits on the strainer.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: July 22, 2003
    Assignee: General Electric Company
    Inventor: Raymond Grant Rowe
  • Patent number: 6585933
    Abstract: A method and composition for controlling corrosion of metals, particularly ferrous-based metals in contact with aqueous systems is disclosed, which includes treating industrial waters with a combination of a tetrazolium salt of the general formula: where R1, R2 and R3 may be various organic or inorganic substitutents, where n may be 1 or 2, and at least one other aqueous system treatment material.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: July 1, 2003
    Assignee: BetzDearborn, Inc.
    Inventors: William C. Ehrhardt, Longchun Cheng, Dawn Stasney, Kim A. Whitaker
  • Patent number: 6583091
    Abstract: The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of 4-sulfophthalic acid, typically up to 1000 wppm, to the metal surface.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: June 24, 2003
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Guido Sartori, David Craig Dalrymple, Saul Charles Blum, Liza Marie Monette, Mohsen S. Yeganeh, Andreas Vogel
  • Publication number: 20030103865
    Abstract: This invention relates to a corrosion inhibiting composition for use in commercial, institutional, and industrial water systems. The compositions comprise a mixture of (1) a fatty acid ester, and (2) a polyethylene glycol ester. These compositions are useful in inhibiting the corrosion of metals such as steel, copper, and brass, which are exposed to water.
    Type: Application
    Filed: October 29, 2001
    Publication date: June 5, 2003
    Inventors: Bruce L. Libutti, Joseph Mihelic
  • Patent number: 6572789
    Abstract: A method of inhibiting corrosion in aqueous systems comprising adding to the system a composition comprising mono, bis and oligomeric phosphinosuccinic acid adducts and a method of preparing a composition comprising mono, bis and oligomeric phosphinosuccinic acid adducts comprising adding hypophosphite to fumaric acid slurry or solution in water to create a reaction mixture; and effecting a reaction by introducing a free radical initiator to the reaction mixture.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: June 3, 2003
    Assignee: Ondeo Nalco Company
    Inventors: Bo Yang, Peter E. Reed, John D. Morris
  • Patent number: 6558619
    Abstract: A corrosion inhibitor comprising a quantity of a phosphorylated oxyalkylated polyol at a pH of 5.0 or higher which produces a first level of corrosion loss in an oxygenated corrosive system under given conditions, and an amount of a passivating agent effective to decrease the corrosion loss under said given conditions to a second level which is less than the first level. The passivating agent minimizes the impact of the corrosion inhibitor on the rheology of drilling system fluids.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: May 6, 2003
    Assignee: Baker Hughes Incorporated
    Inventors: Michael L. Walker, David J. Poelker, Rich Lloyd Martin
  • Publication number: 20030073242
    Abstract: In a printed circuit board manufacturing process, a resist stripping solution blending organic amines with water is used for stripping the photoresist completely from the board. An apparatus for controlling this resist stripping solution comprises a toroidal conductivity controller for measuring the solution conductivity, which correlates to solution concentration. This same apparatus is equipped with a resist stripping solution discharge device for discharging the resist stripping solution and water replenishing device for replenishing water by detecting the liquid level of the resist stripping solution by a liquid level gauge. As the water is replenished, the solution conductivity is lowered; thereby activating the toroidal conductivity controller to add concentrated resist stripping chemistry proportionally to the deviation from the conductivity controller set point. This same apparatus is equipped with a measuring device for measuring the total consumed organic amine reactants.
    Type: Application
    Filed: October 11, 2001
    Publication date: April 17, 2003
    Inventors: Keith G. Kitchens, James P. Augustine, Terrence D. Krueger
  • Patent number: 6548016
    Abstract: The present invention provides a composition and method for inhibiting hydrogen permeation in metal refinery equipment comprising incorporating into a product stream handled by said equipment a polyamine amide of 3-hydrocarbyl thiopropionic acid in an amount sufficient to inhibit said hydrogen permeation. In a preferred embodiment, the polyamine amide of 3-hydrocarbyl thiopropionic acid is selected from the group consisting of propanamide, N-[2-[2-[3-(dodecenyl)-2,5-dioxo-1-pyrrolidinyl]ethyl]amino]ethyl]-3-[dodecylthio]-2-methyl and 15-thia-5,8,11-triazaheptacosanoic acid, 2-(dodecenyl)-13-methyl-4,12-dioxo, and combinations thereof.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: April 15, 2003
    Assignee: Baker Hughes Incorporated
    Inventor: Bradley G. Borgard
  • Patent number: 6540943
    Abstract: The corrosion of metal equipment which is cleaned with an inorganic acid is inhibited by treating the equipment with a corrosion inhibitor composition containing at least one quaternary ammonium compound, a sulfur-containing compound and a nonionic surfactant in a solvent.
    Type: Grant
    Filed: April 3, 2000
    Date of Patent: April 1, 2003
    Assignee: Ondeo Nadco Company
    Inventors: Duane S. Treybig, Dennis A. Williams
  • Patent number: 6511613
    Abstract: The reaction of propargyl alcohol and iodine gives 2,3di-iodo-2-propen-1-ol, and it has been discovered that this compound is effective as an intermediate in a corrosion inhibitor for metals in acid media, particularly halogen acids. The compound provides iodine to the media in a stable form that does not appear to degrade over time.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: January 28, 2003
    Assignee: Baker Hughes Incorporated
    Inventors: Arthur Cizek, James A. Hackerott
  • Publication number: 20030012685
    Abstract: The invention relates to synergistic mixtures of o-phenylphenol and additional bactericides.
    Type: Application
    Filed: August 23, 2002
    Publication date: January 16, 2003
    Inventors: Peter Wachtler, Martin Kugler
  • Publication number: 20030007888
    Abstract: A method for inhibiting or retarding the corrosion of metals in contact with water solutions containing lithium halide comprises introducing into the solution a crystal habit modifier and lithium molybdate.
    Type: Application
    Filed: April 1, 2002
    Publication date: January 9, 2003
    Applicant: Bromine Compounds Ltd.
    Inventor: David Itzhak
  • Patent number: 6485683
    Abstract: Pyro sulfuric acid is employed to decontaminate air. Contaminated air is contacted with pyro sulfuric acid in a pyro sulfuric acid system, and released as decontaminated air. The system can be especially useful in a chemical/biological/nuclear defense module.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: November 26, 2002
    Inventor: Wilhelm E. Walles
  • Patent number: 6475431
    Abstract: A low toxic, biodegradable, water soluble and dispersant series of corrosion inhibitors are described. The method of inhibiting corrosion in aqueous medium by incorporating the inhibitor in PPM is provided. The corrosion inhibitor compromises an acrylic acid and chloroacetic acid adduct of 2-substituted imidazolines or primary, secondary or tertiary amines with carbon chain of twelve to twenty-two saturated or unsaturated carbon atoms. The molar ratio of acrylic acid to chloroacetic acid was methodically changed while keeping the concentration of imidazoline or the amine a constant. The product is made water soluble by raising the pH to 8-9 at the end of the synthesis by adding aqueous sodium hydroxide.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: November 5, 2002
    Assignee: Champion Technologies, Inc.
    Inventors: Ali Naraghi, Nihal U. Obeyesekere
  • Publication number: 20020150499
    Abstract: The present invention provides compositions of oil-soluble inhibitors suitable for use in inhibiting scale formation in a hydrocarbon production system, such as in an oil field. The compositions comprise an acid form of a known scale inhibitor and 2-ethylhexylamine and similar amines. These compositions possess advantages over conventional compositions used for inhibiting scale formation in that they are less toxic, more biodegradable, and less likely to invade the fatty tissues of marine life.
    Type: Application
    Filed: January 23, 2002
    Publication date: October 17, 2002
    Inventors: James M. Reizer, Michael G. Rudel, Curtis D. Sitz, Rex M. S. Wat, Harry Montgomerie, Andrew Frederick Miles
  • Patent number: 6464901
    Abstract: Non-halogen substituted, nitrogen containing, aromatic compounds are disclosed which are effective copper corrosion inhibitors in aqueous systems being treated with a halogen biocide. The materials of the present invention exhibit copper corrosion inhibition comparable to tolyltriazole in the absence of halogen, copper corrosion rates of less than about 2.5 mills per year in aqueous systems where halogen is present; and do not exhibit a detrimental effect on halogen demand in an aqueous system being treated.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: October 15, 2002
    Inventor: Longchun Cheng
  • Patent number: 6458320
    Abstract: This invention relates to a galvanized metal, typically steel, corrosion inhibitor concentrate comprising (a) an amine salt of a fatty acid or an amine salt of a derivative of a fatty acid, (b) preferably a salt of a non polymeric aromatic acid, and (c) preferably a nonionic or anionic surfactant, and water. The invention also relates to a process for inhibiting corrosion and/or stripping of galvanized steel subjected to acidic conditions, e.g. an amine citrate or citric acid cleaning solution.
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: October 1, 2002
    Assignee: Ashland Inc.
    Inventors: Bruce L. Libutti, Joseph Mihelic
  • Patent number: 6447717
    Abstract: Carbon dioxide induced corrosion of ferrous metals in aqueous systems is inhibited by treatment of the aqueous system with corrosion inhibiting amino thiol and amino disulfide compounds. Particularly effective inhibitors are the natural amino acids cysteine and cystine and their decarboxylated analogues cysteamine and cystamine. Novel corrosion inhibiting compositions comprising a combination of amino thiol or amino disulfide compounds with acidic amino acid polymers are also disclosed.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: September 10, 2002
    Assignee: Donlar Corporation
    Inventors: Joseph C. Fan, Lai-Duien Grace Fan, Jacob Mazo
  • Patent number: 6391384
    Abstract: The invention is directed to a method for providing a corrosion inhibiting aqueous solution which includes zinc orthophosphate where the zinc orthophosphate is solubilized. The invention is directed to a method of making a substantially contaminant-free, concentrated aqueous solution of zinc orthophosphate from zinc metal or zinc oxide and aqueous phosphoric acid.
    Type: Grant
    Filed: July 10, 2000
    Date of Patent: May 21, 2002
    Assignee: Carus Corporation
    Inventors: Richard E. Deblois, Kenneth S. Pisarczyk
  • Patent number: 6379612
    Abstract: The present invention provides compositions of oil-soluble inhibitors suitable for use in inhibiting oil field scale formation. The compositions comprise an acid form of a known scale inhibitor and a tertiary alkyl primary amine. These compositions possess advantages over conventional compositions used for inhibiting oil field scale.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: April 30, 2002
    Assignee: Champion Technologies, Inc.
    Inventors: James M. Reizer, Michael G. Rudel, Curtis D. Sitz, Rex M. S. Wat, Harry Montgomerie
  • Patent number: 6365100
    Abstract: Polymethylenepolyaminedipropionamides are carbonic corrosion inhibitors devoid of toxicity to the marine environment.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: April 2, 2002
    Assignee: CECA, S.A.
    Inventors: Tong Eak Pou, Stephane Fouquay
  • Patent number: 6346279
    Abstract: An acidic aqueous hydrogen peroxid solution is provided, with improved disinfectant activity. Concentrated solutions preferably contain up to about 8% and as-used concentrations contain about 0.5% peroxide. The solution also contains from 0.1 to 5.0% of at least one acid compound, e.g. phosphoric and/or a phosphonate with from 1 to 5 phosphonic acid groups, and from 0.02 to 5% of at least one anionic surfactant. The surfactant is selected from C8 to C16-alkyl aryl sulphonic acids, sulphonated C12 to C22 carboxylic acids, C8 to C22-alkyl diphenyl oxide sulphonic acids, naphthalene sulphonic acids, C8 to C22 alkyl sulphonic acids, and alkali metal and ammonium salts thereof, and alkali metal C8 to C18 alkyl sulphates, and mixtures thereof. Most preferably the solution has an emulsifier, e.g. a salt of an alkylated diphenyl oxide. The solution may also contain corrosion inhibitors and/or lower alcohols.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: February 12, 2002
    Assignee: Virox Technologies, Inc.
    Inventor: Michael J. Rochon
  • Patent number: 6346217
    Abstract: A composition and method for cleaning drink water tanks. The composition contains in combination amidosulfonic acid, nitrilotriacetic acid, isopropanol and water. The composition is applied to deposit which have formed on the walls and other internal surfaces of a drink water tank.
    Type: Grant
    Filed: June 2, 1999
    Date of Patent: February 12, 2002
    Assignee: Water Whole International, Inc.
    Inventor: Christian Schaal
  • Publication number: 20020001536
    Abstract: The present invention is directed to an aqueous amine resin corrosion inhibitor composition and methods of using the same for inhibiting corrosion in equipment in contact with alkanolamine, hot carbonate solutions, diglyme and/or other solvents and acid gases such as carbon dioxide, hydrogen sulfide or a mixture of the two. The inhibitor preferably relates to compositions useful for inhibiting corrosion in environments in contact with alkanolamine, hot carbonate solutions, diglyme, and/or solvent gas treating systems and acid gases, and more particularly, to an amine resin solution made by reacting sterically hindered amines such as those selected from the group consisting of alkyl diamines, alkyltriamines, amino alcohols and mixtures thereof with aldehydes, aldehyde donors, the reaction product of lower alkanolamines and lower aldehydes, and mixtures thereof.
    Type: Application
    Filed: November 17, 1998
    Publication date: January 3, 2002
    Inventors: ROBERT G. ASPERGER, SAADEDINE TEBBAL, RUSSELL D. KANE
  • Patent number: 6303079
    Abstract: The present invention relates to a process for making and a method for using a corrosion inhibitor composition to reduce the corrosion rate of a metal by a fluid containing a corrosion agent. The corrosion inhibitor composition comprises at least a quaternized compound having an amido moiety. An example of the quaternized compound is a quaternized amido imidazoline.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: October 16, 2001
    Assignee: Nalco/Exxon Energy Chemicals, L.P.
    Inventor: George Richard Meyer
  • Patent number: 6261346
    Abstract: A process useful for protecting metal surfaces against corrosion in is presented involving: (a) forming a corrosion inhibitor having a compound corresponding to formula (I): where R1, R2 and R3 independently of one another represent an alkyl or hydroxyalkyl group containing 1 to 4 carbon atoms, an aryl or alkylaryl group or a group corresponding to formula (II): A− is an anion, n is the number 2 or 3, p is a number of 1 to 3 and R5 is an alkyl or alkenyl group containing 7 to 23 carbon atoms and 0, 1, 2 or 3 double bonds, and R4 is a group corresponding to formula (II) or (III): where R1, R2 and R3 are as defined above and Z is a group —(CH2)m— or a group corresponding to formula (IV):  m is an integer of 1 to 6, X is a group NH or an oxygen atom and D is a dimer fatty acid residue containing on average 36 to 54 carbon atoms; (b) combining the corrosion inhibitor with liquid aqueous, liquid non-aqueous or gaseous me
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: July 17, 2001
    Assignee: Cognis Deutschland GmbH
    Inventors: Wolfgang Breuer, Robert Schuetz, Guenther Uphues, Claus-Peter Herold, Rafael Pi
  • Patent number: 6242011
    Abstract: A composition of matter and the method of making that provides a low pH acidic composition that is useful for destroying microorganisms that are undesirable and useful for destroying or reducing melanoma on human skin. The composition and method include sulfuric acid combined with distilled water and ammonium sulfate under at least 15 psi pressure in a pressurized container, all of which is heated to approximately 800° F. or more for at least 3 hours. The final cooled mixture is stabilized with 10 percent of the original mixture. The resultant composition is useful for preserving food, such as fresh fish, and for skin treatment of melanoma.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: June 5, 2001
    Inventor: Barry W. Cummins
  • Patent number: 6187262
    Abstract: A method for controlling corrosion of metals, particularly ferrous-based metals in contact with aqueous systems is disclosed, which includes treating industrial waters with a tetrazolium salt of the general formula: wherein R1, R2 and R3 may be various organic or inorganic substituents, including monomers or oligomers of the above structure.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: February 13, 2001
    Assignee: Betzdearborn Inc.
    Inventors: Longchun Cheng, Kim Whitaker
  • Patent number: 6171521
    Abstract: This invention is directed to a zwitterionic water-soluble imine of formula: wherein R1 is heterocyclyl, heteroaryl, aryl, arylalkyl, cycloalkyl or lower alkyl; R2 is alkyl, alkenyl, aminoalkyl, diaminoalkyl, hydroxyalkyl, alkoxyalkyl, thioalkyl, alkylthioalkyl or arylalkyl; R3 is hydrogen and lower alkyl, or R1 and R3 taken together form a cycloalkyl, p is 2, 3, 4 or 5; and Z is CO2−, OCO2−, SO3−, OSO3−, PO3− or OPO3− which are useful as ferrous metal corrosion inhibitors.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: January 9, 2001
    Assignee: Nalco/Exxon Energy Chemicals, L.P.
    Inventor: G. Richard Meyer
  • Patent number: 6143243
    Abstract: This invention relates to a method of inhibiting the cavitation-erosion corrosion of aluminum surfaces. The method comprises the step of contacting the aluminum surface with a formulation comprising a corrosion inhibitor composition comprising one or more carboxylic acids, or salts or isomers thereof, and a polymerizable-acid graft polymer which comprises an unsaturated grafting acid and an alkylene oxide polymer, or copolymers thereof. This method has been demonstrated to be a surprisingly effective means to inhibit cavitation-erosion corrosion of aluminum surfaces found in the cooling systems of internal combustion engines.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: November 7, 2000
    Assignee: Prestone Products Corporation
    Inventors: Aleksei V. Gershun, Peter M. Woyciesjes
  • Patent number: 6120619
    Abstract: To avoid the corrosion of stainless steels in organosulphonic acid medium, at least one oxidizing agent selected from cerium(IV), iron(III), molybdenum(VI) or vanadium(V) oxides or salts, nitrites and persulphates, is added to the medium in an amount which is sufficient to place the spontaneous potential between the passivation and transpassivation potentials.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: September 19, 2000
    Assignee: Elf Atochem, S.A.
    Inventors: Jean Goudiakas, Guy Rousseau
  • Patent number: 6106770
    Abstract: A method for preventing obstruction in aluminum brass pipes in a water flow path, including the steps of continuously supplying iron ions or an iron ion supply compound to water in the water flow path in such a manner that a concentration of iron ions in the water is 0.005 to 0.05 mg/liter, and supplying hydrogen peroxide or a hydrogen peroxide supply compound for a period of time sufficient for preventing adhesion of organisms to the aluminum brass pipes but not impeditive to formation of corrosion-resistant coating inside the pipes, in such a manner that a concentration of hydrogen peroxide in the water is 0.1 to 1.5 mg/liter, whereby corrosion of aluminum brass pipes and adhesion of organisms to the pipes are prevented.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: August 22, 2000
    Assignees: Mitsubishi Gas Chemical Company Inc., Katayama Chemical Inc.
    Inventors: Keiji Ohki, Kunio Nishimura, Yoshiharu Wakao