Utilizing Organic Agent Patents (Class 210/698)
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Patent number: 6638431Abstract: A formulation and method to treat and control microbial growth present in the water of climate control systems such as air conditioner air handlers, dehumidifiers, and humidifiers, which formulation can be entrained and dispersed into to living space air. Specifically, a formulation is provided in the form of a tablet or a spray for being applied onto a wetted surface element present in these systems which will effectively control the growth of microbes such as fungus, molds, bacteria, and virus present on the surface for an extended period of time. The formulations include at least two metals, at least two chelating agents, at least one surfactant, and at least one viscosity enhancing compound.Type: GrantFiled: May 3, 2001Date of Patent: October 28, 2003Assignee: Mainstream Engineering CorporationInventors: Dwight D. Back, Robert P. Scaringe, John A. Meyer
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Publication number: 20030173302Abstract: Deposit formation is controlled in aqueous systems through the addition of at least one fatty amine surfactant.Type: ApplicationFiled: March 13, 2002Publication date: September 18, 2003Inventors: Kun Xiong, Mingli Wei
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Publication number: 20030173303Abstract: The present invention is directed a multifunctional polymer capable of inhibiting both calcium carbonate and calcium phosphate scale. The multifunctional polymer contains at least one monomer unit from each of four groups: dicarboxylic acids, mono-carboxylic acids, nonionic monomers, and sulfonated or sulfated monomers. The polymer also inhibits many other alkaline earth scales, such as calcium sulfate scale and provides stabilization of minerals such as iron, zinc and manganese. The polymer is especially effective in highly stressed systems that contain high electrolyte concentrations and have a high number of cycles of concentration.Type: ApplicationFiled: March 18, 2002Publication date: September 18, 2003Inventors: Anne-Marie B. Austin, Eric C. Ward
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Patent number: 6613899Abstract: Carboxyl-containing fructans such as carboxymethylinulin can be successfully used to prevent deposition of scale composed of, for example, calcium, barium and strontium salts of sulphuric acid and carbonic acid in oil extraction. In the oil extraction method, 0.5-200 ppm of a carboxyl-containing fructan that contains 0.3-3 carboxyl groups per mono-saccharide unit is incorporated in the process water, in the process equipment or in the oil-containing formation.Type: GrantFiled: December 11, 2000Date of Patent: September 2, 2003Assignee: Cooperatie Cosun U.A.Inventors: Hendrika Cornelia Kuzee, Hendricus Wilhelmus Carolina Raaijmakers
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Publication number: 20030160001Abstract: The present invention relates to a process for the control of encrustations of phosphate-containing double salts, characterized in that polymers having repeating succinyl units or their partial hydrolysates and/or their salts are allowed to act on encrustations of phosphate-containing double salts in stagnant or flowing waters which contain phosphate ions.Type: ApplicationFiled: February 19, 2003Publication date: August 28, 2003Inventors: Thomas Klein, Harry-Gunter Muller
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Patent number: 6587753Abstract: 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. This method is applicable for boilers being treated with any of several standard boiler treatment programs. By conducting the instant claimed method it is possible to automatically control a boiler using at least one fluorometer and one or more analytical devices and a controller.Type: GrantFiled: December 13, 2000Date of Patent: July 1, 2003Assignee: Ondeo Nalco CompanyInventor: Roger W. Fowee
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Publication number: 20030085175Abstract: This invention relates to metal oxides dispersant compositions comprising (a) certain a metal oxides dispersant, and (b) an oxime. The invention also relates to a process for dispersing metal oxides in an aqueous system that involves adding the dispersant composition to the aqueous system.Type: ApplicationFiled: February 21, 2001Publication date: May 8, 2003Inventors: Edward S. Beardwood, Kostan B. Charkhutian
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Publication number: 20030062315Abstract: The deleterious effects of metal ions in water, for example water hardness and formation of deposits, may be combated by application of an algin, for example alginic acid or a salt of alginic acid, such as sodium alginate or potassium alginate. Such a compound may bring about water purification and/or softening and prevent formation of deposits. Furthermore, such a compound may promote the removal of existing deposits, for example scale.Type: ApplicationFiled: March 21, 2002Publication date: April 3, 2003Applicant: Reckitt Benckiser (UK) LimitedInventors: Gay Joyce Cornelius, Ian Gordon Jolliffe, Malcolm Tom McKechnie, Edvar Jarle Onsoyen
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Publication number: 20030057158Abstract: A method for inhibiting the plugging of a conduit containing a flowable mixture comprising at least an amount of hydrocarbons capable of forming hydrates in the presence of water, and an amount of water, which method comprises adding to the mixture an amount of a dendrimeric compound effective to inhibit formation of hydrates at conduit temperatures and pressures, and flowing the mixture containing the dendrimeric compound and any hydrates through the conduit. Preferably, a hyperbranched polyester amide is used as hydrate formation inhibitor compound.Type: ApplicationFiled: October 4, 2002Publication date: March 27, 2003Inventor: Ulfert Cornelis Klomp
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Patent number: 6537457Abstract: Polyaspartic acid and, optionally a non-ionic surfactant, are used to treat circulating water from a paint shop.Type: GrantFiled: October 2, 2000Date of Patent: March 25, 2003Assignee: Aware Chemicals L.L.C.Inventors: Dirk Bohnes, Johannes Lindemann, Karl Manderscheid
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Publication number: 20030052059Abstract: A method for inhibiting the adverse effects on settling and compaction in aqueous systems such as biological waste treatments systems is disclosed. The method comprises adding to the aqueous system a treatment comprised of a combination of a biologically active surfactant and a divalent metal active species. The preferred biologically active surfactants are alkyl ethoxylates.Type: ApplicationFiled: June 19, 2001Publication date: March 20, 2003Inventors: Scott M. Boyette, Peter E. Norman, Kelly S. Smith
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Patent number: 6533958Abstract: A method of controlling microbial fouling is provided. The method controls microbial fouling using hypobromous acid, HOBr, formed by the reaction between an aqueous solution of alkali or alkaline earth metal hypochlorite and a bromide ion source. The method is characterized in that the alkali or alkaline earth metal hypochlorite or/and the bromide ion source is/are stabilized by the addition of a stabilizer before the hypobromous acid is formed by the reaction there between.Type: GrantFiled: September 13, 2001Date of Patent: March 18, 2003Assignee: Acculab Co., Ltd.Inventors: Sang Hea Shim, Chung Soo Kim
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Publication number: 20030038085Abstract: The present invention relates to methods for lowering the pH of leather processing solutions by adding a pH reduction agent that is urea sulfate, urea hydrochloride, triethanolamine hydrochloride, or triethanolamine sulfate as a replacement for conventional pH lowering acids, such as sulfuric acid, formic acid, acetic acid, etc. The invention may be used with respect to any leather processing step that requires pH adjustment, including deliming, pickling, tanning, dyeing, finishing, and retanning. The pH lowering method of the invention results in safer handling, more environmentally acceptable effluents, and decreased corrosion of process equipment.Type: ApplicationFiled: June 28, 2002Publication date: February 27, 2003Inventors: R. Richard Sargent, Jeffrey Randolph Alender, Thomas Hudson Moss
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Patent number: 6514458Abstract: Method for removing microbial biofilm from surfaces in contact with an aqueous system is disclosed, which comprises adding to the system a treatment comprising low foaming, ethoxylated anionic surfactant composed of alkyl substituted carboxylated acid or salt thereof and polyoxyethylene-polyoxypropylene block copolymer.Type: GrantFiled: February 25, 2000Date of Patent: February 4, 2003Assignee: GE Betz, Inc.Inventors: Melvin H. Czechowski, Wilson K. Whitekettle
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Publication number: 20030015475Abstract: The present invention relates to a method for preventing the deposition of contaminants in steam systems. In a method of this type, deposits are prevented in a simple and economic manner by metering an additive into the steam, which additive adheres to the steam-side surface of the steam system and has the effect of repelling moisture and contaminants.Type: ApplicationFiled: July 22, 2002Publication date: January 23, 2003Inventors: Erhard Liebig, Robert Svoboda
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Patent number: 6506258Abstract: The deposition of calcium salts, including calcium carbonate and calcium oxalate and the formation of foam, during the evaporation of sugar streams can be prevented or restricted by ding 0.1-200 ppm of a carboxyalkylfructan that contains 0.5-3 carboxyl groups per monosaccharide unit, 0.4-2.5 of which carboxyl groups are in the form of carboxyalkyl groups, to the sugar streams. The carboxyalkyl groups are, in particular, carboxymethyl groups. The other carboxyl groups can be carboxyl groups obtained by oxidation.Type: GrantFiled: December 5, 2000Date of Patent: January 14, 2003Assignee: Cooperatie Cosun U.A.Inventors: Robert Berends, Hendrika Cornelia Kuzee
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Publication number: 20020162800Abstract: A formulation and method to treat and control microbial growth present in the water of climate control systems such as air conditioner air handlers, dehumidifiers, and humidifiers, which formulation can be entrained and dispersed into to living space air. Specifically, a formulation is provided in the form of a tablet or a spray for being applied onto a wetted surface element present in these systems which will effectively control the growth of microbes such as fungus, molds, bacteria, and virus present on the surface for an extended period of time. The formulations include at least two metals, at least two chelating agents, at least one surfactant, and at least one viscosity enhancing compound.Type: ApplicationFiled: May 3, 2001Publication date: November 7, 2002Inventors: Dwight D. Back, Robert P. Scaringe, John A. Meyer
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Publication number: 20020144950Abstract: Compositions and methods for inhibiting scale are provided. Pursuant to the present invention, a composition for inhibiting scale is provided that includes a carbohydrate polymer having both nitrogen-containing groups and carboxyl groups. The nitrogen-containing groups include amino groups, amido groups and mixtures thereof. The present invention has been found useful for inhibiting scale in industrial waters, such as, pulp bleach plant process waters which contain calcium oxalate and barium sulfate scale.Type: ApplicationFiled: January 31, 2001Publication date: October 10, 2002Inventors: Sergey M. Shevchenko, Prasad Y. Duggirala
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Patent number: 6461518Abstract: This invention relates to a method for inhibiting the formation and deposition of silica scale in water systems. The method includes treating the water in such water systems with an effective amount of a polyamide that contains secondary amine and/or ether and amide functional groups.Type: GrantFiled: October 30, 2000Date of Patent: October 8, 2002Assignee: Nalco Chemical CompanyInventors: Konstantinos Demadis, Douglas G. Kelley, David P. Workman, Mingli Wei
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Patent number: 6436154Abstract: The formation of scale on equipment surface in contact with sodium alkali containing brines is inhibited by the addition of an alkylbenzene sulfonic acid or salt thereof to the brines.Type: GrantFiled: September 28, 2000Date of Patent: August 20, 2002Assignee: FMC Wyoming CorporationInventors: Aileen M. Halverson, Duane S. Halverson
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Patent number: 6369004Abstract: An additive for inhibiting the formation of gas hydrates in connection with hydrocarbon production and transportation comprising the water-soluble polymers comprising structural elements of the formula wherein each R is independently H or C1-C5-alkyl; X is H, an alkaline or earth alkaline metal or a quaternary ammonium group; R1 is H or C1-C18-alkyl; and R2 is C1-C18-alkyl; and wherein the alkyl groups represented by R1 and R2 optionally carry a hydroxy or amino substituent; and, optionally, a minor proportion of structural elements of the formula wherein R, R1, R2 and X may have the meaning as above, and Alk is a C1-C5-alkylene chain.Type: GrantFiled: November 24, 1997Date of Patent: April 9, 2002Assignees: Clariant GmbH, RF-Rogaland ResearchInventors: Peter Klug, Malcolm Kelland
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Patent number: 6365116Abstract: The present invention comprises a method for reducing the viscosity of the settled mud or underflow of a raked thickener thereby reducing the torque necessary to move the rake blade through the settled mud. The method includes the step of delivering a viscosity modifier to the settled mud and in front of the rake blade by pumping the viscosity modifier down the rake arm to an area in front of the rake blade. The method also includes an improved rake mechanism that includes a means for delivering viscosity modifier to the settled mud and in front of the rake blade. The present invention also includes a method for increasing the rate of consolidation of flocculated solids in a slurry.Type: GrantFiled: April 19, 2000Date of Patent: April 2, 2002Assignee: Nalco Chemical CompanyInventors: Scott Lewis Barham, Raymond Leslie Henderson
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Publication number: 20020030018Abstract: Methods and acidizing compositions for reducing the corrosion of the metal surfaces of tubular goods and the like and reducing the precipitation of metal sulfide from the acidizing compositions are provided. The methods basically comprise the steps of combining an aldol-amine adduct with an aqueous acid solution to preferentially react with sulfide ions subsequently dissolved by the aqueous acid solution and thereby prevent subsequently dissolved metal ions from reacting therewith and precipitating, and then introducing the aqueous acid solution containing the aldol-amine adduct into a well or other location to be acidized.Type: ApplicationFiled: September 18, 2001Publication date: March 14, 2002Inventor: Michael M. Brezinski
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Patent number: 6336058Abstract: 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 parameters of the boiler. The control matrices include (a) Polymer Based All-in-One Product; (b) Residual Phosphate Polymer Product with Scavenger and Condensate Corrosion Inhibitor Fed Separately; (c) pH/Phosphate Product with Polymer, Scavenger, and Condensate Corrosion Inhibitor Fed Separately; (d) All-Polymer Product with Separate Scavenger and Condensate Corrosion Inhibitor Fed Separately; and (e) pH/Phosphate Polymer Product with Scavenger and Condensate Corrosion Inhibitor Fed Separately.Type: GrantFiled: May 1, 2000Date of Patent: January 1, 2002Assignee: Nalco Chemical CompanyInventor: Roger W. Fowee
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Publication number: 20010053836Abstract: The present invention relates to novel low molecular weight, structured polymer compositions. The invention also relates to methods for inhibiting scale formation, precipitation or deposition; increasing dispersion of insoluble precipitates in process waters; treating cooling and boiler water; and reducing the viscosity of mineral slurries using the aforementioned polymer compositions.Type: ApplicationFiled: December 21, 2000Publication date: December 20, 2001Inventor: Janice E. LoSasso
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Patent number: 6325938Abstract: A method for cleaning separating membranes uses a uniquely formulated detergent. The detergent includes a percarbonate-containing, material, existing in the condition in which hydrogen peroxide is adducted in carbonate and is desirably an alkali metal salt. The percarbonate decomposes the organisms deposited on the membrane surfaces while being environmentally desirable. The detergent preferably also includes at least one bivalent iron salt, which improves the cleaning capability of the percarbonate via the so-called Fenton's reaction in which hydrogen peroxide adducted in the percarbonate reacts with the iron ions to form OH— radicals which have a very high oxidative reactivity. The detergent may also contain other oxidizers, a surfactant, a chelating agent, an acid and a pH regulator. The detergent is dissolved in water prior to use.Type: GrantFiled: July 7, 2000Date of Patent: December 4, 2001Assignees: Mitsubishi Rayon Co., Ltd., Mitsubishi Rayon Engineering Co., Ltd.Inventors: Satoshi Miyashita, Kenji Honjyo, Osami Kato, Kenji Watari, Takamitsu Takashima, Masanori Itakura, Hiroyuki Okazaki, Ikuo Kinoshita, Noriko Inoue
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Publication number: 20010045393Abstract: The present invention relates to methods for lowering the pH of leather processing solutions by adding a pH reduction agent that is urea sulfate, urea hydrochloride, triethanolamine hydrochloride, or triethanolamine sulfate as a replacement for conventional pH lowering acids, such as sulfuric acid, formic acid, acetic acid, etc. The invention may be used with respect to any leather processing step that requires pH adjustment, including deliming, pickling, tanning, dyeing, finishing, and retanning. The pH lowering method of the invention results in safer handling, more environmentally acceptable effluents, and decreased corrosion of process equipment.Type: ApplicationFiled: May 1, 1997Publication date: November 29, 2001Inventors: R. RICHARD SARGENT, JEFFREY RANDOLPH ALENDER, THOMAS HUDSON MOSS
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Patent number: 6322707Abstract: The present invention relates to novel low molecular weight, structured polymer compositions. The invention also relates to methods for inhibiting scale formation, precipitation or deposition; increasing dispersion of insoluble precipitates in process waters; treating cooling and boiler water; and reducing the viscosity of mineral slurries using the aforementioned polymer compositions.Type: GrantFiled: March 21, 2000Date of Patent: November 27, 2001Inventor: Janice E. LoSasso
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Patent number: 6241898Abstract: A treatment for inhibiting the microbial adhesion on surfaces in contact with an aqueous system is disclosed, which comprises adding to the system the combination of an alkylsulfosuccinate surfactant and a block copolymer.Type: GrantFiled: March 16, 1998Date of Patent: June 5, 2001Assignee: BetzDearborn Inc.Inventors: J. Barry Wright, M. Christine Johnson
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Patent number: 6237670Abstract: The metal content of a thermoplastic composition containing an undesirably high concentration of metal can be reduced by adding to 100 parts by weight of the composition at least about 0.3 parts by weight of a chelating agent and sufficient water to chelate metal in the composition to form chelated metal in the composition, and then removing at least some of the chelated metal from the composition.Type: GrantFiled: September 12, 2000Date of Patent: May 29, 2001Assignee: M. Argueso & Company, Inc.Inventor: Henry M. Muschio
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Patent number: 6231768Abstract: The present invention comprises a method for reducing the viscosity of the settled mud or underflow of a raked thickener thereby reducing the torque necessary to move the rake blade through the settled mud. The method includes the step of delivering a viscosity modifier to the settled mud and in front of the rake blade by pumping the viscosity modifier down the rake arm to an area in front of the rake blade. The method also includes an improved rake mechanism that includes a means for delivering viscosity modifier to the settled mud and in front of the rake blade. The present invention also includes a method for increasing the rate of consolidation of flocculated solids in a slurry.Type: GrantFiled: January 19, 1999Date of Patent: May 15, 2001Assignee: Nalco Chemical CompanyInventors: Scott Lewis Barham, Raymond Leslie Henderson
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Patent number: 6210586Abstract: The present invention relates to novel low molecular weight, structured polymer compositions. The invention also relates to methods for inhibiting scale formation, precipitation or deposition; increasing dispersion of insoluble precipitates in process waters; treating cooling and boiler water; and reducing the viscosity of mineral slurries using the aforementioned polymer compositions.Type: GrantFiled: November 12, 1998Date of Patent: April 3, 2001Inventor: Janice E. LoSasso
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Patent number: 6210585Abstract: A method of separating solids and preventing foaming in an industrial water system comprising adding to fluids in the industrial water system an effective amount of a low foaming latex polymer prepared using a tallow amine ethoxylate/polyoxyethylene oleyl ether emulsifier.Type: GrantFiled: March 30, 2000Date of Patent: April 3, 2001Assignee: Nalco Chemical CompanyInventors: James Morton Tippett, Graeme John Farquharson, Radhakrishnan Selvarajan, John T. Malito
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Patent number: 6165368Abstract: A method for controlling the deposition of foulants such as polynuclear aromatic compounds on the internal surfaces of equipment in a processing train used to process a product stream obtained by dehydrogenating an aliphatic compound containing from 2 to 5 carbon atoms wherein there is introduced into the processing train an effective amount of a liquid solvent having at least one hydroxyl group and a minimum boiling point of about 64.7.degree. C., the solvent being passed through at least a portion of the processing train, after which it is removed from the processing train.Type: GrantFiled: August 19, 1998Date of Patent: December 26, 2000Assignee: Valero Energy CorporationInventor: Robert Zamarripa
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Patent number: 6162391Abstract: An agent for preventing scale formation and a method for preventing scale formation include a polymer which has at least 50% of N-vinyl formamide units or N-vinyl acetamide units and a phosphorus compound added to water in a cooling water system, a boiler water system, or the like. The scale preventing agent and scale preventing method of the present invention are effective in preventing the adherence of various types of scales which are generated in cooling water systems, boiler water systems, and the like. In particular, the present invention is effective in preventing the adherence of silica and calcium scale.Type: GrantFiled: May 21, 1998Date of Patent: December 19, 2000Assignee: Kurita Water Industries Ltd.Inventors: Kenji Kowata, Akira Iimura, Shigeru Sato, Urara Usui, Aya Sakaguchi
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Patent number: 6153106Abstract: The present invention relates to a method for inhibiting the formation and deposition of silica scale in water systems. The method includes treating the water in such water systems with an effective amount of a polyamide that exhibits secondary amine and/or ether and amide functional groups.Type: GrantFiled: March 3, 1999Date of Patent: November 28, 2000Assignee: Nalco Chemical CompanyInventors: Douglas G. Kelley, Kevin J. Moeggenborg, David P. Workman
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Patent number: 6146538Abstract: The present invention relates to the addition of an alkali salt form or a precipitated alkali salt form of a PESA, polymaleic acid or mixture thereof, which is added, directly and/or indirectly, to an oxidizer, e.g. calcium hypochlorite, to inhibit formation of scale, particularly calcium carbonate scale, when the oxidizer contacts water containing carbonate alkalinity. This provides effective inhibition of calcium carbonate in and on oxidizer feed equipment. Process efficiency is greatly enhanced by selecting, as the limiting factor, the concentration of alkalinity present that can be converted to carbonate ions (the carbonate alkalinity). Optimization of the feedrate of polymer based on the carbonate alkalinity results in effective scale inhibition at an LSI value greater than 3.5.Type: GrantFiled: August 19, 1999Date of Patent: November 14, 2000Assignee: United States Filter CorporationInventor: Roy Martin
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Patent number: 6136200Abstract: 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).sbsp.p.sup.(SO.sbsp.4.sup.).sbsp.y.sup.(Aci) (2m+3n)-p-2y].sub.rwhere r=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.Type: GrantFiled: March 11, 1994Date of Patent: October 24, 2000Assignee: Polymer Research CorporationInventor: John J. Waldmann
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Patent number: 6126859Abstract: A method of stabilizing aqueous system solubility of a transition metal salt, polymeric agent corrosion/deposition control combination at neutral pH is disclosed. The addition of an aliphatic hydroxycarboxylic acid to such corrosion/deposition control combinations was found to enhance corrosion/deposition inhibition while providing for a stabile combination at neutral pH.Type: GrantFiled: November 20, 1998Date of Patent: October 3, 2000Assignee: BetzDearborn Inc.Inventors: Matthew M. Hunter, Gregory J. Pomrink, Stephen M. Kessler, Bruce K. Fillipo
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Patent number: 6117929Abstract: A composition is provided herein for preventing or retarding the formation of gas hydrates or for reducing the tendency of gas hydrates to agglomerate, during the transport of a fluid comprising water and a hydrocarbon, through a conduit. The composition is a homopolymer of vinyl caprolactam having the low molecular weight in the range of 500 to 2500, or copolymers thereof, in a defined solvent. Such homopolymers and copolymers preferably are made and applied in the defined solvent, which, most preferably, is a glycol ether such as 2-butoxyethanol.Type: GrantFiled: December 3, 1998Date of Patent: September 12, 2000Assignee: ISP Investments Inc.Inventors: Kirill N. Bakeev, Jui-Chang Chuang, Michael A. Drzewinski, David E. Graham
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Patent number: 6110381Abstract: A treatment for inhibiting the microbial adhesion on surfaces in contact with an aqueous system is disclosed, which comprises adding to the system the combination of a dioctylsulfosuccinate surfactant and a polyoxyethylene-polyoxypropylene block copolymer.Type: GrantFiled: June 2, 1997Date of Patent: August 29, 2000Assignee: BetzDearborn Inc.Inventor: J. Barry Wright
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Patent number: 6090240Abstract: A method of inhibiting calcium carbonate scaling in a multi-stage evaporation plant of black liquor by heat-treating calcium-containing liquor includes a first stage wherein the calcium-containing liquor is heated to about 110-145.degree. C. with direct contact with the heating medium; a second stage wherein the liquor is maintained at this temperature in a retention tank for 1-20 minutes to reduce the amount of calcium in the liquor by precipitating calcium carbonate; and a third stage wherein the heat-treated liquor is evaporated for combustion.Type: GrantFiled: February 20, 1998Date of Patent: July 18, 2000Assignee: Ahlstrom Machinery OyInventors: Henrik Eneberg, Jarmo Kaila, Erkki Kiiskila
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Patent number: 6063288Abstract: 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 an imidazoline or imidazoline derivative.Type: GrantFiled: June 30, 1998Date of Patent: May 16, 2000Assignee: BetzDearborn Inc.Inventor: Donald C. Roe
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Patent number: 6054054Abstract: The inventors have discovered a new method of treating paper machine white water aqueous systems and surfaces in the paper machine white water aqueous systems that prevents or inhibits the adhesion of bacterial cells to the surfaces and thereby controls the biological fouling of the surfaces. The process comprises adding to the aqueous system an adhesion-inhibiting amount of vinyl cationic polymer. This method effectively inhibits the adhesion of the bacterial cells to exposed surfaces without killing the fouling organisms and also without harming non-target organisms. In addition, the method of the present invention advantageously does not cause the formation of harmful substances in the effluent from the systems treated.Type: GrantFiled: March 30, 1995Date of Patent: April 25, 2000Assignee: Nalco Chemical CompanyInventors: Linda R. Robertson, Michael R. St. John
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Patent number: 6051142Abstract: 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 an ethylene oxide-propylene oxide copolymer.Type: GrantFiled: June 30, 1998Date of Patent: April 18, 2000Assignee: Betzdearborn Inc.Inventor: Donald C. Roe
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Patent number: 6042742Abstract: The present invention relates to a composition and method for inhibiting chloride-induced corrosion of and limescale formation on ferrous metals and alloys which contact aqueous solutions, the composition containing a corrosion inhibiting amount of at least one polycarboxylic acid and/or its alkali metal or alkaline earth metal salts and a sufficient amount of a base to bring the aqueous solution to a pH effective to inhibit both chloride-induced corrosion and limescale formation.Type: GrantFiled: June 6, 1995Date of Patent: March 28, 2000Inventors: Michael Whittemore, Gerald LaCosse, Jennifer Riley
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Patent number: 6022401Abstract: Several copolymers of aspartic acid and another monomer provide effective mild steel corrosion inhibitors and scale formation inhibitors under oil field conditions. The copolymers are polymers of modified polyaspartic acid mer units and polyaspartic acid mer units. The resulting polymers are biodegradable.Type: GrantFiled: April 17, 1998Date of Patent: February 8, 2000Assignee: Nalco Chemical CompanyInventors: Jiansheng Tang, Shi-Liang Fu, Daniel H. Emmons
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Patent number: 5993666Abstract: A maleic acid-based copolymer is provided which has a weight-average molecular weight of 1,000 to 100,000, a calcium ion-capturability of 300 mgCaCO.sub.3 /g or higher calculated as calcium carbonate, and a clay-dispersibility of 1.2 or higher. Another maleic acid-based copolymer is also provided which has a level of adsorption to clay within the range of 20 to 90% and a calcium ion-stabilization degree constant of 4.0 or larger.Type: GrantFiled: January 7, 1998Date of Patent: November 30, 1999Assignee: Nippon Shokubai Co., Ltd.Inventors: Shigeru Yamaguchi, Keishi Tsuboi, Yoshio Irie
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Patent number: 5985152Abstract: Ca ion is removed by a cation exchange resin and silica and corrosive ions are removed by an anion exchange resin. Even after the anion exchange resin reaches the silica break through point or after the cation exchange resin reaches the Ca ion break through point, the supply of water is continued until the average of silica concentration or Ca ion concentration reaches a predetermined value. By supplying both treated water before the break through point and treated water after the break through point, water containing silica or Ca ion of suitable concentration can be supplied to the water system with only one anion exchange column or cation exchange column.Type: GrantFiled: December 30, 1997Date of Patent: November 16, 1999Assignee: Kurita Water Industries Ltd.Inventors: Hideo Otaka, Nobuhiro Matsushita
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Patent number: 5979479Abstract: Use of a mixture of at least one alkanolamide of general formula (I), wherein R is a hydrocarbon group having 7-23 carbon atoms, preferably 11-23 carbons atoms, A is an alkyleneoxy group having 2-4 carbon atoms and n is 2-12, preferably 2-8, and at least one alkoxylated alcohol in a weight ratio between the alkoxylated alkanolamide and the alkoxylated alcohol from 10:1 to 1:10, preferably in the range from 5:1 to 1:5 for producing a water-base liquid system with reduced flow resistance between the flowing, water-base liquid system and a solid surface.Type: GrantFiled: September 3, 1997Date of Patent: November 9, 1999Assignee: Akzo Nobel NVInventors: Martin Hellsten, Ian Harwigsson