Nitrogen Containing Patents (Class 210/700)
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Patent number: 6391207Abstract: A method for reducing or preventing the formation of scale in a municipal or industrial waste water treatment facility comprising introducing an antiscalent composition which comprises: A) A water soluble polymer of molecular weight below 20,000 and containing anionic groups, and B) A sequesterant compound, selected from the group consisting of phosphonates, phosphates, metaphosphates and orthophosphates including derivatives and salts thereof. Preferred antiscalent compositions include a blend of A) a polymer of acrylic acid and/or maleic acid and B) diethylentriamine penta (methylenephosphonic acid) or salts thereof. The invention is of particular value for the treatment of struvite scale in sewage treatment works.Type: GrantFiled: February 29, 2000Date of Patent: May 21, 2002Assignee: Ciba Specialty Chemicals Water Treatments Ltd.Inventor: Jean Achille Emile Robert Cluyse
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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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Patent number: 6264839Abstract: Phosphonomethylated poly-vinylamines which contain as characteristic structural elements units of the formula where R1 is hydrogen, C1-C6-alkyl or and X is hydrogen, an alkali metal, ammonium or one equivalent of an alkaline earth metal, are obtainable by phosphonomethylation of polymers which contain N-vinyl-amide or vinylamine groups and are useful as detergent additives and water treatment agents.Type: GrantFiled: July 12, 1993Date of Patent: July 24, 2001Assignee: BASF AktiengesellschaftInventors: Juergen Mohr, Knut Oppenlaender, Walter Denzinger, Heinrich Hartmann, Richard Baur, Charalampos Gousetis, Alexander Kud
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Patent number: 6207079Abstract: This invention relates to a scale inhibiting composition for aqueous systems comprising (a) polyaspartic acid, and (b) a water soluble phosphonated oligomer. The compositions are effective scale and/or corrosion inhibitors, but are also advantageous from an environmental standpoint because they are non-toxic, contain no heavy metals, and have little or no phosphorus. They also have sufficient calcium/hardness tolerance, are chlorine/bromine stable, and are effective corrosion inhibitors.Type: GrantFiled: January 28, 1999Date of Patent: March 27, 2001Assignee: Ashland Inc.Inventors: Pavol Kmec, Dwight E. Emerich
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Patent number: 6187195Abstract: The invention relates to the use of polyaspartic acids and their mixtures with surfactants and emulsifiers for inhibiting or delaying deposit formation by sparingly soluble organic and inorganic components in the feed of a process that uses a membrane.Type: GrantFiled: May 10, 1999Date of Patent: February 13, 2001Assignee: Bayer AGInventors: Wolfgang Zarges, Torsten Groth, Winfried Joentgen, Andreas Gröschl
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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: 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: 6077440Abstract: A method of controlling the deposition of silica-containing scales and their adhesion to surfaces in contact with an aqueous system is disclosed which comprises adding to the aqueous system a synergistic combination of:(a) diethylenetriamine penta methylene phosphonic acid; and(b) a material selected from the group consisting of 2 phosphonobutane-1,2,4-tricarboxylic acid; high molecular weight, 3:1, acrylic acid/allylhydroxypropylsulfonate ether copolymer; ethylene oxide-propylene oxide block copolymers; and polyepoxysuccinic acid and salts thereof.Type: GrantFiled: June 30, 1998Date of Patent: June 20, 2000Assignee: BetzDearborn Inc.Inventors: Donald C. Roe, Bradley J. Utzka
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Patent number: 6066260Abstract: In the present state of art, use is made of aqueous mixtures of sodium phosphates, preferably mixtures of pentasodium triphosphate (for softening) and sodium dihydrogen phosphate (to reduce the pH) of hard and slightly alkaline water in aquaria to values acceptable especially for ornamental tropical fish. This inherently effective preparation for softening and acidifying the aquarium water leads, however, to the clouding of the water after a short time and to chalk flocculation, while the hydrolysis of the triphosphate results in an increased level of orthophosphate which is particularly favorable to the growth of algae. The invention prevents these drawbacks by the use of phosphonic acid compounds which complex the alkaline earth metal ions determining the hardness of water. Preferred phosphonic acids here are ethylene diamine tetra(methylene phosphonic acid) and its pentasodium salt and diethylene triamine penta(methylene phosphonic acid) and its heptasodium salt.Type: GrantFiled: December 16, 1996Date of Patent: May 23, 2000Assignee: Amtra Aquaristik GmbHInventor: Markus Biffar
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Patent number: 6036740Abstract: Concentrated aqueous gypsum slurries containing small amounts of water soluble phosphonates are non-clogging when used in drip irrigation systems.Type: GrantFiled: February 9, 1998Date of Patent: March 14, 2000Inventors: John C. Miller, Deborah L. Miller
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Patent number: 5866032Abstract: A composition for of controlling scale formation and deposition and corrosion in aqueous systems is described wherein a treatment solution of a substoichiometric amount of a composition comprising 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.sub.m --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; m=O or 1; and Y and Y.sup.Type: GrantFiled: November 18, 1997Date of Patent: February 2, 1999Assignee: BetzDearborn Inc.Inventors: William S. Carey, Libardo A. Perez, Donald T. Freese, Judith L. Barron
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Patent number: 5858244Abstract: A biodegradable scale inhibitor and dispersant is provided. The scale inhibitor includes a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers. A method of reducing scale build-up on heating exchanger surfaces that come in contact with an industrial water is provided by adding a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers to the water system such as cooling towers.Type: GrantFiled: October 6, 1997Date of Patent: January 12, 1999Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Ronald V. Davis
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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: 5783524Abstract: Glycine-N,N-diacetic acid derivatives and their alkali metal, akaline earth metal, ammonium and substituted ammonium salts, used as completing agents for alkaline earth metal and heavy metal ions in the production and transport of petroleum and natural gas.Type: GrantFiled: December 5, 1995Date of Patent: July 21, 1998Assignee: BASF AktiengesellschaftInventors: Thomas Greindl, Wilhelmus Slotman
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Patent number: 5776875Abstract: A biodegradable scale inhibitor and dispersant is provided. The scale inhibitor includes a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers. A method of reducing scale build-up on heating exchanger surfaces that come in contact with an industrial water is provided by adding a copolymer comprising at least one of N-oxygenatedhydrocarbonamide monomers and at least one of amino acid monomers to the water system such as cooling towers.Type: GrantFiled: July 16, 1996Date of Patent: July 7, 1998Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Ronald V. Davis
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Patent number: 5772893Abstract: The invention is a method for the prevention of scale formation on metal or other surfaces in contact with scale-forming industrial water with an effective scale-inhibiting amount of an ether 1,1-diphosphonate of the general formula: ##STR1## The invention is also a method for the prevention of corrosion on metal surfaces in contact with corrosive industrial water with an effective corrosion-inhibiting amount of an ether 1,1-diphosphonate of the same general formula. A preferred ether 1, 1-diphosphonate is 1,1, diphosphono-4,7-dioxaoctane for both methods.Type: GrantFiled: August 13, 1996Date of Patent: June 30, 1998Assignee: NALCO Chemical CompanyInventors: Peter E. Reed, Michael A. Kamrath, Phillip W. Carter, Ronald V. Davis
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Patent number: 5772913Abstract: 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, sulfophenoxymethallyl ether and maleic acid, (C) a hydroxyphosphonoacetic acid, and (D) a phosphonocarboxylic acid copolymer comprising the monomers of acrylic acid, telomer with (1-hydroxy-1-methylethyl) phosphinic acid monosodium salt, and 2-acrylamido 2 methylpropane sulfonic 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: September 24, 1996Date of Patent: June 30, 1998Assignee: Calgon CorporationInventors: Jasbir S. Gill, Jennifer R. Parsons
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Patent number: 5709814Abstract: 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 20, 1998Assignee: Calgon CorporationInventor: Jasbir S. Gill
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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: 5702634Abstract: 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 30, 1997Assignee: Calgon CorporationInventor: Jasbir S. Gill
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Patent number: 5681479Abstract: Phosphonic coletomers of the formula I: ##STR1## wherein X.sub.5 is hydrogen, an alkali metal atom, an alkaline earth metal atom, or an ammonium or amine residue; and A.sub.2 is a copolymer residue comprising two different residues ##STR2## wherein r is an integer ranging from 2 to 100, and wherein, in the first residue, W.sub.3 is --COOH, and in the second residue, W.sub.3 is --CONHC(CH.sub.3).sub.2 CH.sub.2 SO.sub.3 X.sub.5 wherein X.sub.5 is as hereinbefore defined. The cotelomers inhibit scale and corrosion in aqueous systems.Type: GrantFiled: June 7, 1995Date of Patent: October 28, 1997Assignee: FMC Corporation (UK ) LimitedInventors: Elizabeth A. Kerr, Jan Rideout
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Patent number: 5647995Abstract: An improved method is disclosed for the preparation of novel alkali metal diphosphinate salts by the reaction of an acetylenic compound with an alkali metal hypophosphite in the presence of a free radical source, the use of these novel compounds in further reactions to prepare diphosphonate compounds and diphosphinate containing adducts, oligomers and polymers and utilization of these compounds, polymers and oligomers to control calcium carbonate scale and mild steel corrosion in cooling water.Type: GrantFiled: April 29, 1994Date of Patent: July 15, 1997Assignee: Nalco Chemical CompanyInventors: James F. Kneller, Donald A. Johnson, Vytas Narutis, Binaifer S. Khambatta
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Patent number: 5645756Abstract: The tendency of aqueous solutions of urea and other NH-containing compositions to force instability of hardness factors has been found to be detrimental to processes and apparatus employing them. The reliability of these processes and apparatus is improved by the inclusion of hardness-suppressing compositions, which preferably include both a water-soluble polymer and a phosphonate. In particular, agricultural and NO.sub.x -reducing applications are improved, especially for solutions containing urea hydrolysis products and the salts of them.Type: GrantFiled: June 7, 1995Date of Patent: July 8, 1997Assignee: Nalco Fuel TechInventors: Leonard Dubin, W. Robert Epperly, Barry Normand Sprague, Thure von Harpe
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Patent number: 5643462Abstract: Tannin containing polymers, their method of production and methods of using as water treatment agents are disclosed. The tannin containing polymers comprise copolymers of tannin and a cationic monomer. Another embodiment comprises tannin containing polymers of tannin, cationic monomer and at least one monomer selected from the group consisting of an anionic monomer and a nonionic monomer.Type: GrantFiled: May 20, 1994Date of Patent: July 1, 1997Assignee: BetzDearborn Inc.Inventors: Jen-Chi Chen, Fu Chen, Gerald C. Walterick, Jr., Stephen R. Vasconcellos
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Patent number: 5629385Abstract: This invention is directed to certain novel N-functionalized polyallylamines having recurring units represented by the formula: ##STR1## wherein A, B, C and D are independently selected from the group consisting of hydrogen, CH.sub.2 PO.sub.3 H.sub.2, (CH.sub.2).sub.n COOH, (CH.sub.2).sub.m SO.sub.3 H and water-soluble salts thereof, wherein n=1 to 4, m=1 to 4, X is 1 to 99 mol %, Y is 1 to 99 mol % and X+Y=100 and with the proviso that when A is hydrogen, B is (CH.sub.2).sub.n COOH, or (CH.sub.2).sub.m SO.sub.3 H and at least one of C and D is CH.sub.2 PO.sub.3 H.sub.2 or (CH.sub.2).sub.m SO.sub.3 H, when A is (CH.sub.2).sub.n COOH, at least one of B, C and D is CH.sub.2 PO.sub.3 H.sub.2 or (CH.sub.2).sub.m SO.sub.3 H and when A is CH.sub.2 PO.sub.3 H.sub.2, at least one of B, C or D is (CH.sub.2).sub.n COOH or (CH.sub.2).sub.m SO.sub.3 H. The compositions of this invention are useful in water treatment to inhibit or remove scale deposits.Type: GrantFiled: November 23, 1994Date of Patent: May 13, 1997Assignee: BetzDearborn Inc.Inventor: Lawrence L. Kuo
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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: 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: 5565106Abstract: Polyether polyamino methylene phosphonates, which 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, in aqueous systems involving severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate, are degraded by the oxidizing biocides bromine and chlorine used to control microbial growth in such aqueous systems. It has been found that organic sulfonamides provide excellent protection against such degradation when they are added to the aqueous system along with the polyether polyamino methylene phosphonate scale inhibitors.Type: GrantFiled: April 20, 1995Date of Patent: October 15, 1996Assignee: Calgon CorporationInventors: Ann M. Sherbondy, Daniel P. Vanderpool
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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: 5527863Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.Type: GrantFiled: January 27, 1995Date of Patent: June 18, 1996Assignee: Bayer AGInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5525257Abstract: An improved composition for water treatment and for alkaline cleaning contains polyaspartic acid or a derivative thereof and a polycarboxylic acid.Type: GrantFiled: October 7, 1994Date of Patent: June 11, 1996Assignee: Bayer AGInventors: Roland Kleinstuck, Hermann Sicius, Torsten Groth, Winfreid Joentgen
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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: 5506335Abstract: Sulfonic acid group-containing polyaspartic acid derivatives, some of which are novel, having repeating units of the structures I and II ##STR1## in whichR.sup.1 has the meaning given in the description, are suitable for water treatment and as a detergent additive.Type: GrantFiled: November 9, 1994Date of Patent: April 9, 1996Assignee: Bayer AGInventors: Hermann Uhr, Lutz Heuer, Torsten Groth, Winfried Joentgen, Roland Kleinstuck
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Patent number: 5496914Abstract: Polymers of maleic, fumaric or malic acids or maleic, fumaric or malic acid and ammonia with amino acids are prepared by heating at 180.degree.-350.degree. C., preferably 200.degree.-300.degree. C. The polymer formed may be converted to a salt by hydrolysis with a metal hydroxide or ammonium hydroxide.Type: GrantFiled: January 18, 1995Date of Patent: March 5, 1996Assignee: SRCHEM, Inc.Inventors: Louis L. Wood, Gary J. Calton
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Patent number: 5490942Abstract: A process of inhibiting oxalate scale formation in aqueous systems is disclosed. A preferred class of scale inhibitors is represented by polyamino hexamethylene phosphonates. These phosphonate inhibitors can be used in levels of from 0.05 ppm to 300 ppm (of the aqueous solution) at pH in the near neutral to preferably alkaline medium.Type: GrantFiled: June 10, 1994Date of Patent: February 13, 1996Assignee: Monsanto CompanyInventor: Krzysztof Kuczynski
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Patent number: 5486294Abstract: Disclosed is a method of inhibiting the formation of scales such as barium and strontium sulfate in low pH aqueous system. The method involves treating the aqueous system with a scale control treatment including polyepoxysuccinic acid. Typical low pH aqueous systems where the present invention is particularly useful are oilfield produced water, resin bed water softeners during acid regeneration operations.Type: GrantFiled: September 30, 1994Date of Patent: January 23, 1996Assignee: Betz Laboratories, Inc.Inventor: J. Michael Brown
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Patent number: 5478476Abstract: Certain N-bis(phosphonomethyl) amino acids are novel compounds and are useful in preventing calcium carbonate scale.Type: GrantFiled: December 14, 1994Date of Patent: December 26, 1995Assignee: Nalco Chemical CompanyInventor: Vera Dragisich
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Patent number: 5470942Abstract: There is disclosed a process for preparing polyaspartic acid by thermal condensation of L-aspartic acid in a novel catalyst which shortens the reaction time and increases the molecular weight of the polymer. The novel catalyst is a catalytically effective methylenephosphonic acid. Typical catalysts are 1-hydroxyethylidene-1,1-diphosphonic acid and aminotris(methylenephosphonic acid). The methylenephosphonic acid is blended with the amino acid in a molar ratio of amino acid to catalyst in the range of from about 1:1 to 40:1.Type: GrantFiled: February 16, 1995Date of Patent: November 28, 1995Assignee: Monsanto CompanyInventors: Gregory C. Alexander, Mark E. Jason, Dennis J. Kalota
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Patent number: 5462668Abstract: Additives are usually diluted before they are added to a geothermal brine processing stream. It has been found that one preferred diluent is the conditioned steam condensate produced after power generation in the geothermal plants. One class of additives beneficially diluted by the conditioned steam condensate are crystal structure modifiers. When it is diluted with the steam condensate, the heat-sensitive crystal structure modifier is prevented from being degraded by the heat of the brine so that when blended with the geothermal brine the crystal structure modifier can perform its function of inhibiting the precipitation of alkaline earth salts.Type: GrantFiled: September 30, 1993Date of Patent: October 31, 1995Assignee: Union Oil Company of CaliforniaInventors: Darrell L. Gallup, John L. Featherstone, Carl E. Flint
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Patent number: 5454954Abstract: A composition useful as a deposit control agent to control the formation, deposition and adherence of scale in the process of extracting precious metals from an ore comprising (I) an aqueous slurry of a mining circuit having the ore, and (II) from about 5 to 500 ppm, based on the total weight of (I), of (a) from about 50 to 100 weight percent, based on the weight of (II), of a polyether polyamino methylene phosphonate, and (b) from about 0.1 to 50 weight percent, based on the weight of (II), of a polymer. A method for inhibiting calcium scale in one or more aqueous systems of a mining circuit employing this composition is also provided.Type: GrantFiled: November 2, 1994Date of Patent: October 3, 1995Assignee: Calgon CorporationInventors: Nicholas J. Alfano, David M. Shenberger
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Patent number: 5413718Abstract: Geothermal brines are extracted from the earth, flashed and the remaining liquids are injected back into the earth. Although it would be advantageous for resource maintenance to inject the same amount of liquid as extracted, addition of liquid causes massive system upsets that prevent such addition. River or other similar surface waters can now be added to the brine stream created when extracting power from a geothermal source, after adding a crystal structure modifier to the brine stream. In operations where the brine stream is returned to the earth, the weight rate of the brine injected into the earth is brought to at least 90% what it was when extracted from the ground.Type: GrantFiled: September 30, 1993Date of Patent: May 9, 1995Assignee: Union Oil Company of CaliforniaInventors: Darrell L. Gallup, John L. Featherstone
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Patent number: 5409614Abstract: NORMs are inhibited or prevented from precipitating with scale produced by a hot aqueous solution by adding multiple portions of a crystal structure modifier to the aqueous solution as it cools before and during removal of silicon containing components by precipitation. Preferred crystal structure modifiers include polyacrylate crystal structure modifiers and phosphonomethylated amines.Type: GrantFiled: July 16, 1993Date of Patent: April 25, 1995Assignee: Union Oil Company of CaliforniaInventors: Darrell L. Gallup, John L. Featherstone
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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: 5401419Abstract: The present invention relates to operation of residential or commercial evaporative coolers, more specifically, its subject matter is conservation of water needed to cool down ambient air in their operation.Type: GrantFiled: August 23, 1993Date of Patent: March 28, 1995Inventor: Sidney Z. Kocib
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Patent number: 5391303Abstract: Polyether polyamino methylene phosphonate N-oxides 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: October 7, 1993Date of Patent: February 21, 1995Assignee: Calgon CorporationInventor: Raymond J. Schaper
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Patent number: 5378368Abstract: Polyether polyamino methylene phosphonates, when added to various industrial water systems in concentrations between 0.1 mg/L and 50 mg/L, control silica/silicate deposition. In particular, this stabilization can be achieved under severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate.Type: GrantFiled: August 5, 1992Date of Patent: January 3, 1995Assignee: Calgon CorporationInventor: Jasbir S. Gill
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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: 5368830Abstract: Calcium carbonate scale deposits, occurring in gold and silver mining involving the cyanidation process which utilizes heap and vat leaching, and carbon-in-pulp, carbon-in-leach, particularly activated carbon separation columns; said scale deposits forming on the carbon surfaces and in the emitters and sprinklers of the heap leaching system, are controlled using polyether polyamino methylene phosphonates, which provide effective inhibition despite the severe conditions encountered in these systems, including very high pH's.Type: GrantFiled: October 15, 1992Date of Patent: November 29, 1994Assignee: Calgon CorporationInventors: Nicholas J. Alfano, Bennett P. Boffardi
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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: 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