Anions Patents (Class 210/683)
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Patent number: 5453201Abstract: A water or wastewater purification process is described for reducing selenium and arsenic concentrations in contaminated water or wastewater streams. Iron loaded cation exchange resins, when contacted with contaminated water or wastewater streams are effective to form immobilized complexes with selenite and arsenate contaminants. The iron loaded resins can be easily regenerated by sequential treatment with acid and a solution of a soluble iron salt.Type: GrantFiled: January 14, 1994Date of Patent: September 26, 1995Assignee: Heritage Environmental Servcies, Inc.Inventors: James E. Etzel, Joseph Kurek
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Patent number: 5441646Abstract: Weakly basic anion exchangers of the poly(meth)acrylamide type which have been prepared by aminolysis of poly(meth)acrylonitrile or poly(meth)acrylate with polyamines of defined composition have an improved absorption capacity for sulphate ions and are suitable for selectively removing sulphate ions from aqueous liquids, in particular from sodium chloride brine and from waste waters.Type: GrantFiled: July 19, 1994Date of Patent: August 15, 1995Assignee: Bayer AktiengesellschaftInventors: Harold Heller, Franz-Rudolf Minz, Reinhold M. Klipper, Alfred Mitschker, Heiko Hoffmann
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Patent number: 5441689Abstract: Aqueous solutions of an amine N-oxide such as N-methyl morpholine N-oxide used in the manufacture of regenerated cellulose can be purified by passage through a strongly basic anion-exchange resin. The resin is regenerated by treatment with (1) an aqueous solution of a strong inorganic acid such as hydrochloric or sulphuric acid and (2) an aqueous solution of sodium hydroxide.Type: GrantFiled: May 9, 1994Date of Patent: August 15, 1995Assignee: Courtaulds PLCInventor: Peter R. Laity
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Patent number: 5403492Abstract: The invention provides a method for removing metal oxides and colloidal material from high-resistivity water streams at a relatively high removal efficiency. The method includes hydrating a highly ionized dual morphology ion exchange resin in a macroreticular, desiccated morphology to produce a macroreticular, hydrated morphology. A water stream which is brought into contact with the resin is purified. The water stream may, optionally, also be contacted with both a cation exchange resin and an anion exchange resin.The invention additionally provides a method for selecting ion exchange resins which are particularly suited for use in removing metal oxides from a condensate stream. The method serves to narrow the field of candidates for pilot-scale resin testing with industrial water streams.Type: GrantFiled: September 1, 1993Date of Patent: April 4, 1995Assignee: The Graver CompanyInventors: Eli Salem, Robert Kunin
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Patent number: 5397477Abstract: The invention provides a method for removing metal oxides and colloidal material from high-resistivity water streams at a relatively high removal efficiency. The method includes hydrating a highly ionized dual morphology ion exchange resin in a macroreticular, desiccated morphology to produce a macroreticular, hydrated morphology. A water stream which is brought into contact with the resin is purified. The water stream may, optionally, also be contacted with both a cation exchange resin and an anion exchange resin.The invention additionally provides a method for selecting ion exchange resins which are particularly suited for use in removing metal oxides from a condensate stream. The method serves to narrow the field of candidates for pilot-scale resin testing with industrial water streams.Type: GrantFiled: January 11, 1993Date of Patent: March 14, 1995Assignee: The Graver CompanyInventors: Eli Salem, Robert Kunin
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Patent number: 5378802Abstract: A method of removing ionic impurities from a resist component, comprising the steps of:(a) dissolving said resist component in a solvent;(b) contacting said resist component solution with a fibrous ion exchange resin for a sufficient amount of time to remove at least a portion of said ionic impurities onto said fibrous ion exchange resin; and(c) separating said fibrous ion exchange resin bearing said ionic impurities from said resist component solution.Type: GrantFiled: September 3, 1991Date of Patent: January 3, 1995Assignee: OCG Microelectronic Materials, Inc.Inventor: Kenji Honda
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Patent number: 5376393Abstract: A novel process for the removal of phosphorous from mammalian milk, preferably bovine skim milk, has been developed. The process involves passage of the milk at an elevated temperature through a Type I or Type II macroporous or gel type strong base ion exchange material in the chloride or carbonate form. The weak base anion sites inherent to the ion exchange material have been neutralized. The ion exchange material can easily be regenerated.Type: GrantFiled: February 22, 1994Date of Patent: December 27, 1994Assignee: Abbott LaboratoriesInventors: Christy A. Nardelli, Terrence B. Mazer, Arthur J. C. L. Hogarth, John D. Suh, Leona M. Pickett, Harold W. Keller, William J. Nelson
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Patent number: 5372724Abstract: A process for removing toxic sulfur-containing compounds, ammonia, oil and grease from an aqueous solution wherein the steps include sequentially adding to the solution sufficiently effective amounts of ferrous sulfate, ferric sulfate, and an insoluble hydrophilic amine polymer; heating the solution; removing the oil and grease as volatile organic compounds; and removing the contaminants from the solution as a precipitate complex. The resulting purified effluent may then be directly discharged into an industrial sewer.Type: GrantFiled: September 30, 1993Date of Patent: December 13, 1994Assignee: ECO Asphalt, Inc., a Calif. Corp.Inventor: Saeed Ahmed
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Patent number: 5366636Abstract: A method is provided for treating drinking water for disinfecting and/or removing iodide. The method utilizes resin bound silver ions. For performing the disinfection or iodide removal with minimal release of silver ions into the water being treated, a chelating resin having iminodiacetic acid chelating groups is employed, and the resin is loaded with not over 0.5 mol of silver ion per mol of iminodiacetate.Type: GrantFiled: March 18, 1994Date of Patent: November 22, 1994Assignee: Kansas State University Research FoundationInventors: George L. Marchin, Jack L. Lambert
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Patent number: 5350522Abstract: A method for treating photographic effluent to remove harmful pollutants and which reduces silver and iron ion concentrations in the effluent to no more than about 2 ppm is disclosed. The method includes an oxidation step to convert reducing sulfur compounds to oxidized products; a heavy metal ion precipitation step; a step of adding a developing agent absorbent and a sequestering agent absorbent; and a step of separating a produced solid phase from a liquid phase. The separated Liquid phase is environmentally acceptable.Type: GrantFiled: March 4, 1993Date of Patent: September 27, 1994Assignee: Eastman Kodak CompanyInventor: John R. Fyson
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Patent number: 5350523Abstract: An anion exchange method conducted at a high temperature, which comprises using a crosslinked anion exchanger which comprises structural units having a quaternary ammonium group of the following formula (a) and structural units derived from an unsaturated hydrocarbon group-containing crosslinkable monomer, and of which at least 90% of anion exchange groups are present in the form of a group represented by ##STR1## as defined in the following formula (a): ##STR2## wherein R is a --(CH.sub.2).sub.n --group (n=an integer of from 3 to 18) which may include a cyclic hydrocarbon, each of R.sub.1, R.sub.2 and R.sub.3 which are independent from one another, is a C.sub.1 -C.sub.8 hydrocarbon group or a C.sub.1 -C.sub.8 alkanol group, the benzene ring of the formula (a) may be substituted by an alkyl group or a halogen atom, or may be condensed with other aromatic ring, and X is an anion.Type: GrantFiled: August 28, 1992Date of Patent: September 27, 1994Assignees: Mitsubishi Kasei Corporation, Tohoku Electric Power Co., Inc.Inventors: Masao Tomoi, Atsuo Kiyokawa, Hiromasa Ogawa, Teruo Onozuka, Tsuyoshi Ito
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Patent number: 5336704Abstract: Metal cations absorbed within a hydrogel chelation polymer are insolubilized for safe disposal by treating the polymer with a precipitative anion such as carbonate, aluminate, hydroxide, phosphate, silicate, or sulfide. Further insolubilization of the metal cations may be achieved by subsequent treatment of the polymer with a water-dilutable prepolymer composition such as phenol-formaldehyde resin, then heating to cause cross-linking of the prepolymer. The hydrogel chelation polymer, containing metal sulfide formed by virtue of the insolubilization process, is useful in abstracting from water metals whose sulfides are less soluble than the metal sulfide initially within the polymer.Type: GrantFiled: February 16, 1993Date of Patent: August 9, 1994Inventor: Norman B. Rainer
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Patent number: 5306399Abstract: Spent nuclear reactor coolant system decontamination solutions are first processed to remove the radioactive burden and to separate metallic impurities using cation exchange resins. The cation-processed waste solution is then flowed through an anion exchange resin held between anion-permeable membranes within an electrochemical cell. The application of electric current to the electrochemical cell causes hydroxide ions to replace captured anions held on the ion exchange resin, thereby regenerating the anion exchange resin for subsequent processing. The displaced anions migrate into the anode compartment where they can be oxidized to carbon dioxide for simple disposal.Type: GrantFiled: October 23, 1992Date of Patent: April 26, 1994Assignee: Electric Power Research InstituteInventors: David Bradbury, Christopher J. Wood
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Patent number: 5304638Abstract: A separation medium for use in protein separation comprising a water-insoluble matrix carrying a plurality of polyamine groupings, the polyamine groupings having at least three basic nitrogen atoms, the basic nitrogen atoms being separated from each other by a chain of at least two intervening carbon atoms, there being a total of 5 such intervening carbon atoms when there is a total of three nitrogen atoms in each polyamine group, which may be used for at least partially purifying factor VIII.Type: GrantFiled: December 4, 1991Date of Patent: April 19, 1994Assignee: Central Blood Laboratories AuthorityInventors: Philip J. Marshall, Christopher R. Lowe
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Patent number: 5300685Abstract: A method is provided for removing iodide compounds, particularly alkyl iodide compounds, from iodine-containing liquids, particularly carboxylic acids and anhydrides manufactured by the carbonylation of alcohols, ethers, esters, and the like in the presence of a rhodium catalyst and an alkali metal or alkaline earth metal salt, particularly a lithium salt, wherein the carboxylic acid or anhydride is contacted with a silver or mercury salt coordinated to a polymeric resin containing functional groups having the capability to quaternize with or form ionic salts with the alkyl halides.Type: GrantFiled: November 25, 1991Date of Patent: April 5, 1994Assignee: Hoechst Celanese CorporationInventors: Mark O. Scates, R. Jay Warner, G. Paull Torrence
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Patent number: 5294652Abstract: A process for absorbing silver from photographic hypo solutions involves passing the hypo solution through a bed consisting of a multitude of a sponge product confined within a vessel. The sponge product is derived from an open-celled cellulosic sponge into which there has been incorporated 30% to 80% by weight of a polymer produced by the thermal interaction of polyethyleneimine (PEI) with a polycarboxylic acid. The polymer further contains an activating multivalent cation and between 90% and 300% water. Silver is eluted from the sponge product employing aqueous solutions of a complexing agent such as an ammonium compound or a cyanide compound. Following a water wash, the bed of sponge product is ready for its next cycle of silver absorption.Type: GrantFiled: February 18, 1993Date of Patent: March 15, 1994Inventor: Norman B. Rainer
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Patent number: 5292493Abstract: The present invention provides a process for removing heat stable salts which accumulate in alkanolamine gas purification process units. Surprisingly, it has been found that weakly acidic cationic exchange resins are dramatically more effective for removing heat stable salts from alkanolamine solutions than strongly acidic cationic exchange resins.Specifically, it has been found in accordance with the invention that ion exchange resins are useful for purifying used aqueous alkanolamine solutions, in the following order of preference: Weak Acid IX>Weak Base IX>Strong Acid IX>Strong Base IX.Type: GrantFiled: December 5, 1991Date of Patent: March 8, 1994Assignee: Mobil Oil CorporationInventors: Costandi A. Audeh, Tsoung Y. Yan
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Patent number: 5268155Abstract: A process is disclosed for the removal of heat stable salts from ethanolamine gas purification process units using ion-exchange resins and for regenerating said ion-exchange resins in-situ.Type: GrantFiled: December 16, 1991Date of Patent: December 7, 1993Assignee: Mobil Oil CorporationInventor: Tsoung Y. Yan
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Patent number: 5264132Abstract: Disclosed is a method for removing ammonia, organic amines and alkaline impurities from waste water which comprises using a partially spent ion exchange resin which no longer meets the purity requirements for the production of MTBE, washing the catalyst with water, contacting it with waste water for a an adequate period and removing the purified filtrate.Type: GrantFiled: June 1, 1992Date of Patent: November 23, 1993Assignee: Texaco Chemical CompanyInventors: George P. Speranza, Edward T. Marquis
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Patent number: 5236597Abstract: A method of using rubber, preferably from tire recycling, for absorbing organic carboxylic acids containing from 1 to 3 carbon atoms optionally substituted with from 1 to 5 halogen atoms. Trifluoroacetic acid, for example, can be absorbed very effectively.Type: GrantFiled: December 7, 1992Date of Patent: August 17, 1993Assignee: Solvay Umweltchemie GmbHInventors: Heinz R. Feist, Werner Legat, Hans-Walter Swidersky, Matthias Rieland, Thomas Born, Andrea Feldmann
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Patent number: 5230805Abstract: A method for the preparation of an ion exchange sorbent containing at least one anion exchange resin, a ferromagnetic substance, and a water permeable organic polymer binder, as well as a process for the use of said sorbent to separate removable anions from feedstreams containing said anion.Type: GrantFiled: August 28, 1989Date of Patent: July 27, 1993Assignee: Allied-Signal Inc.Inventors: Stephen F. Yates, William B. Bedwell
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Patent number: 5220058Abstract: This invention relates tot he use of ion exchange resins having metal-exchanged thiol functional groups in removing iodide impurities from carboxylic acids and/or carboxylic acid anhydrides. More particularly, this invention provides a process for removing iodide impurities from liquid carboxylic acids and/or carboxylic acid anhydrides using ion exchange resins in which thiol functional groups have been exchanged with silver, palladium or mercury.Type: GrantFiled: September 30, 1991Date of Patent: June 15, 1993Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventors: Barry B. Fish, William D. Prince, Michael P. Spratt
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Patent number: 5190907Abstract: A granulated inorganic sorbent having the formula:Ti.sub.x Zr.sub.y Sn.sub.1-x-y O.sub.2.nH.sub.2 Owhere 0<x+y<1, x=0-0.95, y=0-0.15, n=0.05-1.8, has a specific surface of 30-250 m.sup.2 /g and represents a solid solution with a rutile type structure characterized by principal peaks at the angle 2.theta. equal to 26.8.+-.0.7, 34.5.+-.1.5, 52.8.+-.1.5 degrees.The method of its manufacture comprises electrolysis of an aqueous solution containing tin chloride, titanium chloride and/or zirconium chloride at a molar ratio Ti:Zr:Sn=(0-0.95):(0.0.15):(0.03-1.0), followed by dropwise dispersion of the formed sol in a gelling liquid at pH.gtoreq.12 and heat treatment of the gel particles at a temperature within 20.degree. to 900.degree. C.Type: GrantFiled: March 29, 1991Date of Patent: March 2, 1993Inventors: Leonid M. Sharygin, Vladimir I. Barybin, Valery F. Gonchar, Olga J. Smyshlyaeva, Anatoly P. Shtin, Sergei Y. Tretyakov, Valery E. Moiseev, Tatyana N. Perekhozhiva, Vladimir M. Galkin, Alma V. Korenkova, Elena I. Zlokazova, Sergei M. Vovk, Valery G. Ponomarev
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Patent number: 5188737Abstract: A solution containing nitrate ion and other anions is contacted with a bifunctional styrene-divinylbenzene three-dimensional copolymer for selectively removing the nitrate ion. The copolymer contains phosphonate and amino groups of the following formulas: ##STR1## wherein R.sup.1 and R.sup.2 stand, independently from each other, for a hydrocarbyl group, and ##STR2## wherein R.sup.3 and R.sup.4 stand, independently from each other, for hydrogen or an alkyl group with the proviso that R.sup.3 and R.sup.4 do not represent hydrogen at the same time.Type: GrantFiled: February 28, 1992Date of Patent: February 23, 1993Assignee: Agency of Industrial Science and TechnologyInventors: Yoshio Sato, Katsuo Murayama, Toshihiro Nakai
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Patent number: 5179063Abstract: A composition (being effective for removing chloride ions from liquids) comprises at least one hydrotalcite and 3-6 weight percent of at least one sodium polyphosphate. Preferably, this composition is prepared by a process comprising the step of calcining a mixture of at least one hydrotalcite and 3-6 weight percent of at least one sodium polyphosphate for about 10-20 hours at a temperature of about 370.degree.-480.degree. C.Type: GrantFiled: February 13, 1992Date of Patent: January 12, 1993Assignee: Phillips Petroleum CompanyInventors: Jesse R. Harris, Gary A. Delzer, Randall A. Porter
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Patent number: 5162084Abstract: Monitoring and controlling the reactivation of an alkanolamine solution containing heat-stable salts of such alkanolamine with stronger acid anions and weaker acid anions by contacting the alkanolamine solution (a) with a strong base anion exchange resin which has a high affinity for stronger acid anions (b) contacting the effluent alkanolamine solution from the strong base anion exchange resin with a second strong base anion exchange resin which has an affinity for weaker acid anions (c) measuring and recording the electrical conductance of the effluent solution from the first mentioned anion exchange resin (d) removing the first mentioned anion exchange resin from service when the conductance of the effluent alkanolamine solution from said resin indicates breakthrough of stronger acid anions in said effluent, (e) measuring and recording the electrical conductance of the effluent alkanolamine solution from the second mentioned anion exchange resin (f) removing the second mentioned anion exchange resin from sType: GrantFiled: October 8, 1991Date of Patent: November 10, 1992Assignee: Conoco Inc.Inventors: Arthur L. Cummings, Fred C. Veatch, Alfred E. Keller, James C. Thompsen, Regina A. Severson
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Patent number: 5152896Abstract: The invention relates to the use of grafted celluloses, in fibrous form, particularly paper, non-woven web, flock, yarn, woven fabric, comprising quaternary ammonium functions, for eliminating humic substances and nitrates contained in natural water or industrial sewage.The grafted cellulose is for example obtained by radical grafting with the aid of a non-saturated monomer with quaternary ammonium function, particularly quaternized diethyl-amino-ethyl methacrylate.Its capacity is greater than or equal to 0.2 meq/g.Type: GrantFiled: January 14, 1991Date of Patent: October 6, 1992Assignee: Institut Textile de France-Centre Technique IndustrielInventors: Michel Mazet, Isabelle Rigaudie, Daniel Wattiez, Roger Chatelin, Jean-Francois Combes, Louis Gavet
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Patent number: 5139981Abstract: This invention relates to a method for removing halides from liquid carboxylic acid contaminated with a halide impurity by contacting the liquid halide-contaminated acid with a silver(I)-exchanged macroreticular resin. The halide reacts with the resin-bound silver and is removed from the carboxylic acid stream. The present invention also relates to an improved method for producing silver-exchanged macroreticular resins suitable for use in the present invention.Type: GrantFiled: June 26, 1991Date of Patent: August 18, 1992Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Jonathan J. Kurland
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Patent number: 5124044Abstract: Immobilized ferric hydroxide selectively removes phosphate from aquarium water. The material provides a healthier environment and retards growth of undesirable algae and bacteria.Type: GrantFiled: January 9, 1991Date of Patent: June 23, 1992Assignee: Precision Aquarium Testing Inc.Inventors: Edward J. Cassidy, Ronald D. Jones
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Patent number: 5096871Abstract: Alumina-containing acid adsorbents and process for producing same. The adsorbents comprise activated alumina and an amorphous alkali (preferably sodium) aluminum silicate. The ratio of Si:Al in the amorphous material is preferably 0.25-100:1 by weight. A process for producing such adsorbents comprises treating activated alumina with a solution of an alkali metal silicate followed by an alkali metal aluminate, and forming agglomerates of the treated alumina at a temperature below about 90.degree. C., aging the agglomerates at a temperature in the range of 20.degree.-90.degree. C., and calcining the aged agglomerates at a temperature in the range of 200.degree.-500.degree. C. The adsorbent can be used to remove acidic materials from gases and liquids during industrial processes.Type: GrantFiled: July 3, 1990Date of Patent: March 17, 1992Assignee: Alcan International LimitedInventors: Gordon Lever, Claude P. Etchart, Francoise Tahiani
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Patent number: 5085780Abstract: A process for removing anionic contaminants from an aqueous fluid having a pH up to about 12, the fluid being passed through a filter media whereby the contaminants are electrokinetically captured and adsorbed onto the media, such a media comprising cellulose fiber and silica based particulate or fiber filter elements and a charge modifying amount of a cationic charge modifying system bonded to the surfaces thereof. One component of the charge modifying system is a primary charge modifying agent characterized as a water soluble organic polymer capable of being adsorbed into the filter elements and having a molecular weight greater than about 1000. Each monomer of the polymer can have at least one epoxide group capable of bonding to the surface of the filter elements and at least one quaternary ammonium group. A portion of the epoxy groups on the organic polymer are bonded to the secondary charge modifying agent.Type: GrantFiled: November 27, 1990Date of Patent: February 4, 1992Assignee: Cuno, IncorporatedInventor: Eugene A. Ostreicher
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Patent number: 5084185Abstract: The present invention relates to a method of reducing the concentration of contaminant ions, preferably nitrates ions, in impure water. The method comprises steps of: a) passing the impure water through an ion exchange resin to substitute regenerant ions from the resin for dissolved contaminant ions; b) passing a relatively dilute aqueous solution of wash-out ions through said resin to substitute wash-out ions for contaminant ions bound to the resin and; c) passing a relatively concentrated aqueous solution of regenerant ions through said resin to substitute regenerant ions for wash-out ions bound to the resin. The affinity of the resin to wash-out ions diminishes from being greater than that for contaminant and regenerant ions when exposed to a relatively dilute ionic solution to being less than that for said contaminant and regenerant ions when exposed to a relatively concentrated ionic solution.Type: GrantFiled: July 10, 1989Date of Patent: January 28, 1992Assignee: The South Staffordshire Waterworks CompanyInventors: George S. Solt, Andrzej W. Nowosielski-Slepowron
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Patent number: 5082602Abstract: Cations and anions contained as impurities in a spent organic solvent can be removed by an alkaline aqueous solution passing through inside of hydrophobic porous membrane such as hollow fibers for capturing anions and by an acidic aqueous solution passing through inside of hydrophobic porous membrane such as hollow fibers for capturing cations at the same time so as to regenerate the organic solvent. An apparatus suitable for removing cations and anions simultaneously from the spent organic solvent is also provided.Type: GrantFiled: August 20, 1986Date of Patent: January 21, 1992Assignee: Hitachi, Ltd.Inventors: Naohito Uetake, Ietsugu Sekine, Haruo Hasimoto, Tetsuo Fukasawa, Hajime Iba
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Patent number: 5082570Abstract: A regenerable inorganic media capable of removing contaminants by catalytic oxidation or reduction, as well as heavy metal adsorption, from well and surface water sources. The specific material is specially-treated microporous battery grade gamma-form electrolytic manganese dioxide, the treatment involving comminuting to a 20-60 mesh size, complete neutralization and washing to remove fines, residual acidity and neutralization products. Certain taste, odor and staining water contaminants such as hydrogen sulfide, iron and manganese can be oxidized and filtered by the media with subsequent removal from the system by simply backwashing with water or water in combination with simple chemicals. Heavy metals are removed by a different adsorption mechanism on the same media followed by regeneration with a dilute acid. Pretreatment of the media with sodium hydrosulfite further allows the removal of residual chlorine.Type: GrantFiled: December 24, 1990Date of Patent: January 21, 1992Assignee: CSA Division of Lake Industries, Inc.Inventors: Irwin R. Higgins, Mark S. Denton
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Patent number: 5080800Abstract: A dispensing device having a container body defining a solution retaining chamber therein, the container having an outlet for dispensing the solution from the chamber and means for removing a component from the solution as the solution is dispensed from the chamber through the container outlet.Type: GrantFiled: March 18, 1991Date of Patent: January 14, 1992Assignee: Ciba-Geigy CorporationInventors: Barbara L. Heyl, Lynn C. Winterton, Kai C. Su, Jack C. White
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Patent number: 5078889Abstract: A process using a regenerable inorganic media capable of removing contaminants by catalytic oxidation or reduction, as well as heavy metal adsorption, from well and surface water sources. The specific material is specially-treated gamma-type electrolytic manganese dioxide, the treatment involving comminuting to a 20-60 mesh size, complete neutralization and washing to remove fines, residual acidity and neutralization products. Certain taste, odor and staining water contaminants such as hydrogen sulfide, iron and manganese can be oxidized and filtered by the media with subsequent removal from the system by simply backwashing with water or water in combination with simple chemicals. Heavy metals are removed by a different adsorption mechanism on the same media followed by regeneration with a dilute acid. Pretreatment of the media with sodium hydrosulfite further allows the removal of residual chlorine.Type: GrantFiled: October 17, 1990Date of Patent: January 7, 1992Assignee: CSA Division, Lake Industries, Inc.Inventors: Irwin R. Higgins, Mark S. Denton
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Patent number: 5077067Abstract: A process for the selective and quantitative elimination of lactoglobulins from a starting material containing whey proteins, wherein the starting material is brought into contact with a strongly basic type anion exchanger, the pH of the starting material being between 4 and 6 when the ash content of the starting material is between 0 and at most 1% by weight, and between 6 and 8 when the ash content is between more than 1% and 3% by weight, so as to retain the lactoglobulins selectively and quantitatively on the anion exchanger, the anion exchanger on which the lactoglobulins are retained is separated from the remainder of the starting material and the remainder, free from lactoglobulins, is collected.Type: GrantFiled: May 18, 1990Date of Patent: December 31, 1991Assignee: Union des Cooperatives Laitieres D'Isigny-Sur-Mer et de Sainte-Mere-EgliseInventor: Philippe A. Thibault
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Patent number: 5071563Abstract: A method for removing sulfate ions from an aqueous solution of an alkali metal chloride is disclosed, in which the aqueous solution of the alkali metal chloride containing sulfate ions and zirconium hydrous oxide are brought into contact with each other in a slurry form under acidic conditions to thereby cause the sulfate ions to be adsorbed to the zirconium hydrous oxide by an ion exchange reaction, the zirconium hydrous oxide adsorbing sulfate ions is separated from the aqueous solution and then dispersed in another aqueous liquid to thereby cause it to react with an alkali so as to cause sulfate ions to be desorbed into the aqueous liquid. According to this method, adsorption and desorption take place rapidly and efficiently.Type: GrantFiled: October 31, 1990Date of Patent: December 10, 1991Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Minoru Shiga, Toshiji Kano, Takamichi Kishi
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Patent number: 5062957Abstract: A process for the selective removal of nitrates from water using a combination of an ion exchange resin and a biological purification. In the process, an ion exchanger in the sulfate form is used to selectively remove nitrate ions from the water to be treated. Following regeneration of the ion exchanger, the regeneration eluent containing the nitrates fixed by the selective resin is subjected to biological purification.Type: GrantFiled: May 3, 1990Date of Patent: November 5, 1991Inventor: Edgar Berreby
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Patent number: 5053138Abstract: There is disclosed a process for purifying aqueous solutions of N-methyl-morpholine N-oxide (NMMO), such as spinning bath solutions incurred in the production of cellulose products, in which process the solutions to be purified are contacted with an anion exchanger and the purified solutions are separated from the anion exchanger. The process is carried out in one step and the anion exchanger, as functional groups, exclusively contains quaternary tetraalkylammonium groups of the formulae--CH.sub.2 --N.sup..sym. (CH.sub.3).sub.3 X.sup..crclbar. or --CH.sub.2 --N.sup..sym. [(CH.sub.3).sub.2 (CH.sub.2 OH)]X.sup..crclbar.wherein X.sup..crclbar. represents the anion of an inorganic or organic acid. After this, the anion exchanger is regenerated with an aqueous acidic solution.Type: GrantFiled: October 11, 1990Date of Patent: October 1, 1991Assignee: Lenzing AktiengesellschaftInventors: Dietmar Korger, Dieter Eichinger, Stephan Astegger, Karin Weinzierl, Johann Manner
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Patent number: 5051189Abstract: A method of modifying the adsorptive characteristics of an adsorptive surface comprising the in situ precipitation of a polyvalent metal salt from a solution in contact with the adsorptive surface; the adsorptive product produced thereby and methods for the removal of impurities from aqueous materials by contact with the adsorptive product.Type: GrantFiled: November 27, 1989Date of Patent: September 24, 1991Assignee: University of FloridaInventor: Samuel R. Farrah
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Patent number: 5039423Abstract: Provided is a process for the disinfection of raw water with chlorine dioxide and the removal of virtually all disinfection by-products. The process comprises contacting the water to be purified with a sufficient amount of gaseous chlorine dioxide to kill any microorganisms and thereby disinfect the water. The water is then stripped with air to remove ClO.sub.2 and any organic chemicals, with the resulting water then being contacted with a strong anion exchange resin to remove any by-products such as chlorite and chlorate ions formed in the disinfection process. The integrated process efficiently and effectively provides a water product which can contain essentially no chlorine dioxide, chlorite ions, chlorate ions or trihalomethanes, and which also is fully disinfected.Type: GrantFiled: May 11, 1990Date of Patent: August 13, 1991Assignee: International Dioxcide, Inc.Inventor: Joseph M. Kelley
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Patent number: 5021163Abstract: Anions containing sulfur and oxygen, e.g. thiosulfate, can be catalytically reduced using a protonated anion ion exchange resin as a catalyst. The process is preferably conducted in an aqueous system and at a pH below about 8.Type: GrantFiled: July 25, 1990Date of Patent: June 4, 1991Assignee: Eastman Kodak CompanyInventors: Ernest R. Anderson, Dominick Vacco, Thomas J. Dagon
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Patent number: 5008224Abstract: An amorphous substance obtained by mixing volcanic ash with or without added clay and water and, if necessary, a surfactant, kneading the mixture, and shaping and firing. Additives such as camphor or naphthalene may be included prior to firing for plasticity and to form pores. The resultant mixture possesses an ability to adsorb phosphorus selectively. When this substance is placed in contact with a phosphorus-containing liquid, it removes phosphorus from the liquid.Type: GrantFiled: June 30, 1989Date of Patent: April 16, 1991Assignees: Agency of Industrial Science and Technology, Ministry of International Trade and IndustryInventors: Eiji Watanabe, Nasakazu Horio, Kenzi Suzuki
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Patent number: 4999113Abstract: A process is provided for the selective removal of thiocyanate ions from a vanadium-containing loaded scrubbing solution used for oxidative hydrogen sulfide scrubbing. The thiocyanate ions are removed by means of an ion exchanger making reuse of the scrubbing solution possible. In this process, the ion exchanger can be loaded until the inlet and outlet concentrations of the thiocyanate ions are substantially the same.Type: GrantFiled: November 17, 1989Date of Patent: March 12, 1991Assignee: Linde AktiengesellschaftInventor: Gunter Weber
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Patent number: 4968394Abstract: A process for reducing excess nitric acid in an aqueous hydroxylamine nitrate solution. The process is conducted by reacting the aqueous hydroxylamine nitrate solution with a basic neutralizing agent such as nitric oxide, hydroxylamine vapor or a mixture thereof or by contacting the aqueous hydroxylamine nitrate solution with an anion exchange resin having a pKa in the range of from about 5 to about 9. The aqueous hydroxylamine nitrate solution may be produced by the electrolysis of nitric acid.Type: GrantFiled: July 5, 1989Date of Patent: November 6, 1990Assignee: Olin CorporationInventors: Ronald L. Dotson, Debra Y. Hernandez, Ronald A. Sasse
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Patent number: 4965061Abstract: A process for producing hydrofluoric acid from SiF.sub.6.sup.2- in a wastewater is disclosed. The process is carried out by(i) combining (NH.sub.4).sub.2 SO.sub.4, at a pH high enough such that the sulfate is in its divalent state, with SiF.sub.6.sup.2- from said wastewater in an amount in excess of that stoichiometrically required to form (NH.sub.4).sub.2 SiF.sub.6 as follows:(NH.sub.4).sub.2 SO.sub.4 +SiF.sub.6.sup.2- .fwdarw.(NH.sub.4).sub.2 SiF.sub.6 +SO.sub.4.sup.2-(ii) concentrating a solution including (NH.sub.4).sub.2 SiF.sub.6 and excess (NH.sub.4).sub.2 SO.sub.4 to precipitate and separate (NH.sub.4).sub.2 SiF.sub.6 of high purity therefrom;(iii) re-solubilizing the (NH.sub.4).sub.2 SiF.sub.6 for reaction with NH.sub.4 OH to form NH.sub.4 F liquor and precipitated Si(OH).sub.4 ;(iv) separating the NH.sub.4 F liquor from the precipitated Si(OH).sub.4 ;(v) reacting the NH.sub.4 F with water to form precipitated NH.sub.4 F.multidot.HF and ammonia gas;(vi) reacting NH.sub.4 F.multidot.Type: GrantFiled: January 30, 1989Date of Patent: October 23, 1990Assignee: Florida Recoveries PartnershipInventors: William W. Berry, Gordon J. Rossiter
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Patent number: 4944878Abstract: A method for nitrate decontamination of water which involves passing the water through a bed of alkyl phosphonium anion exchange resin which has pendant alkyl groups of C.sub.3 or larger.Type: GrantFiled: November 16, 1989Date of Patent: July 31, 1990Assignee: Iowa State University Research Foundation, Inc.Inventors: James E. Lockridge, James S. Fritz
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Patent number: 4939000Abstract: A method for regenerating a carbon slurry used to produce a black matrix-type phosphor screen of a cathode ray tube is disclosed, in which excess carbon slurry is collected after the completion of a carbon-coating process onto a cathode ray tube panel. This collected carbon slurry is regenerated by means of an ion-exchange resin.Type: GrantFiled: August 22, 1989Date of Patent: July 3, 1990Assignee: Sony CorporationInventors: Robert E. Dodds, Tsutomu Inose, Yoshimitsu Kato
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Patent number: 4929381Abstract: A novel anion exchange material comprising substantially crystalline inorganic mixed metal hydroxides and mixed metal hydrated oxides exhibiting anion exchange properties at temperatures up to about 150.degree. C. and a method of preparing the same is disclosed. The anion exchanger composition is prepared by coprecipitating hydroxides or hydrated oxides of metal elements such as aluminum and titanium and then drying the mixed metal hydroxides or hydrated oxides.Type: GrantFiled: March 1, 1988Date of Patent: May 29, 1990Assignee: The Dow Chemical CompanyInventor: Howard W. Clark