Using Organic Compound Having Phosphorus Patents (Class 422/15)
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Patent number: 6379612Abstract: 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: GrantFiled: July 27, 1999Date of Patent: April 30, 2002Assignee: Champion Technologies, Inc.Inventors: James M. Reizer, Michael G. Rudel, Curtis D. Sitz, Rex M. S. Wat, Harry Montgomerie
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Patent number: 6337047Abstract: This invention relates to a process for dispersing corrosion products, specifically iron oxide, in steam generating boilers. Improved dispersion is achieved by adding a dispersant to a feedpoint of the steam generating boiler where the composition comprises: (a) a copolymer of sulfonated styrene and maleic anhydride or maleic acid; and (b) diethylenetriamine penta (methylene phosphonic acid).Type: GrantFiled: October 30, 1998Date of Patent: January 8, 2002Assignee: Ashland Inc.Inventors: Kostan B. Charkhutian, Bruce L. Libutti, Kaj D. Rondum
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Publication number: 20010047221Abstract: Described and claimed is a method of controlling a boiler in which control is based on information from a control Matrix applicable to the specific operating parameters of said boiler.Type: ApplicationFiled: December 13, 2000Publication date: November 29, 2001Inventor: Roger W. Fowee
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Publication number: 20010022947Abstract: Effective corrosion inhibitors having minimal organic content, particularly suitable for use in municipal drinking water systems, are described. The corrosion inhibiting additive is a stannous salt of a non-carbon acid.Type: ApplicationFiled: December 19, 2000Publication date: September 20, 2001Applicant: A.S. IncorporatedInventor: Olen L. Riggs
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Patent number: 6200529Abstract: Effective corrosion inhibitors having minimal organic content, particularly suitable for use in municipal drinking water systems, are described. The preferred corrosion inhibiting additive is an aqueous solution of a stannous halide, preferably stannous chloride.Type: GrantFiled: July 26, 1999Date of Patent: March 13, 2001Assignee: A. S. IncorporatedInventor: Olen L. Riggs, Jr.
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Patent number: 6183649Abstract: Water-circulating systems are treated with an aqueous, alkaline composition comprising I) an organo-phosphorus chelating agent, II) an acrylate homopolymer, III) a salt of an acrylic copolymer, a portion of the repeating units of which contain sulfonate groups, IV) a molybdate salt, and V) a salt of a fused-ring aromatic triazole. This composition (which is formulated in accordance with a specific order of addition of the ingredients) is effective against white rust (corrosion of galvanized metal parts). When the water-circulating system is also fouled with a biofilm, it is preferred to introduce a biofilm remover having biocidal, surfactant, and chelating properties into the system, but the biofilm remover is introduced separately from the above-described composition.Type: GrantFiled: October 7, 1998Date of Patent: February 6, 2001Inventor: Michael W. Fontana
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Patent number: 6180056Abstract: A composition for minimizing biological and/or colloidal fouling is described, which includes an anionic antiscalant and a cationically charged biocide. Further, a method of controlling fouling is described and achieved by introducing a formulation of the present invention into an aqueous system which uses a separation membrane. The compositions used in the present invention are compatible with such separation systems and preferably prevent membrane fouling.Type: GrantFiled: December 10, 1998Date of Patent: January 30, 2001Assignees: Buckman Laboratories International Inc., Betz Dearborn Inc.Inventors: Thomas E. McNeel, Daniel L. Comstock, Maryam Z. Anstead, Richard A. Clark
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Patent number: 6177047Abstract: The invention herein relates to water-treatment technology, namely compositions comprising a phosphonic acid, a zinc salt and a metal salt. A preferred metal salt is aluminum tri-chloride whereas amino tris methylene phosphonic acid is a preferred phosphonic species. The use of the compositions in water-treatment methods is also described.Type: GrantFiled: July 11, 1997Date of Patent: January 23, 2001Inventors: Krzysztof Kuczynski, Michel Alex Omer Ledent
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Patent number: 6090345Abstract: The present invention relates to phosphorus-containing compounds based on 1-hydroxypropane-1,3-diphosphonic acid and to the acid itself of general formula (I) ##STR1## in which M.sup.1, M.sup.2, M.sup.3, M.sup.4 and M.sup.5, independently of one another, each denote a radical from the series hydrogen, alkali metal, an equivalent of ammonium, alkyl- or hydroxyalkyl-substituted ammonium,a process for the preparation thereof, novel intermediates and the use thereof as a corrosion inhibitor, scale inhibitor and as a flame retardant.Type: GrantFiled: January 29, 1999Date of Patent: July 18, 2000Assignee: Bayer AGInventors: Christoph Holzner, Armin Spaniol, Hans Dahmen
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Patent number: 6083403Abstract: This invention relates to novel organic phosphonate compounds which can be used as water treatment agents. More specifically, this invention relates to 1,1 -diphosphonic acid N-oxides and water-soluble salts thereof for control of corrosion and scale in aqueous systems. Preferred N-oxides are morpholinomethane-1,1-diphosphonic acid N-oxide and N,N-dimethylaminomethane-1,1-diphosphonic acid N-oxide.Type: GrantFiled: November 5, 1998Date of Patent: July 4, 2000Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Michael A. Kamrath
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Patent number: 6001264Abstract: A water-treating agent comprising a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/2-hydroxyethyl (meth)acrylate, or a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/(meth)acrylamido-2-methylalkanesulfonic acid ternary copolymer, is effective against scaling and fouling in water systems and a method for treating water with the water-treating agent. When combined with a corrosion inhibitor, the water-treating agent exhibits an excellent anti corrosion effect.Type: GrantFiled: January 29, 1998Date of Patent: December 14, 1999Assignees: Kurita Water Industries Ltd., Japan Synthetic Rubber Co., Ltd.Inventors: Takashi Suzuki, Hideo Morinaga, Katsuhiro Ishikawa, Akihide Hirano
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Patent number: 5980619Abstract: A description is given of compounds of the formula ##STR1## in which the general symbols are as defined in claim 1, and of their zirconium, bismuth and calcium salts, and of the salts with the compounds of the formula II ##STR2## in which the general symbols are as defined in claim 1, as corrosion inhibitors in coating compositions for protecting metallic surfaces.Type: GrantFiled: February 12, 1997Date of Patent: November 9, 1999Assignee: Ciba Specialty Chemicals CorporationInventors: Adalbert Braig, Andreas Kramer, Jean-Pierre Wolf, Markus Frey
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Patent number: 5863415Abstract: Corrosion of iron-containing metal surfaces in a hydrocarbon fluid having a temperature of from about 175.degree. C. to about 400.degree. C. and containing a corrosive amount of naphthenic acid is inhibited by adding to the fluid or to a feed therefor, in a total additive amount sufficient to effect corrosion inhibition in said fluid, one or more thiophosphorus compound, a salt thereof, an alkyl or aryl ester thereof, an isomer thereof, or some combination of the foregoing, thereby to effect inhibition of naphthenic acid induced corrosion in the fluid.Type: GrantFiled: August 28, 1997Date of Patent: January 26, 1999Assignee: Baker Hughes IncorporatedInventor: Michael J. Zetlmeisl
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Patent number: 5858798Abstract: Primary amines, ammonia, or mixtures thereof can be detected using a reagent comprising from about 650 ppm to about 25 percent by weight of phthalic dicarboxyaldehyde; from about 74 to about 99.88 percent by weight of an alkali metal borate; and, from about 550 ppm to about 22 percent by weight of a nucleophile.Type: GrantFiled: July 12, 1996Date of Patent: January 12, 1999Assignee: Nalco Chemical CompanyInventors: Martin R. Godfrey, Donald E. Govoni, Linda M. Link
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Patent number: 5824239Abstract: A method for removing biguanide from aqueous sources, such as swimming pools, is disclosed. The method includes the steps of bringing at least one polymeric metaphosphate into contact with the aqueous source in a sufficient concentration to form particles containing the biguanide. The particles containing at least a portion of the biguanide can then be removed by various means, including filtration or vacuuming.Type: GrantFiled: August 14, 1997Date of Patent: October 20, 1998Assignee: Buckman Laboratories International, Inc.Inventor: Percy A. Jaquess
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Patent number: 5800732Abstract: An all-in-one cooling water treatment composition includes a high concentration of peroxide, preferably hydrogen peroxide, in combination with a polyhydric alcohol and a phosphonate to stabilize the peroxide in a concentrated solution. The composition further includes a yellow metal corrosion inhibitor such as aromatic triazole and optionally polymeric dispersants and ferrous metal corrosion inhibitors and/or molybdate metal corrosion inhibitors. In this composition the phosphonate, preferably HEDP, acts both to stabilize the peroxide and, at the same time, provides anti-scalant treatment for the cooling tower. Due to the stability provided by the HEDP and its anti-scalant properties, this can be formulated as an all-in-one treatment composition which is stable at high concentrations and can be added to effectively control biocidal activity, scale and corrosion.Type: GrantFiled: February 7, 1997Date of Patent: September 1, 1998Assignee: Diversey Lever, Inc.Inventors: Michael F. Coughlin, Lyle H. Steimel
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Patent number: 5788857Abstract: This invention relates to the use of iminoalkylenephosphonic acids to prevent corrosion, including both localized corrosion and general corrosion on iron based metal surfaces in contact with a corrosive system water in an aqueous system. The invention also relates to the use of the iminoalkylenephosphonic acids to control formation, deposition and adherence of scale at the surfaces of metals in contact with a scale-forming system water in an aqueous system.Type: GrantFiled: October 23, 1996Date of Patent: August 4, 1998Assignee: Nalco Chemical CompanyInventors: Bo Yang, Jiansheng Tang
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Patent number: 5785895Abstract: A method for inhibiting corrosion in an aqueous medium is disclosed. The method comprises incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion. The corrosion inhibitor comprises an N-ethoxy, 2-substituted imidazoline, the N-ethoxy substituent having from one to about thirty ethoxy units and the 2-substituent being an unsaturated or polyunsaturated fatty chain of from about six to about thirty carbons. If the medium is sweet, the inhibitor further comprises a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons. Corrosion inhibitor compositions useful in such method are also disclosed.Type: GrantFiled: December 6, 1995Date of Patent: July 28, 1998Assignee: Petrolite CorporationInventors: Richard L. Martin, Jo Ann McMahon, Bernardus A. Oude Alink
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Patent number: 5750070Abstract: A biodegradable corrosion inhibitor, scale inhibitor and dispersant is provided. The inhibitor comprises one or more polymers from a family of poly(amino acid) polymers that include hydroxamic acid-containing sidechains. Methods of reducing corrosion and scale build-up and a method of dispersing solid particulates in a solution or slurry are provided by adding a polymer of the present invention to a solution or slurry.Type: GrantFiled: July 19, 1996Date of Patent: May 12, 1998Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Raymond T. Cunningham, Bo Yang
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Patent number: 5746973Abstract: Odorant depletion is reduced by passivating the internal surface of LP-gas transportation and storage vessels by the addition of passivating agents comprising mixtures of corrosion inhibitors such as phosphate esters, fatty amines, poly amides, imidazolines, poly imidazolines, quaternary amines, poly quats, dimer acids, trimer acids, polymeric acids, ethoxylated fatty amines, ethoxylated polyamides, ethoxylated alcohols and mixtures thereof in one or more solvents. In a preferred embodiment, the passivating agents contain one or more phosphate esters defined by the equation:?R--X--?C.sub.m H.sub.2m O).sub.n !.sub.k --PO(OH).sub.Type: GrantFiled: July 10, 1996Date of Patent: May 5, 1998Inventor: Ali Naraghi
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Patent number: 5731032Abstract: In one aspect, am anti-corrosion treatment method of reducing internal corrosion of a liquid nitrogen fertilizer holding vessel comprising providing at least one quaternary-amine-comprising compound within the vessel. In another aspect, an anti-corrosion treatment method of reducing corrosion of a liquid nitrogen fertilizer holding vessel comprising: a) providing a substantially insoluble liquid film of a quaternary-amine-comprising compound over a volume of liquid nitrogen fertilizer within a steel vessel; and b) coating internal sidewalls of the steel vessel with the quaternary-amine-comprising compound as the volume of liquid fertilizer increases and decreases within the vessel. In another aspect, an anti-corrosion mixture comprising: a) a liquid nitrogen fertilizer solution; and b) a quaternary-amine-comprising compound within the liquid nitrogen fertilizer solution.Type: GrantFiled: July 8, 1996Date of Patent: March 24, 1998Assignee: J.R. Simplot Co.Inventor: Michael L. Orr
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Patent number: 5716529Abstract: A water-treating agent comprising a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/2-hydroxyethyl (meth)acrylate, or a ternary copolymer of conjugated dienesulfonic acid/(meth)acrylic acid/(meth)acrylamido-2-methylalkanesulfonic acid ternary copolymer, is effective against scaling and fouling in water systems and a method for treating water with the water-treating agent. When combined with a corrosion inhibitor, the water-treating agent exhibits an excellent anti corrosion effect.Type: GrantFiled: August 19, 1996Date of Patent: February 10, 1998Assignees: Kurita Water Industries Ltd., Japan Synthetic Rubber Co., Ltd.Inventors: Takashi Suzuki, Hideo Morinaga, Katsuhiro Ishikawa, Akihide Hirano
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Patent number: 5707529Abstract: A method for inhibiting the formation, deposition and adherence of scale forming salts including calcium carbonate and calcium phosphate in an aqueous system having a pH of at least 8.5 and a calcite saturation level of at least 100 times the solubility limit of calcium as calcite, including adding to the aqueous system a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenoxymethallyl ether and maleic acid, (C) a hydroxyphosphonoacetic acid, and (D) a phosphonocarboxylic acid copolymer.Type: GrantFiled: September 24, 1996Date of Patent: January 13, 1998Assignee: Calgon CorporationInventors: Jasbir S. Gill, Jennifer R. Parsons
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Patent number: 5702768Abstract: The invention encompasses methods of preventing corrosion of vessel sidewalls. In one aspect, the invention includes an anti-corrosion treatment method of reducing internal corrosion of an ammonium phosphate holding vessel comprising providing at least one quaternary-amine-comprising compound within the vessel. In another aspect, the invention includes a treatment method of reducing corrosion of a vessel sidewall surface comprising utilization of a quaternary amine to form a protective layer on the vessel sidewall surface. In another aspect, the invention includes an anti-corrosion treatment method of reducing corrosion of a vessel comprising: a) flowing a liquid into the vessel; b) adding at least one compound to the liquid, the compound being added to a concentration which exceeds the solubility of the compound in the liquid; and c) coating the compound onto an internal surface of the vessel to form a protective layer over the internal surface.Type: GrantFiled: October 29, 1996Date of Patent: December 30, 1997Assignee: J. R. Simplot Co.Inventor: Michael L. Orr
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Patent number: 5693290Abstract: A method and composition for controlling corrosion of metals in contact with an aqueous system is disclosed, which method includes introducing into the aqueous system a sufficient amount of a substantially zinc-free treatment comprising a phosphate compound, and glucoheptonic acid or a water soluble salt thereof.Type: GrantFiled: April 26, 1996Date of Patent: December 2, 1997Assignee: BetzDearborn Inc.Inventors: Stephen M. Kessler, Roger C. May
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Patent number: 5683588Abstract: A method for stabilizing an aqueous solution containing sulfite or bisulfite ions and a water-soluble metal catalyst. The method comprises incorporating a stabilizing amount of a alpha substituted carboxylic acid or salt thereof or a vinyl carboxylic acid or salt thereof in the solution. The carboxylic acid inhibits sludge formation when the aqueous solution is stored. The preferred carboxylic acid, citric acid, also enhances the oxygen scavenging rate of the sulfite and bisulfite when the solution is used to treat aqueous systems for oxygen removal.Type: GrantFiled: September 21, 1995Date of Patent: November 4, 1997Assignee: BetzDearborn Inc.Inventors: Gregory J. Pomrink, Bruce K. Fillipo, Eric R. Carver, Paul R. Burgmayer
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Patent number: 5670055Abstract: The invention comprises a method for dispersing biofilms caused by the growth of slime-forming bacteria and other microorganisms in industrial process water. The method comprises adding an effective biofilm dispersing amount of a linear alkylbenzene sulfonate to the industrial process water which contains slime-forming bacteria and other microorganisms. In addition, an alternative embodiment of the invention comprises adding a compound selected from the group consisting of peracetic acid, glutaraldehyde, isothiazolone, methylene bisthiocyanate, thiocyanomethylthio benzothiazole, 2-bromo-2-nitro-1,3-propane diol, dibromonitrilopropane diol, tetralcishydroxy methyl phosphonium sulfate, decylthioethane amine, alkyl dimethyl benzyl ammonium chloride and combinations thereof.Type: GrantFiled: August 8, 1996Date of Patent: September 23, 1997Assignee: Nalco Chemical CompanyInventors: F. Philip Yu, William F. McCoy
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Patent number: 5662803Abstract: The invention is a method for increasing the effectiveness of water-soluble polymeric additives or water-soluble phosphonates in the recirculating water of processing equipment wherein said water contains ozone and water-soluble polymeric additives or water-soluble phosphonates comprising the step of adding an effective amount of a stabilizer to said waters. The invention is also a method for increasing the effectiveness of ozone treatment in the recirculating waters of processing equipment wherein said water contains ozone and water-soluble additives comprising the step of adding an effective amount of a stabilizer to said waters.Type: GrantFiled: April 9, 1996Date of Patent: September 2, 1997Assignee: Nalco Chemical CompanyInventor: Paul R. Young
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Patent number: 5611992Abstract: The present invention relates to blends of individual corrosion inhibitors with phosphate esters for protection of ferrous metals against attack by a corrosive environment. These blends are synergistically more effective than each of the individual corrosion inhibitors. The phosphate esters of the present invention are the reaction products of ethoxylated, propoxylated, or butoxylated alcohols or phenols with phosphating agents. Other corrosion inhibitors suitable for blending with the phosphate esters include fatty amines, poly amides, imidazolines, poly imidazolines, quaternary amines, poly quats and dimer, trimer, and polymeric acids. Phosphate esters may comprise any portion of the total amount of corrosion inhibitors in the blend, but the preferred concentration is from about 5 to about 50 weight percent phosphate ester. The corrosion inhibitor blends may be diluted to any concentration with solvents or other fluids as necessary for particular applications.Type: GrantFiled: January 17, 1996Date of Patent: March 18, 1997Assignee: Champion Technologies Inc.Inventors: Ali Naraghi, Nick Grahmann
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Patent number: 5611991Abstract: The present invention relates to a specific type of phosphate ester that is as effective or more effective than corrosion inhibitors available in the past. In accordance with the invention, these corrosion inhibitors are highly effective alone or when blended with other specific compounds for protection of ferrous metals against attack by a corrosive environment. More particularly, the inhibitors of the present invention are the reaction products of ethoxylated, propoxylated, or butoxylated alcohols or phenols with phosphating agents.Type: GrantFiled: January 17, 1996Date of Patent: March 18, 1997Assignee: Champion Technologies, Inc.Inventor: Ali Naraghi
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Patent number: 5603840Abstract: The invention comprises adding bromide to a cooling water system containing corrosion and scale control treatment chemicals at elevated concentrations (40 ppm or greater). A fraction of the recirculating water is drawn off in a side stream and ozonated. Ozone oxidizes bromide to bromine which then serves as a biocide. The bromide levels are chosen such that the ozone/bromide reaction is preferred over the ozone/treatment chemicals reaction. Thus, the addition of bromide at elevated concentrations, while acting as a biocide precursor, serves to protect treatment chemicals necessary for corrosion and scale control.Type: GrantFiled: May 15, 1995Date of Patent: February 18, 1997Assignee: Nalco Chemical CompanyInventors: Richard J. Strittmatter, Narasimha M. Rao
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Patent number: 5593595Abstract: An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, (B) a terpolymer comprising the monomers of acrylic acid, sulfophenomethallyl ether and maleic acid, and (C) a hydroxyphosphonoacetic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.Type: GrantFiled: October 6, 1995Date of Patent: January 14, 1997Assignee: Calgon CorporationInventor: Jasbir S. Gill
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Patent number: 5589106Abstract: The prevention of corrosion on the surfaces of metallic pipes, heat exchangers, and the like which are in contact with industrial cooling waters, and particularly industrial cooling waters containing low levels of hardness is controlled utilizing a corrosion inhibiting amount of a composition including an alkali metal silicate, a hydroxycarboxylic acid or its water soluble salts, an organophosphonate, and a water soluble polymer which acts as a dispersant. Superior corrosion inhibition is achieved using the compositions of this invention as corrosion inhibitors, particularly in cooling water systems employing mild steel metallurgy.Type: GrantFiled: February 14, 1995Date of Patent: December 31, 1996Assignee: Nalco Chemical CompanyInventors: Sang-Hea Shim, Dennis P. Bakalik, Donald A. Johnson, Bo Yang, Frank F. Lu
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Patent number: 5580462Abstract: An aqueous system containing scale forming salts including both calcium carbonate and calcium phosphate and characterized by high pH and high calcite concentrations which further contains a synergistic effective amount of a combination comprising (A) a polyether polyamino methylene phosphonate, and (B) a terpolymer comprising the monomers of acrylic acid, sulfophenomethallyl ether and maleic acid, is disclosed. A method for inhibiting the formation, deposition and adherence of such scale forming salts in the aqueous system employing the synergistic combination is also provided.Type: GrantFiled: October 6, 1995Date of Patent: December 3, 1996Assignee: Calgon CorporationInventor: Jasbir S. Gill
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Patent number: 5578246Abstract: This invention relates to a metal corrosion inhibiting composition comprising in admixture: (a) an anodic silicate salt; (b) a silicate salt stabilizer; (c) a cathodic corrosion inhibitor; and water. Preferably, the corrosion inhibiting composition also contains a polymeric scale inhibitor. The invention also relates to a process for treating an open aqueous system with the corrosion inhibiting composition.Type: GrantFiled: October 3, 1994Date of Patent: November 26, 1996Assignee: Ashland Inc.Inventor: Edward S. Beardwood
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Patent number: 5575920Abstract: A method for simultaneously controlling the deposition of scale and the formation of corrosion in a cooling water system consisting of adding to the system a water soluble copolymer having the structure: ##STR1## wherein R.sub.1 is H or lower (C.sub.1 -C.sub.4) alkyl, F is H.sub.2 or O, M is a water soluble cation, R.sub.2 is (CH.sub.2 --CH.sub.2 --O).sub.n, ##STR2## or mixture of both, n is an integer of from 1 to about 40, R.sub.3 is H, lower (C.sub.1 -C.sub.4) alkyl or an acetate.Type: GrantFiled: September 18, 1995Date of Patent: November 19, 1996Assignee: BetzDearborn Inc.Inventors: Donald T. Freese, Libardo A. Perez, Keith A. Bair, Fu Chen
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Patent number: 5562830Abstract: A method of inhibiting corrosion and scale formation and deposition in aqueous systems by adding a combination of a polyepoxysuccinic acid or salts thereof and a phosphonocarboxylic acid or salts thereof.Type: GrantFiled: September 14, 1995Date of Patent: October 8, 1996Assignee: Betz Laboratories, Inc.Inventors: Davor F. Zidovec, Preetha M. Prabhu
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Patent number: 5534157Abstract: A method for inhibiting the formation, deposition, and adherency of scale-forming salts, including calcium sulfite, in process waters. The method is particularly suited for use in pulp mill lime kiln flue gas scrubber systems and multi-effect evaporators. Additionally, the method is effective at high pH and high calcium sulfite saturation levels.Type: GrantFiled: November 10, 1994Date of Patent: July 9, 1996Assignee: Calgon CorporationInventors: Craig D. Iman, Robert E. Tomilson
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Patent number: 5518629Abstract: A method of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a scale/corrosion inhibitor in combination with a substituted alkylpolycarboxylate is employed. The scale/corrosion inhibitor can be a phosphonate such as hydroxyethylidene diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, hydroxyphosphonoacetic acids, amino phosphonates; terpolymers, copolymers and homopolymers of acrylic acid, maleic acid, epoxysuccinic acids such as polyepoxysuccinic acid or mixtures thereof. The substituted alkylpolycarboxylates are compounds of the general structure: R--X--Y.sub.n wherein R is a hydrocarbon functionality having 4 to 18 carbons; X, when present, is --NH--, --NY.sup.1 --, --N-->O, --N--OC--Y.sup.1, --O-- or --S--; n is greater than or equal to 1; and Y and Y.sup.Type: GrantFiled: November 29, 1994Date of Patent: May 21, 1996Assignee: Betz Laboratories, Inc.Inventors: Libardo A. Perez, William S. Carey, Donald T. Freese, Judith B. Rockett
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Patent number: 5419845Abstract: A coolant or antifreeze composition has one or more glycols or glycol ethers in combination with water, one or more additives, and an effective amount of one or more perfluoro-gem-diphosphonates as corrosion inhibitors.Type: GrantFiled: March 15, 1994Date of Patent: May 30, 1995Assignee: BASF CorporationInventors: Stanley T. Hirozawa, David E. Turcotte, Michael C. Welch, Michael A. Reynolds
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Patent number: 5415783Abstract: A method for increasing the effectiveness of ozone as a treating agent for alkaline cooling tower waters. This is accomplished by reducing pH of the solutions in contactor loops which supply ozone to cooling tower waters with an acidic substance.Type: GrantFiled: December 13, 1993Date of Patent: May 16, 1995Assignee: Nalco Chemical CompanyInventors: Donald A. Johnson, Richard J. Strittmatter, Binaifer S. Khambatta
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Patent number: 5407597Abstract: A white rust inhibiting composition and method of inhibiting white rust for evaporative water coolers are disclosed. The composition includes in combination a blend of one or more organophosphorus compounds, one or more carbamate compounds, and one or more water soluble metal compounds.Type: GrantFiled: April 22, 1994Date of Patent: April 18, 1995Assignee: Fremont Industries, Inc.Inventors: Bruce D. Busch, Michael Oldsberg
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Patent number: 5376331Abstract: A method of inhibiting the pitting corrosion rate of carbon steel in a cooling tower system comprising adding to a cooling tower water an effective amount of a corrosion inhibiting composition containing from about 1 to about 10 ppm of a water soluble molybdate, calculated as molybdate and from about 5 to about 25 ppm of a stabilized phosphate, calculated as phosphate, the corrosion inhibiting composition being substantially free of active zinc, and circulating the water in the system.Type: GrantFiled: April 16, 1993Date of Patent: December 27, 1994Assignee: Gulf Coast Performance Chemical, Inc.Inventors: Bradley A. Bucher, Jesse H. Jefferies
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Patent number: 5368773Abstract: A substantially 100% active aqueous solution of one or more phosphonocarboxylic acids and one or more hydroxides, wherein the solution has a slightly alkaline pH. In an alternate embodiment, a dry, free flowing mixture comprising one or more phosphonocarboxylic acids, calcium chloride fines which, on average, are a dihydrate, and hydroxide is disclosed.Type: GrantFiled: April 29, 1993Date of Patent: November 29, 1994Assignee: Anco Chemicals Inc.Inventor: John Humphrey
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Patent number: 5360550Abstract: A method of inhibiting the precipitation of barium scale from an aqueous system, comprising adding to the aqueous system a product having the formula I: ##STR1## in which M is hydrogen or an alkali metal ion, an ammonium ion or a quanternized amine radical; R.sub.1 is hydrogen or methyl; and n is an integer having an average value ranging from 4 to 20.Type: GrantFiled: November 18, 1993Date of Patent: November 1, 1994Assignee: FMC CorporationInventors: Brian G. Clubley, Jan Rideout
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Patent number: 5358642Abstract: Polyether polyamino methylene phosphonates possess high calcium tolerance and have been found to give excellent inhibition of the formation, deposition and adherence of scale-forming salts, especially calcium carbonate, under severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate.Type: GrantFiled: September 18, 1992Date of Patent: October 25, 1994Assignee: Calgon CorporationInventors: Shih-Ruey T. Chen, Gary F. Matz
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Patent number: 5356548Abstract: Compounds of the formula ##STR1## wherein X is an anion selected from the group consisting of phosphate, borate and molybdate groups, and a method for making these compounds. The compounds are useful in the control of microorganisms in aqueous systems and in the inhibition of corrosion of metal surfaces in contact with aqueous systems.Type: GrantFiled: April 28, 1993Date of Patent: October 18, 1994Assignee: Buckman Laboratories International, Inc.Inventors: John D. Pera, S. Rao Rayudu
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Patent number: 5352408Abstract: A coolant or antifreeze composition has one or more glycols or glycol ethers in combination with water, one or more additives, and an effective amount of 1-hydroxyoctylidene-1,1-diphosphonic acid or 1-hydroxydodecylidene-1,1-diphosphonic acid as a corrosion inhibitor.Type: GrantFiled: October 30, 1991Date of Patent: October 4, 1994Assignee: BASF Corp.Inventors: Stanley T. Hirozawa, David E. Turcotte, Michael C. Welch
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Patent number: 5342548Abstract: Methods are provided for inhibiting the corrosion of iron and iron-containing methods in contact with aqueous systems. Trisodium salt of 2,4,6-trimercapto-5-triazine is added to cooling water systems to inhibit the corrosion of these metal surfaces.Type: GrantFiled: September 23, 1993Date of Patent: August 30, 1994Assignee: Betz Laboratories, Inc.Inventors: William J. Yorke, Edmund J. Bockowski
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Patent number: RE36291Abstract: A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R.sup.2 .paren open-st.OCH.sub.2 CH.sub.2 .paren close-st..sub.x, wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.Type: GrantFiled: December 12, 1995Date of Patent: September 7, 1999Assignee: Baker Hughes IncorporatedInventor: Richard L. Martin