Utilizing Organic Agent Patents (Class 210/698)
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Patent number: 5332505Abstract: A method and composition for inhibiting silica and silicate deposition on metal surfaces in contact with aqueous systems is disclosed.Type: GrantFiled: October 2, 1992Date of Patent: July 26, 1994Assignee: Betz Laboratories, Inc.Inventors: William S. Carey, Andrew Solov, Libardo A. Perez
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Patent number: 5330564Abstract: Aqueous and storage-stable compositions for the deposition of temporary barrier layers on spray-coating booths and the like contain5 to 80% by weight of one or more C.sub.8 -carboxylic acid and/or an alkali metal salt thereof,1 to 40% by weight of a pH-regulator consisting of one or more alkanol amine and/or alkali metal hydroxide, and1 to 15% by weight of one or more layered silicate and/or polyacrylate and/or carboxymethylcellulose,together with water and any further desired additives, and have a pH value of 6 to 10 and a viscosity of 30 to 50 DIN-sec.The invention also provides a process for the production of such compositions.Type: GrantFiled: May 26, 1992Date of Patent: July 19, 1994Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Juergen Geke, Bernhard Zange, Hans Rehm, Hans Fehr, Thomas Molz, Kurt Buick, Emil Bruegel, Lutz Huesemann
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Patent number: 5326478Abstract: A method of controlling the formation and deposition of scale forming salts in a circulating aqueous system is described wherein a treatment solution of a substoichiometric amount of polyepoxysuccinic acid in combination with agaric acid is employed.Type: GrantFiled: July 29, 1993Date of Patent: July 5, 1994Assignee: Betz Laboratories, Inc.Inventors: Libardo A. Perez, Donald T. Freese, Judith B. Rockett, William S. Carey
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Patent number: 5322635Abstract: A soap composition for the removal and prevention of scale in aqueous media comprising a 1:1 stoichiometric equivalent of an organic carboxylic acid and an amine base. The organic carboxylic acid is selected from the group consisting of hydroxyacetic, citric, acetic, gluconic, salicylic, tartaric and benzoic, and mixtures thereof. The amine base is selected from the group consisting of monoisopropanolamine, diisopropanolamine, triisopropanolamine, monoethanolamine, diethanolamine, triethanolamine, diethylamine and mixtures thereof.Type: GrantFiled: May 16, 1991Date of Patent: June 21, 1994Assignee: h.e.r.c. IncorporatedInventors: Allen C. Hieatt, Jerome H. Ludwig
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Patent number: 5320757Abstract: Hydrolyzed copolymers (A) maleic anhydride with (B) at least one more ethylenically unsaturated monomer other than acrylic acid or methacrylic acid or with a mixture of (B) and (C) acrylic acid or methacrylic acid are employed in a process to inhibit calcium oxalate formation and deposition.Type: GrantFiled: April 5, 1993Date of Patent: June 14, 1994Assignee: Betz Laboratories, Inc.Inventors: Davor F. Zidovec, Alexander D. Fisher
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Patent number: 5314626Abstract: Siliceous materials produced by thermally treating Bayer process liquors are obtained in modified form when produced in the presence of ammonium, aromatic amine, and amine compounds, or compounds bearing ammonium, aromatic amine or amine moieties, such as N-propylamine, pyridine and tetramethylammonium hydroxide. These modified siliceous materials possess morphologies which confer upon them a reduced tendency to deposit on surfaces throughout the process.Type: GrantFiled: August 3, 1992Date of Patent: May 24, 1994Assignee: Nalco Chemical CompanyInventor: Peter A. Dimas
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Patent number: 5306429Abstract: Copolymers of polyamino acids formed by reaction of polysuccinimide with alkyl, alkenyl, aromatic amines or alkyl and alkenyl polyamines are useful as inhibitors of mineral scale deposition. Such compounds may be used in high volume water applications such as boiler, cooling, oil well, agricultural sprays and irrigation water. They are also useful in preventing scale formation on fabrics when formulated with laundry detergents and in preventing scale formation on glassware when formulated in dishwashing detergents.Type: GrantFiled: October 29, 1992Date of Patent: April 26, 1994Assignee: Srchem, IncorporatedInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5302291Abstract: A method for improving the dispersibility of over-sprayed, solvent-based paints in aqueous systems which comprises adding an effective amount of a chelating agent to an aqueous system containing solvent-based paints, particularly in high-hardness waters.Type: GrantFiled: September 30, 1992Date of Patent: April 12, 1994Assignee: Calgon CorporationInventor: Joseph P. Miknevich
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Patent number: 5302293Abstract: The present invention provides a process for stabilizing iron oxides and iron hydroxides in produced oil field waters. A water soluble polymer containing pendant N-substituted amide functionality units is added at a rate of about 6 parts by weight polymer to 10 parts by weight iron in the produced water.Type: GrantFiled: July 13, 1992Date of Patent: April 12, 1994Assignee: Nalco Chemical CompanyInventors: Roy I. Kaplan, John D. Johnson
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Patent number: 5302292Abstract: The disclosure teaches a water treatment composition and method especially useful with respect to groundwater treatment upstream of an air stripper facility. The composition includes a chelating agent such as citric acid and/or ethylenediaminetetraacetic acid and a sequestration agent such as diethylenetriamine-methylenephosphoric acid.Type: GrantFiled: April 27, 1992Date of Patent: April 12, 1994Assignee: Jamestown Chemical Company, Inc.Inventors: Kenneth Soeder, Mitchel Helfeld
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Patent number: 5294352Abstract: A composition for the detackification and clarification of acid and alkaline paint and lacquer waste waters and paint spray booth wastes, comprising:an inorganic-organic and/or organic adduct alloy polymer composition having the formula:A.multidot.B.sup.+ .multidot.D.sup.+wherein:A=[(SiO.sub.2 /Me.sup.I.sub.2 O).sub.u Me.sup.II.sub.m Me.sub.m.sup.III(OH) p.sup.(SO 4.sup.) y.sup.(Aci) (2m+3n)-p-2y].sub.4wherer=1 to 98% bw;u=0 to 10% bw; ##STR1## where: x=0 to 98% bw; Z is a divalent substituted or unsubstituted aliphatic, cycloaliphatic, heterocyclic or aromatic radicalD.sup.+ (PQAM).sub.wwherew=2 to 98% b.w. of polyquaternized polymer (PQAM)Me.sub.m.sup.II is selected from the divalent cationic group comprising: Mg, Zn, Ca, and Fe.sup.2+m=0 to 5Me.sub.n.sup.III is a tri-or more valent metal selected from the group comprising: Fe, Al, and Al-Zn complexes;n=1 to 20Aci is selected from the monovalent anionic group comprising Cl.sup.-, Br.sup.-, I.sup.-, NO.sub.3 --, H.sub.2 PO.sub.4 --, CH.sub.3 COO.sup.-, OH.Type: GrantFiled: April 15, 1993Date of Patent: March 15, 1994Inventor: John J. Waldmann
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Patent number: 5288409Abstract: Growth of zebra mussels on a surface is inhibited by making the surface from an unsaturated polyester having copolymerized therein about 1-40% N-phenyl maleimide.Type: GrantFiled: April 2, 1993Date of Patent: February 22, 1994Assignee: Aristech Chemical CorporationInventors: Richard P. Herrle, Virginia Piermattie
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Patent number: 5286810Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.Type: GrantFiled: April 7, 1993Date of Patent: February 15, 1994Assignee: SRCHEM IncorporatedInventor: Louis L. Wood
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Patent number: 5282976Abstract: A novel terpolymer particularly useful as a scale inhibitor for aqueous systems is provided. The terpolymer preferably is derived from monomers of acrylic or methacrylic acid, vinyl acetate and/or vinyl alcohol, and sodium-1-allyloxy-2-hydroxypropyl sulfonate.Type: GrantFiled: July 21, 1992Date of Patent: February 1, 1994Assignee: Rhone-Poulenc Inc.Inventor: Dominic W.-K. Yeung
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Patent number: 5283006Abstract: A method for neutralizing acidic species and inhibiting the deposition of amine acid salts on the internal surfaces of elevated temperature processing units in a petroleum refinery comprising adding to the hydrocarbon liquid being processed therein a tertiary amine, including trimethylamine and triethylamine.Type: GrantFiled: November 30, 1992Date of Patent: February 1, 1994Assignee: Betz Laboratories, Inc.Inventors: Scott E. Lehrer, James G. Edmondson
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Patent number: 5277823Abstract: A method for inhibiting silica scale formation in aqueous systems using selected low molecular weight (meth)acrylic or maleic acid based copolymers or terpolymers, magnesium ion alone, or the selected copolymers and terpolymers with aluminum ion or magnesium ion, or polyacrylic or polymaleic acid with aluminum ion or magnesium ion.Type: GrantFiled: January 19, 1993Date of Patent: January 11, 1994Assignee: Rohm and Haas CompanyInventors: William M. Hann, Judy H. Bardsley, Susan T. Robertson, Jan E. Shulman
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Patent number: 5271847Abstract: A method for controlling the deposition of silica on the structural surfaces of steam generating systems comprising the use of a water soluble polymer having the structure ##STR1## wherein E is the repeat unit remaining after polymerization of an alpha, beta ethylenically unsaturated compound.This polymer may also be used in concert with topping agents such as phosphoric acids, phosphonic acids, polyvalent metal salts, metal chelating agents and oxygen scavengers.Type: GrantFiled: October 6, 1992Date of Patent: December 21, 1993Assignee: Betz Laboratories, Inc.Inventors: Fu Chen, Scott M. Boyette, Keith A. Bair
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Patent number: 5268092Abstract: An automatic control system for maintaining the quality of water in a cooling tower utilizes a probe which senses the oxygen reduction potential (ORP) of the water for activating a chemical supply means, in accordance with a pre-established ORP measurement, to maintain the ORP of the cooling tower water between lower and upper limits. A second sensing probe measures the conductivity (in MHos) of the water as a factor of the total dissolved solids (TDS) to control the bleed-off or blow-down of the water. The chemicals, which are supplied for maintaining the ORP, permit significantly higher total dissolved solids in the water than with standard cooling tower systems, without the buildup of scale. As a consequence, water consumption is significantly reduced; and the system functions automatically, without requiring periodic visual inspection, water analysis or manual operation.Type: GrantFiled: May 17, 1993Date of Patent: December 7, 1993Assignee: H.E.R.C., Inc.Inventor: Todd R. Eden
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Patent number: 5268108Abstract: Radioactivity and fluoride ion are inhibited or prevented from precipitating in scale formed from a geothermal brine by adding a dispersant to the cooling brine solution. Preferred dispersants include polyacrylates and polyphosphonic acids.Type: GrantFiled: June 19, 1991Date of Patent: December 7, 1993Assignee: Union Oil Company of CaliforniaInventors: Darrell L. Gallup, John L. Featherstone
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Patent number: 5264148Abstract: The present invention provides a moisture-scavenging composition including the compound: ##STR1## wherein: R.sub.1 is a methyl group, or a branched or straight chain alkyl or alkanol group; R.sub.2, R.sub.3, R.sub.4 and R.sub.6 are, individually, a hydrogen atom, a methyl group, a straight chain or branched chain alkyl or alkanol group, a cyclic alkyl or an aryl group; R.sub.5 is a methyl or methylol group, or a branched chain or straight chain alkyl or alkanol group; R.sub.7 is a hydrogen atom, a methyl group, a straight chain or branched chain alkyl or alkanol group, a cyclic alkyl group, a carbonyl group or an aryl group, or R.sub.7 and R.sub.6 are fused together with the attached carbon to form an eight member bicyclic compound having the structure: ##STR2## wherein: R.sub.1 ' is a methyl group or a branched or straight chain alkyl or alkanol group; R.sub.2 ', R.sub.3 ', and R.sub.Type: GrantFiled: December 4, 1990Date of Patent: November 23, 1993Assignee: Angus Cheical CompanyInventors: Chih-Yueh Chou, Arthur T. Jones, Thomas L. Johnson
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Patent number: 5263541Abstract: A method for inhibiting inorganic sulfate scale growth in an aqueous fluid present within or produced from a subterranean formation is performed by contacting the aqueous fluid in situ with a scale inhibitor composition containing two homopolymers in solution within an aqueous liquid medium. The first homopolymer is a polyvinyl sulfonate and the second homopolymer is a polyacrylic acid. The weight ratio of the first homopolymer to second homopolymer is preferably at least about 1:1 and the aqueous fluid being contacted by the composition typically contains a relatively high concentration of precursor ions of inorganic sulfate scale, including scale-forming inorganic cations and scale-forming sulfate anions.Type: GrantFiled: August 20, 1992Date of Patent: November 23, 1993Inventors: Richard T. Barthorpe, Frank L. Dormish
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Patent number: 5259701Abstract: Certain furan compounds are disclosed as being useful as marine or fresh water antifoulant compounds to be used in protective carrier compositions such as film forming polymer to protect fish nets, boats, pilings, and piers.Type: GrantFiled: October 22, 1992Date of Patent: November 9, 1993Assignee: Rohm and Haas CompanyInventors: Donald L. Gerhart, Daniel Rittschof, Irving R. Hooper, Anthony Clare
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Patent number: 5256332Abstract: A low phosphorus process for controlling corrosion in aqueous systems by adding to the aqueous system an effective amount of a composition comprising orthophosphate, azole, polyepoxysuccinic acid and the copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether.Type: GrantFiled: November 19, 1992Date of Patent: October 26, 1993Assignee: Betz Laboratories, Inc.Inventor: Stephen M. Kessler
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Patent number: 5248221Abstract: Certain gamma lactones are disclosed as being useful as marine or fresh water antifoulant compounds to be used in protective carrier compositions such as film forming polymer to protect fish nets, boats, pilings, and piers.Type: GrantFiled: October 22, 1992Date of Patent: September 28, 1993Assignee: Rohm and Haas CompanyInventors: Donald J. Gerhart, Daniel Rittschof, Irving R. Hooper
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Patent number: 5248438Abstract: The treatment of an aqueous system to inhibit scale formation with a polyepoxysuccinic acid scale inhibitor, an acrylic acid copolymer and a lanthanide ion blending agent.Type: GrantFiled: January 28, 1992Date of Patent: September 28, 1993Assignee: Betz Laboratories, Inc.Inventor: Libardo A. Perez
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Alkoxybenzotriazole compositions and the use thereof as copper and copper alloy corrosion inhibitors
Patent number: 5236626Abstract: An alkoxybenzotriazole, in combination with mercaptobenzothiazole, tolyltriazole, benzotriazole, a substituted benzotriazole and/or 1-phenyl-5-mercaptotetrazole, is used to inhibit the corrosion of metallic surfaces, particularly copper surfaces, in contact with an aqueous system. Systems and compositions are also claimed.Type: GrantFiled: December 14, 1992Date of Patent: August 17, 1993Assignee: Calgon CorporationInventors: Daniel P. Vanderpool, Charles Y. Cha -
Patent number: 5234602Abstract: Barium sulfate scale is dissolved by contacting the scale with an aqueous solvent having a pH of about 10 to about 14, preferably about 12, and comprising a chelating agent comprising a polyaminopolycarboxylic acid or salt of such an acid, and a synergist anion. The solvent containing the dissolved scale is regenerated by acidifying the solvent in the presence of an anion which forms a precipitate of an insoluble salt of the alkaline earth metal of the dissolved scale. The precipitate is then removed from the solvent. Thereafter, the pH of the solvent is increased to a pH of about 10 to about 14, preferably about 12, to recover a regenerated solvent for reuse, in dissolving scale.Type: GrantFiled: October 5, 1990Date of Patent: August 10, 1993Assignee: Mobil Oil CorporationInventors: Richard L. Morris, James M. Paul
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Patent number: 5232603Abstract: Water-soluble copolymers which contain, polymerized in, as characteristic monomers(a) 99 to 50% by weight of monoethylenically unsaturated carboxylic acids with 3 to 8 carbon atoms or their salts and(b) 1 to 50% by weight of N-vinylimidazole or substituted N-vinylimidazoles, their salts or products of quaternization and which have K values of from 10 to 50 are used for water treatment to reduce deposits of scale and sludge in water-conveying systems.Type: GrantFiled: November 1, 1991Date of Patent: August 3, 1993Assignee: BASF AktiengesellschaftInventors: Walter Denzinger, Heinrich Hartmann, Charalampos Gousetis, Ulrich Goeckel, Alfred Ruland
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Patent number: 5223146Abstract: A method for treating an aqueous system which contains solid particles of iron (III) oxide is disclosed which comprises adding to the system catechol, hydroquinone, their water soluble salts, and mixtures thereof in an amount effective to disperse or suspend iron (III) oxide particles. The aqueous system should have a pH greater than 7 and have low to moderate hardness.Type: GrantFiled: October 9, 1991Date of Patent: June 29, 1993Assignee: W. R. Grace & Co.-Conn.Inventor: Robert P. Kreh
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Alkoxybenzotriazole compositions and the use thereof as copper and copper alloy corrosion inhibitors
Patent number: 5217686Abstract: An alkoxybenzotriazole, in combination with mercaptobenzothiazole, tolyltriazole, benzotriazole, a substituted benzotriazole and/or 1-phenyl-5-mercaptotetrazole, is used to inhibit the corrosion of metallic surfaces, particularly copper surfaces, in contact with an aqueous system. Systems and compositions are also claimed.Type: GrantFiled: September 24, 1990Date of Patent: June 8, 1993Assignee: Calgon CorporationInventors: Daniel P. Vanderpool, Charles Y. Cha -
Patent number: 5200117Abstract: Alkaline earth metal scales, especially barium sulfate scale deposits are removed from oilfield pipe and other tubular goods with a scale-removing composition comprising an aqueous alkaline solution having a pH of about 8 to about 14, preferably about 11 to 13, of a polyaminopolycarboxylic acid, preferably EDTA or DTPA and a catalyst or synergist comprising a monocarboxylic acid, preferably a substituted acetic acid such as mercaptoacetic, hydroxyacetic acid or aminoacetic acid or an aromatic acid such as salicylic acid. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster rate than is possible without the synergist.Type: GrantFiled: January 16, 1992Date of Patent: April 6, 1993Assignee: Mobil Oil CorporationInventors: Richard L. Morris, James M. Paul
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Patent number: 5190656Abstract: A liquid membrane method for removing scale deposits wherein a novel chelating composition is utilized. The composition used in the external and internal aqueous phases of said membrane comprises an aqueous solution having a pH of about 8 to about 14, and an aminocarboxylic acid or polyamine chelant. Additionally, a catalyst or synergist is used in the external phase only. Preferred chelants comprise diethylenetriamine pentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA) or alkali salts thereof. Anions of organic and inorganic acids comprise the catalyst used in the external phase. Catalysts which can be used include fluoride, oxalate, persulfate, dithionate, hypochlorite, formate, thio, amino and hydroxy acetate anions. When the solution containing the composition is contacted with a surface containing a scale deposit, the deposit dissolves substantially more scale quicker than heretofore possible.Type: GrantFiled: August 7, 1991Date of Patent: March 2, 1993Assignee: Mobil Oil CorporationInventors: James M. Paul, Richard L. Morris
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Patent number: 5190664Abstract: A method for controlling fouling of a heat exchange surface exposed to a high-enthalpy geothermal brine tending to form silica scale, but containing less than a saturated amount of cations capable of reacting with sulfates. The method adds a limited amount of sulfuric acid to the brine to form a mixture. The amount of sulfuric acid is limited to that required to produce sulfates sufficient to apparently complex with silica, but less than the amount required to increased the sulfates to above saturation amounts of sulfate reacting cations, significantly reducing or virtually eliminating sulfate and silica deposits and fouling. The addition is further controlled to an amount which reduces the pH of the mixture to no less than about 4.5. The addition does not significantly increase corrosion rates of mild steel heat exchanger materials of construction.Type: GrantFiled: October 31, 1990Date of Patent: March 2, 1993Assignee: Union Oil Company of CaliforniaInventors: Darrell L. Gallup, Michael L. Barnes, Douglas Cope, Quirino S. Kolimlim, John K. Leong
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Patent number: 5188755Abstract: A surface erodible controlled releasing, free standing cleaning block for domestic water closets comprises controlled releasing agent, erosion rate modifier, processing aid, acidic chelating agent, color indicator, density modifier and internal lubricant.Type: GrantFiled: October 10, 1991Date of Patent: February 23, 1993Assignee: Block Drug CompanyInventor: Tiang-Shing Chang
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Patent number: 5183573Abstract: A process for preventing or removing calcium and rust scale deposits from surfaces which are in contact with aqueous systems comprising adding to the aqueous system 3,5-bis(di-N,N-(carboxymethyl)aminomethyl)-4-hydroxybenzenesulfonic acid in an amount effective to remove the scale and rust deposits.Type: GrantFiled: July 22, 1991Date of Patent: February 2, 1993Assignee: W. R. Grace & Co.-Conn.Inventors: Robert P. Kreh, Wayne L. Henry
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Patent number: 5180498Abstract: A method for controlling the deposition of scale imparting species on the structural surfaces of steam generating systems comprising the use of a water soluble polymer having the structure ##STR1## wherein E is the repeat unit remaining after polymerization of an alpha, beta ethylenically unsaturated compound.This polymer may also be used in concert with topping agents such as phosphoric acids, phosphonic acids, polyvalent metal salts, metal chelating agents and oxygen scavengers.Type: GrantFiled: January 28, 1992Date of Patent: January 19, 1993Assignee: Betz Laboratories, Inc.Inventors: Fu Chen, Scott M. Boyette, Keith A. Bair
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Patent number: 5171450Abstract: Method of determining treating agent concentration added to a water recirculating system to enhance efficiency by inhibiting scaling or corrosion or settling of particulates; the treating agent bears an amine-containing fluorescent moiety tag covalently bonded thereto, allowing sample analysis for emissivity as a measure of concentration equatable to the performance of treating agent in the system; by simultaneously employing an inert fluorescent tracer equated to the original (ppm) dosage of treating agent, consumption of the treating agent may be determined by emissivity differences equated to the original dosage.Type: GrantFiled: March 20, 1991Date of Patent: December 15, 1992Assignee: Nalco Chemical CompanyInventor: John E. Hoots
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Patent number: 5158684Abstract: This invention relates to a method of transporting and inhibiting the deposition of copper and copper-iron materials on heat transfer devices in steam generating systems. This method utilizes a thermally stable chelant and a carboxylated polymeric dispersant as the treatment agents. Representative chemicals are 1,10-phenanthroline and 9:1 methacrylic acid/acrylic acid copolymer.Type: GrantFiled: March 12, 1991Date of Patent: October 27, 1992Assignee: Betz Laboratories, Inc.Inventors: Roger D. Moulton, Alexander C. McDonald, James L. Soos
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Patent number: 5156744Abstract: Polymaleic anhydride having a weight average molecular weight by gel permeation chromatography of between 450 and 800 and a polydispersivity of between 1.0 and 1.15 is produced by polymerizing maleic anhydride, using a peroxide initiator in an amount not greater than 10% by weight of the anhydride, in a dilute solution in o-xylene or a substituted o-xylene.Type: GrantFiled: September 26, 1991Date of Patent: October 20, 1992Assignee: FMC CorporationInventors: Jan Rideout, Duncan J. MacQuarrie
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Patent number: 5152902Abstract: .beta.-Polyaspartic acid having a weight average molecular weight of 1000 to 5000 produced by hydrolysis of anhydropolyaspartic acid, exhibits a high degree of calcium carbonate and calcium phosphate inhibition.Type: GrantFiled: March 19, 1991Date of Patent: October 6, 1992Assignee: Donlar CorporationInventors: Larry P. Koskan, Kim C. Low, Abdul R. Y. Meah, Anne M. Atencio
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Patent number: 5147555Abstract: A method of treating water to inhibit the formation of scale is disclosed. The method is particularly effective at inhibiting the formation and deposition of calcium and barium scales in aqueous systems such as cooling water systems. The method comprises introducing into the aqueous system a polyepoxysuccinic acid of the general formula ##STR1## when n ranges from about 2 to about 11, M is hydrogen or a water soluble cation such as Na.sup.+, NH.sub.4.sup.+, or K.sup.+ and R is hydrogen, C.sub.1-4 alkyl or C.sub.1-4 substituted alkyl.Type: GrantFiled: July 30, 1991Date of Patent: September 15, 1992Assignee: Betz Laboratories, Inc.Inventors: J. Michael Brown, John F. McDowell, Kin-Tai Chang
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Patent number: 5141716Abstract: The present invention utilizes low volatility amines or alkanol amines to control caustic corrosion which can take place when a boiler system, treated with a coordinated phosphate/pH program, is "out of control".N-substituted hydroxyalkyl piperazines are also capable of mitigating caustic corrosion in coordinated phosphate/pH programs. Combinations of the compounds of the present invention and phosphate have also been shown to be efficacious at mitigating caustic corrosion in coordinated phosphate/pH programs.Type: GrantFiled: January 18, 1991Date of Patent: August 25, 1992Assignee: Betz Laboratories, Inc.Inventors: John A. Muccitelli, Nancy Feldman
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Patent number: 5139702Abstract: A composition useful for treating aqueous systems comprising a naphthylamine polycarboxylic acid having the formula: ##STR1## wherein X is CO.sub.2 H or SO.sub.3 H, Y is H, C.sub.1 to C.sub.6 alkyl, CO.sub.2 H or SO.sub.3 H, R is H, C.sub.1 to C.sub.6 alkyl, CO.sub.2 R' or COR', R' is C.sub.1 to C.sub.6 alkyl, n is an integer from 1 to 20, and water soluble salts thereof.Type: GrantFiled: October 24, 1991Date of Patent: August 18, 1992Assignee: W. R. Grace & Co.-Conn.Inventors: Charles G. Carter, Robert P. Kreh, Lai-Duien G. Fan
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Patent number: 5135661Abstract: The present invention provides a process for treating water or an aqueous system to prevent the deposition of scale caused by scale-forming impurities in the water which comprises hydrolyzed polymaleic anhydride and a hydrolyzed copolymer of maleic anhydride with at least one mono-ethylenically unsaturated monomer.Type: GrantFiled: June 27, 1991Date of Patent: August 4, 1992Inventor: Suresh Patel
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Patent number: 5130052Abstract: A method of inhibiting corrosion of a metal surface in an aqueous system having a pH of at least 6, comprising maintaining in the aqueous system, in an amount effective to inhibit corrosion, a water-soluble, organic-rare earth metal chelate which is derived from a rare earth metal having an atomic number from 57 to 71 and an organic chelant. The organic chelant provides not only water solubility but surprisingly enhanced corrosion inhibiting activity. The water-soluble, organic-rare earth chelates may be advantageously combined with other corrosion inhibitors such as zinc chelates, organophosphonates, phosphates, chromates, molybdates, and the like.Type: GrantFiled: October 24, 1991Date of Patent: July 14, 1992Assignee: W. R. Grace & Co.-Conn.Inventors: Robert P. Kreh, Vincent R. Kuhn, John Richardson, Robert M. Spotnitz, Charles G. Carter, Vladimir Jovancicevic
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Patent number: 5128100Abstract: A process for inhibiting the adhesion of bacterial cells to solid surfaces in aqueous systems and thus controlling biological fouling comprising adding a water-soluble ionene polymer to the aqueous systems in an amount ranging from about 0.5 ppm to about 50 ppm based on the weight of aqueous liquid in the system.Type: GrantFiled: August 14, 1991Date of Patent: July 7, 1992Assignee: Buckman Laboratories, Intl., Inc.Inventors: C. George Hollis, Percy A. Jaquess
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Patent number: 5116513Abstract: Polyaspartic acid as a calcium sulfate and barium sulfate inhibitor. Generally all forms of polyaspartic acid can be used. .beta.-polyaspartic acids are preferred.Type: GrantFiled: March 19, 1991Date of Patent: May 26, 1992Assignee: Donlar CorporationInventors: Larry P. Koskan, Kim C. Low
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Patent number: 5108514Abstract: This invention discloses an in-situ process or method for cleaning the interior surfaces of a swimming pool or the like for removing stains, scale, calcium deposits, and the like, and without the need for draining the pool. The chlorine content of the pool is initially tested, and chlorine is added to bring it up to a level sufficient to prevent algae growth for a period of up to 10 days without filtering. Water is added to the pool to insure all water line marks are sufficiently immersed so as to benefit from the cleaning operation. An acid wash solution, including a mixture of hydrochloric acid and a strong metal chelating agent, is then applied in-situ or as close to the surfaces to be cleaned as possible. As the stains, scale, and deposits dissolve, a strong organic acid such as oxalic acid is added to precipitate out the undesirable materials and cause them to settle down to the bottom of the pool for subsequent vacumming.Type: GrantFiled: February 8, 1991Date of Patent: April 28, 1992Inventor: Kim T. Kisner
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Patent number: 5102555Abstract: A process for stabilizing manganese ions in aqueous solutions is disclosed. The process comprises adding to an aqueous solution containing manganese ions a polymer or copolymer of unsaturated carboxylic compounds such as acrylic acid, methacrylic acid, polyacrylic acid and maleic anhydride and an orthophosphate. The ratio of polymer to orthophosphate is preferably about 2 to 1.Type: GrantFiled: February 26, 1991Date of Patent: April 7, 1992Assignee: Betz Laboratories, Inc.Inventor: Stephen M. Kessler
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Patent number: 5096601Abstract: A method for controlling zebra mussels in aqueous systems comprising treating aqueous systems which contain zebra mussels or which are prone to zebra mussel infestation with an effective amount of a composition comprising a) a water-soluble dialkyl diallyl quaternary ammonium polymer (polyquat); and b) didecyl dimethyl ammonium halide. A preferred polymer is a poly(quaternary ammonium) compound having the recurring structure [DMDAAX.sup.- ] resulting from the polymerization of monomeric dimethyl diallyl ammonium X.sup.-, wherein X.sup.- is any suitable anion.Type: GrantFiled: October 9, 1990Date of Patent: March 17, 1992Assignee: Calgon CorporationInventors: Ramon A. Muia, Rodney M. Donlan