Anions Patents (Class 210/683)
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Patent number: 6432314Abstract: Anion exchange material surfaces are provided with zwitterionic and cationic groups, preferably by coating with a polymer formed from monomers including a zwitterionic monomer, a cationic monomer and, optionally, a termonomer providing stable binding at the substrate surface. The ion exchange materials may be used to scavenge heparin from blood by an ion exchange separation process. The zwitterionic group reduces the rate of fouling by biological materials such as proteins.Type: GrantFiled: July 26, 1999Date of Patent: August 13, 2002Assignee: Biocompatibles LimitedInventors: Joachim Storch, Robert Neil Hanley, Richard Neil Templar Freeman
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Patent number: 6432374Abstract: The invention has an object to provide a solid chloride absorbent which can efficiently absorb inorganic chlorides such as hydrogen chloride flowing out from a process in which a heavy naphtha and the like are treated and inorganic chloride derived from crude oil, and which is difficult to powder and soften after absorbing the chlorides. The solid chloride absorbent according to the invention comprises zinc oxide, a porous refractory inorganic matter and an inert binder, has a long life, and hardly releases the absorbed chlorides.Type: GrantFiled: November 28, 2001Date of Patent: August 13, 2002Assignees: Süd-Chemie Catalysts Japan, Inc., Japan Energy CorporationInventors: Tsuneyoshi Takase, Nobuyashi Hayashi, Yasushi Shioya, Kaoru Fujiwara, Mitsuhiro Ohashi
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Patent number: 6416672Abstract: Small amorphous silica particles are used to provide a relatively large surface area upon which silica will preferentially adsorb, thereby preventing or substantially reducing scaling caused by deposition of silica on evaporative cooling tower components, especially heat exchange surfaces. The silica spheres are contacted by the cooling tower water in a sidestream reactor, then separated using gravity separation, microfiltration, vacuum filtration, or other suitable separation technology. Cooling tower modifications for implementing the invention process have been designed.Type: GrantFiled: August 25, 2000Date of Patent: July 9, 2002Assignee: The Regents of the University of CaliforniaInventor: William S. Midkiff
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Patent number: 6383395Abstract: A media is used to remove species from aqueous solutions, particularly in the treatment of water to enable it to be suitable for drinking. The media includes a material selected from the group consisting of zirconium hydroxide, titanium hydroxide, hafnium hydroxide and combinations thereof. A preferred form of the media is a layer having an aspect ratio of at least 1:1, more preferably, at least about 10:1. Removed from the water are species selected from the group consisting of arsenate, selenate, chromate, borate, perchlorate, fluoride and combinations thereof. In particular arsenite (As+3) containing species are also removed from water. Arsenite may be removed from water to levels not greater than 10 parts per billion with a single exposure to the media. The media is selective for certain species over others.Type: GrantFiled: January 4, 2000Date of Patent: May 7, 2002Assignee: Luxfer Group LimitedInventors: Stephen R. Clarke, Richard J. Clarke, Roderick Murdock, Clive J. Butler, Sam Mohanta
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Patent number: 6379556Abstract: The recovery of iodide from chemical process wastewater is accomplished by loading the wastewater containing iodide onto a strongly basic anion-exchange resin in free-base form; eluting the sorbed iodide from the resin with aqueous strong acid (e.g., hydrochloric acid); loading the iodide-rich cuts onto a weakly basic anion-exchange resin in free-base form; and eluting the sorbed iodide with aqueous base (e.g., sodium hydroxide). The recovered iodide typically has sufficient purity to permit its re-use in the chemical process.Type: GrantFiled: September 13, 1999Date of Patent: April 30, 2002Assignee: Merck & Co., Inc.Inventors: Ed Venkat, Ralph J. Magliette, Donald McKinney, Alan S. Michaels
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Patent number: 6375851Abstract: The invention includes an operating method for the continuous purification of a liquid utilizing either single or dual ion exchange vessels, each vessel being physically divided into one or more discrete of ion exchange zones, each zone having an inlet and an outlet. A valving means at the inlet and outlet of each ion exchange zone provides communication between adjacent ion exchange zones as well as to feed, product, water and regenerant chemical streams. In one aspect of this invention a first vessel contains a discrete plurality of cation exchange zones and a second vessel contains a discrete plurality of anion exchange zones. In another aspect of this invention, a single vessel contains a plurality of discrete cation exchange zones and a plurality of discrete anion exchange zones. In another aspect of the invention, each ion exchange zone is contained within a single vessel.Type: GrantFiled: May 5, 2000Date of Patent: April 23, 2002Assignee: United States Filter CorporationInventors: Julie G. Sterling, Thomas K. Mallmann, Ronald N. White, Brian D. Burris, Steven M. Johnson
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Patent number: 6350383Abstract: A material and method for removal of environmental oxyanions (and especially phosphates), the material comprising a substrate such as a clay modified with complexing elements selected from Group IIIB, Group IVB, and lanthanide elements (or a mixture of such elements). The resultant modified substrate can bind oxyanions and make them unavailable for utilisation in the environment; in the case of phosphates, by algae and the like. The method includes forming a capping of material at the sediment/water interface, applying the material in the form of pellets at the sediment/water interface, or injecting the pellets into the sediment.Type: GrantFiled: September 20, 1999Date of Patent: February 26, 2002Assignee: Commonwealth Scientific and Industrial Research OrganisationInventor: Grant Brian Douglas
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Publication number: 20020002207Abstract: There is described a group of underquarternized anion exchange resins having the ability to bind with and remove from one environment to another a significant fraction of scavenged molecules by forming covalent bonds with the molecules. The method of using such underquarternized resins is also described.Type: ApplicationFiled: January 26, 2001Publication date: January 3, 2002Inventor: Steven L. Regen
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Patent number: 6334886Abstract: A process is provided for removing CO2 and/or H2S from a gas mixture containing as impurities CO2 and/or H2S and at least one other impurity selected from the group consisting of a cyanide and ammonia. The process includes contacting at least a portion of the reflux stream from the overhead vapor from a stripping column of an acid gas removal solvent (i.e., alkanolamine) treatment plant with an anion exchange resin to remove corrosive impurities. The ion-exchanged reflux stream is then recycled to the top of the stripping column or into the bulk circulating acid gas removal solvent (i.e., alkanolamine) passing from the bottom of the stripping column.Type: GrantFiled: May 12, 2000Date of Patent: January 1, 2002Assignee: Air Products and Chemicals, Inc.Inventors: David Richard Barnes, Jr., Arthur Daniel Bixler
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Publication number: 20010054588Abstract: A method for purifying contaminated water involves passing contaminated water through a porous bed of steel slag. The steel slag can be used to remove various contaminants or reduce the concentration of such contaminants, such as heavy metals (for example, hexavalent chromium), chlorinated organic compounds, and certain inorganic anions. The method preferably involves placing an underground barrier of a porous bed of steel slag in a flow path of contaminated groundwater then allowing contaminated groundwater to pass through the barrier to purify the contaminated groundwater. The slag particles may be used as produced with no further grinding necessary, although the slag may be passed through a sieve or sieves to obtain a set of slag particles having a median diameter of about ⅛ inch to 1 inch, and preferably between about ¼ inch to ⅜ inch. Due to the inherent permeability of slag, no additive need be mixed with the slag.Type: ApplicationFiled: July 1, 1999Publication date: December 27, 2001Applicant: JAMES S. SMITHInventor: JAMES S. SMITH
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Patent number: 6245128Abstract: A process for the reclamation of spent aqueous alkanolamine solutions by contacting a spent aqueous alkanolamine solution with a strong base ion exchange resin for time sufficient to sorb from the aqueous alkanolamine solution at least a portion of the accumulated ions and after a high concentration of ions accumulate on the resin, regenerating the strong base ion exchange resin by: a) purging the resin with water or nitrogen, b) contacting the strong base ion exchange resin with a sodium chloride solution for a time sufficient to remove the ions, c) purging the resin to remove the sodium chloride solution, d) contacting the resin with an alkali metal hydroxide solution, preferably sodium hydroxide, for a time sufficient to convert the resin to a substantially hydroxide form; and e) purging the resin, wherein the ion sorption capacity of the resin is maintained at a substantially constant value.Type: GrantFiled: June 15, 1999Date of Patent: June 12, 2001Assignee: Mobil Oil CorporationInventor: Joseph T. George, Jr.
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Patent number: 6241893Abstract: An amorphous potassium aluminosilicate filtration media which may be mixed with activated carbon filters water to remove oxygen, chlorines, hardness, alkalinity, ammonia, hydrogen, hydrogen sulfide, sodium sulfite and other contaminants. The particular sodium aluminosilicate is a porous amorphous material formed under ultraviolet light or sunlight to produce pore sizes of 60 Å to 250 Å at ambient temperatures (20° C.-35° C.) and low relative humidity (5%-20%). The media is initially formed as a microporous primarily amorphous gel containing Na2O, Al2O3, SiO2 and H2O. The sodium therein is displaced by potassium, whereby the filter removes impurities from water without introducing sodium. The potassium aluminosilicate may be a second stage filter to a first stage filter composed of a strong base anion media charged with potassium carbonate and/or bicarbonate.Type: GrantFiled: March 18, 1997Date of Patent: June 5, 2001Inventor: Ehud Levy
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Patent number: 6217771Abstract: A method for removing corrosive contaminants from a polar extraction solvent comprises adding water to the solvent to provide a mixture. Then the mixture is contacted with a basic ion exchanger resin to remove the corrosive contaminants. The solvent is recovered and may be reused.Type: GrantFiled: October 15, 1999Date of Patent: April 17, 2001Assignee: Exxon Research and Engineering CompanyInventors: Joseph P. Boyle, David C. Hager, Alan R. Katritzky
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Patent number: 6211408Abstract: Macroporous, strong-acid polysiloxane ion exchange resins which have been converted to the silver or mercury form are utilized to remove iodides from non-aqueous organic media. In a particularly preferred method, hexyl iodide is removed from acetic acid.Type: GrantFiled: March 24, 1999Date of Patent: April 3, 2001Assignee: Celanese International CorporationInventor: Charles B. Hilton
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Patent number: 6203709Abstract: Systems and methods for removing oxyanionic contaminants, such as arsenate (As(V)) and selenite (Se(IV)), from polluted water. The system utilizes calcium alginate which has been doped with ferric iron. The system is operated as either a batch-type or continuous feed purifier. A dehydrator is included for drying spent absorbent beads to form a dry disposable solid waste product.Type: GrantFiled: November 12, 1998Date of Patent: March 20, 2001Assignee: California Institute of TechnologyInventors: Joon H. Min, Janet G. Hering
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Patent number: 6200479Abstract: The invention is for a process of removing acid salt contaminants from a resin solution. The process comprises providing an organic solution of a phenolic resin having a portion of its phenolic hydroxyl groups condensed with an acid halide in the presence of a base catalyst. The organic solutions is then contacted with a strong acid cation exchange resin and a base anion exchange resin for a time sufficient to remove essentially all of said acid salt contaminants. Acid salt contamination is reduced to a level below normal detection limits.Type: GrantFiled: January 14, 1997Date of Patent: March 13, 2001Assignee: Shipley Company, L.L.C.Inventors: Anthony Zampini, Harold F. Sandford
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Patent number: 6200480Abstract: The present invention is directed to a process of removing trace acidic impurities from an impure solution of photoacid generating compounds in a solvent, comprising contacting an impure solution of at least one photoacid generating compound containing trace amounts of acidic impurities with an amine-containing ion exchange resin for a sufficient amount of time to remove substantially all of the acidic impurities from the impure solution, thereby producing a pure solution of at least one photoacid generating compounds substantially free of trace acidic impurities. The invention is also directed to a solution of at least one photoacid generating compound substantially free of trace acidic impurities made by the above process.Type: GrantFiled: January 13, 1998Date of Patent: March 13, 2001Assignee: Arch Specialty Chemicals, Inc.Inventors: Lawrence Ferreira, Sanjay Malik
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Patent number: 6190562Abstract: For the removal of trace quantities of iodine-containing contaminants from corrosive liquid feed streams, an alternative with distinct advantages over the prior art is provided. The treatment method involves the use of a crystalline manganese phosphate which has been cation-exchanged with an iodine-reactive metal. This inorganic adsorbent may be used in unbound form, or it can bound with a substantially insoluble porous inorganic refractory metal oxide binder. A reactivation technique for this material is also presented.Type: GrantFiled: March 24, 1999Date of Patent: February 20, 2001Assignee: UOP LLCInventors: Santi Kulprathipanja, Gregory J. Lewis, Richard R. Willis
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Patent number: 6190561Abstract: A method of coagulating particulates, as in papermaking or water clarification applications, for example, is provided wherein a zeolite crystalloid coagulant is added to water containing the solid matter, a source of multivalent cations, and a cationic acrylamide polymer. The zeolite crystalloid coagulant is preferably prepared by admixing aqueous sodium silicate and sodium aluminate solutions to form a reaction mixture and allowing a reaction to proceed for a sufficient time to form a zeolite crystalloid coagulant particles having particle sizes of at least about 4 nm before terminating the reaction.Type: GrantFiled: February 17, 1998Date of Patent: February 20, 2001Assignee: Sortwell & Co., part interestInventor: Leo E. Nagan
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Patent number: 6190503Abstract: Wastewaters and circulation waters in papermaking, in deinking and in pulp bleaching are treated by adsorption of water-soluble anionic compounds and compounds dispersed in water from the wastewaters and circulation waters over finely divided adsorbents which consist of insoluble, only slightly swellable polymers which contain polymerized vinylamine units, and these polymers are used as adsorbents for treating water circulations in papermaking and for treating paper machine wastewaters and wastewaters from the deinking process and from pulp bleaching.Type: GrantFiled: March 19, 1999Date of Patent: February 20, 2001Assignee: BASF AktiengesellschaftInventors: Friedrich Linhart, Manfred Niessner, Martin Rübenacker, Claudia Nilz
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Patent number: 6187205Abstract: The invention concerns a method of decontaminating a photographic effluent. The method comprises contacting the effluent with a fibrous polymeric alumino-silicate and, optionally, with a cerium-based catalyst on an activated carbon membrane. The iron, silver, thiosulphate and organics contents of photographic effluents are reduced.Type: GrantFiled: June 5, 1998Date of Patent: February 13, 2001Assignee: Eastman Kodak CompanyInventors: Didier J. Martin, Oliver J. Poncelet, Jeannine Rigola
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Patent number: 6183638Abstract: Provided is a process for the preparation of an ultrapure hydrogen peroxide solution. The process includes at least one sequence which includes successively passing a solution to be purified through at least one bed of cation-exchange adsorbents (CEA) and at least one bed of anion-exchange adsorbents (AEA). The beds of adsorbents each exhibit a height to diameter ratio of greater than 3. Also provided is a plant for the implementation of the inventive process.Type: GrantFiled: March 22, 1999Date of Patent: February 6, 2001Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges ClaudeInventors: Henry Ledon, Christine Devos
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Patent number: 6159376Abstract: A method and apparatus for the treatment of wastewater effluent from a laundromat combines multiple filtering, particularly including, bag filters, to remove particulates including fine particulates followed by treatment in a weak base anion exchange resin bed to remove MBAS. The weak base resin was found to remove MBAS and organics such as LAS which were highly de-adsorbed in the efficient regeneration of the resin. The weak base anion exchange resin is preferably macroporous in the sulfate form. The invention contemplates multiple bag filters of different degrees of coarseness.Type: GrantFiled: September 11, 1998Date of Patent: December 12, 2000Assignee: I.P. Licensing, Inc.Inventor: William J. Lahti
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Patent number: 6136199Abstract: Phosphates and chromates are selectively removed from contaminated water by a new class of sorbent, referred to as a Polymeric Ligand Exchanger (PLE). The exchanger bed comprising a styrene-divinylbenzene or polymethacrylate matrix having an electrically neutral chelating functional group with nitrogen or oxygen donor atoms, and a Lewis-acid type metal cation, such as copper, bonded to the chelating functional group in a manner that the positive charges of the metal cation are not neutralized. PLEs are very selective toward phosphates and chromates, chemically stable, and also amenable to efficient regeneration.Type: GrantFiled: December 7, 1998Date of Patent: October 24, 2000Assignee: Julius James JablonskyInventors: Arup SenGupta, Dongye Zhao
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Patent number: 6129846Abstract: An activated carbon-crystalline titanium and/or tin silicate composite for purifying waste streams and method of making. The method involves providing a combination of a synthetic carbon precursor, and titanium and/or tin silicate, followed by curing, carbonizing, and activating the carbon precursor. The composite is used to purify fluid streams such as water, of pollutants such as VOC's, heavy metals such as lead, and chlorine.Type: GrantFiled: November 2, 1998Date of Patent: October 10, 2000Assignee: Corning IncorporatedInventor: Kishor P. Gadkaree
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Patent number: 6123850Abstract: The subject matter of the present invention is a process for the purification of a virtually anhydrous organic liquid other than DMSO alone, in order to decrease its content of alkali and alkaline-earth metal and metal cations, characterized in that it consists essentially in placing this organic liquid in contact with one or more cation exchange resins and in then separating from the resin(s) the purified organic liquid, said resin or at least one of said resins being a sulphonic resin in --SO.sub.3 H or --SO.sub.3 NH.sub.4 form based on a polystyrene-divinylbenzene copolymer having a divinylbenzene content of from 50 to 60% by weight, without taking the sulphonic groups into account.Type: GrantFiled: May 14, 1998Date of Patent: September 26, 2000Assignee: Elf AtochemInventors: Annie Commarieu, Francis Humblot
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Patent number: 6080319Abstract: A method is provided for removing contaminants from water. The method comprises contacting the contaminants in the water with an organoclay having a positive or negative charge on its surface. Using this method, organic and inorganic contaminants can be removed with such charged organoclays.Type: GrantFiled: June 18, 1998Date of Patent: June 27, 2000Assignee: Biomin Inc.Inventor: George Alther
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Patent number: 6080314Abstract: A septic system and method for the removal of nitrogen contaminants, such as nitrates and ammonia, from a wastewater effluent, which system and method includes employing one or more zeolite tanks, which contains a regenerable, granulated zeolite material to receive wastewater effluent from a septic tank, and to capture the nitrogen contaminants, such as nitrate and ammonia, and retain the nitrogen contaminants in the zeolite material allowing the treated, decontaminated effluent to flow out of the tank into a leach field. The system and method includes for periodically regenerating the zeolite material in the zeolite tank, after the zeolite material has become substantially exhausted, and restoring the zeolite material in the zeolite tank for reuse. The system provides for removal of the displaced nitrogen contaminants generated from the regeneration of the zeolite material in the zeolite tank.Type: GrantFiled: January 26, 1998Date of Patent: June 27, 2000Inventor: Jane Anne Rose
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Patent number: 6071415Abstract: A process for the purification of water to render it fit for drinking. It is passed first through a halogenated resin and after this through activated carbon impregnated with silver, which contains a comparatively high silver content, of at least two percent by weight, and up to about 14 weight percent. A purification system for carrying out such process comprising a sequence of a layer of halogenated resin followed by activated carbon impregnated with at least two weight percent silver. The impregnated silver absorbs efficiently a high percentage of bromide/bromine, iodide/iodine or mixtures of these.Type: GrantFiled: November 28, 1995Date of Patent: June 6, 2000Assignee: Purotech International Inc.Inventors: Moshe A Frommer, Israel Dalven
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Patent number: 6060525Abstract: A chromatographic composition for the selective binding of borate ion comprising support resin particle and polymers containing covalently bonded borate binding carbohydrates wherein said carbohydrates are a mono-, di- or polysaccharide of three to seven alcohol moieties per saccharide unit.Type: GrantFiled: March 1, 1996Date of Patent: May 9, 2000Assignee: Dionix CorporationInventors: Rosanne W. Slingsby, Christopher A. Pohl, Jacek J. Jagodzinski
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Patent number: 6059975Abstract: Disclosed herein are a class of anion exchange resins containing two different exchange sites with improved selectivity and sorptive capability for chemical species in solution, such as heptavalent technetium (as pertechnetate anion, TcO.sub.4.sup.-). The resins are prepared by first reacting haloalkylated crosslinked copolymer beads with a large tertiary amine in a solvent in which the resin beads can swell, followed by reaction with a second, smaller, tertiary amine to more fully complete the functionalization of the resin. The resins have enhanced selectivity, capacity, and exchange kinetics.Type: GrantFiled: September 2, 1997Date of Patent: May 9, 2000Assignee: Lockheed Martin Energy Research CorporationInventors: Spiro D. Alexandratos, Gilbert M. Brown, Peter V. Bonnesen, Bruce A. Moyer
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Patent number: 6059974Abstract: An improved water softening process is provided which also reduces anion content. A first stream of water is passed through an anion-exchange unit to remove undesirable anions and raise the pH. The first stream of water is then provided to reactor/clarifier water softening equipment, where it acts as a source of hydroxyl ions. Preferably a second stream of water which did not pass through an anion-exchange unit is also provided to the water softening equipment. The streams of water are combined and processed through the softening equipment, where hardness ions are precipitated out, yielding softened water with reduced anion content. The anion-exchange system utilized preferably has a counter-current continuous resin train and a counter-current continuous resin regeneration unit.Type: GrantFiled: June 18, 1998Date of Patent: May 9, 2000Assignee: Applied Specialties, Inc.Inventor: Clarence Scheurman, III
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Patent number: 6051140Abstract: A portable point of use water decontaminating unit adapted to receive a flow of water from a faucet or other water source and pass the water through a filtering and decontaminating system to deliver the water as a continuous flow to an outlet. There is a pressure regulator to deliver the water at a proper volumetric flow rate, a pre-disinfectant filter system to receive the water from the pressure regulator and a post disinfectant filter section to filter the disinfectant and contaminants from the water. There is a disinfectant section comprising a disinfectant injector, and an elongate residence tube extending in successive coils around the interior of the container to receive the water from the disinfectant injection means and accomplish disinfection as the water travels through the residence tube.Type: GrantFiled: December 4, 1997Date of Patent: April 18, 2000Inventor: Cliff Perry
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Patent number: 6042618Abstract: The present invention comprises a dry cleaning system and method, in which dry cleaning machinery is used in conjunction with a specific solvent which is derived from an organic/inorganic hybrid (organo silicone). In this class of organo silicones is a group known as cyclic siloxanes. The cyclic siloxanes present the basis for material composition of the solvent chemistry which allows this dry cleaning system to be highly effective. The cyclic-siloxane-based solvent allows the system to result in an environmentally friendly process which is, also, more effective in cleaning fabrics and the like than any known prior system. The siloxane composition is employed in a dry cleaning machine to carry out the method of the invention.Type: GrantFiled: May 3, 1999Date of Patent: March 28, 2000Assignee: GreenEarth Cleaning LLCInventors: Wolf-Dieter R. Berndt, John McLeod Griffiss, James E. Douglas
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Patent number: 6042731Abstract: A method for removing arsenic species from an aqueous medium with modified zeolite minerals comprising providing an aqueous medium containing arsenic species in the form of both arsenate and arsenite, contacting the aqueous medium with an iron (II) laden zeolite mineral so that arsenic in the form of at least one of arsenate and arsenite contained in the aqueous medium can be adsorbed onto the iron (II) laden zeolite mineral forming an arsenic adsorbed iron (II) laden zeolite mineral, and separating the arsenic adsorbed iron (II) laden zeolite mineral from the aqueous medium.Type: GrantFiled: January 30, 1998Date of Patent: March 28, 2000Assignee: The University of South FloridaInventor: Dagmar Bonnin
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Patent number: 6030537Abstract: Disclosed is a method for removing arsenic from aqueous systems containing arsenic which includes contacting said aqueous system with an adsorbent material comprising (i) activated bauxite and (ii) aluminum trihydrate, until the arsenic is substantially removed from said aqueous system. The adsorbent material is prepared by the steps including (i) mixing powders of activated bauxite and aluminum trihydrate in the presence of water to form granules; (ii) drying said granules; and (iii) calcining said dried granules.Type: GrantFiled: August 2, 1996Date of Patent: February 29, 2000Assignee: Engelhard CorporationInventors: Thomas J. Shaniuk, Robert V. Russo, Arthur F. Greene
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Patent number: 6017969Abstract: An ion-exchange resin stabilized against shrinkage, the resin being loaded with at least one amphiphilic ion in the absence of sodium cations.Also a process for removing iodide compounds from a liquid carboxylic acid and/or carboxylic acid anhydride obtained from the Group VIII noble metal catalysed, alkyl iodide co-catalysed carbonylation of alcohols and/or their reactive derivatives by contacting the liquid carboxylic acid and/or carboxylic acid anhydride with the ion-exchange resin stabilized against shrinkage as aforesaid, the ion-exchange resin being loaded with one or more of the metals silver, palladium or mercury.Type: GrantFiled: May 20, 1998Date of Patent: January 25, 2000Assignee: BP Chemicals LimitedInventors: Michael David Jones, Matthew David Lunn, Andrew David Poole, Adele Shenton
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Patent number: 6007724Abstract: For the removal of trace quantities of iodine-containing contaminants from corrosive liquid feed streams, an adsorbent with distinct advantages over prior-art materials is provided. The treatment method involves the use of a metal phthalocyanine compound where the metal selected from the group consisting of silver, mercury, copper, lead, thallium, palladium, or mixtures thereof. Such metals are known to be reactive with the iodine-containing contaminants in the feed stream. Furthermore, the metal phthalocyanine is deposited on a carrier material selected from the group consisting of an activated carbon, a phenolic polymer, and an inorganic refractory metal oxide. Such adsorbent materials have proven substantially insoluble even in corrosive liquid feed streams associated with the invention. Reactivation and regeneration techniques, which are generally incompatible with prior-art adsorbent materials, are also disclosed.Type: GrantFiled: December 21, 1998Date of Patent: December 28, 1999Assignee: UOP LLCInventors: Santi Kulprathipanja, Bipin V. Vora, Yan Li
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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: 5980753Abstract: The present invention provides a process for recovering a volatile acid charaterized by bringing a waste liquid containing the volatile acid into contact with an amine having a boiling point of at least 50.degree. C. to thereby cause the amine to tonically adsorb the acid from the waste liquid, and thereafter heating the amine to desorb the acid, and a process for treating waste water utilizing this process.Type: GrantFiled: November 16, 1995Date of Patent: November 9, 1999Assignee: Daikin Industries, Ltd.Inventors: Mitsushi Itano, Tatsuya Unemoto
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Patent number: 5976401Abstract: A method for treating phosphate-containing waste water comprising treating phosphate-containing waste water with a metal hydroxide complex as a phosphate adsorbent represented by the formula:M.sub.1-x.sup.2+ M.sub.x.sup.3+ (OH.sup.-).sub.2+x-y (A.sup.n-).sub.y/nwherein M.sup.2+ is at least one divalent metal ion selected from the group consisting of Mg.sup.2+, Ni.sup.2+, Zn.sup.2+, Fe.sup.2+, Ca.sup.2+ and Cu.sup.2+ ; M.sup.3+ is at least one divalent metal ion selected from the group consisting of Al.sup.3+ and Fe.sup.3+ ; A.sup.n- is an n-valent anion; x is in the range 0.1.ltoreq.x.ltoreq.0.5; y is in the range 0.1.ltoreq.y.ltoreq.0.5; and n is 1 or 2.Type: GrantFiled: August 6, 1997Date of Patent: November 2, 1999Assignee: Tomita Pharmaceutical Co., Ltd.Inventors: Takashi Suzuki, Toshio Sato, Akira Ookubo, Tomohide Koizumi, Mikiko Mihara, Shoichi Oonishi
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Patent number: 5976761Abstract: A process for producing a water insoluble, aqueous alkali soluble, film forming novolak resin having low metal ions, made by the fractionation of a phenol formaldehyde condensation product, a process for producing a resin a photoresist composition of superior quality containing such novolak resin, and a method for producing a semiconductor device using such photoresist composition.Type: GrantFiled: March 25, 1998Date of Patent: November 2, 1999Assignee: Clariant Finance (BVI) LimitedInventors: M. Dalil Rahman, Daniel P. Aubin, Dinesh N. Khanna, Sunit S. Dixit
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Patent number: 5954965Abstract: The present invention relates to a process for producing pure water having a total organic carbon content of not more than 200 ppb instantly after start of the operation of a high purity water system, comprising using as an ion exchange resin a specific strongly basic anion exchange resin and passing raw water through the high purity water system at a space velocity of not less than 20. The produced pure water is capable of producing tasteless and odorless pure water instantly after start of the operation of the high purity water system.Type: GrantFiled: March 26, 1997Date of Patent: September 21, 1999Assignee: Mitsubishi Chemical CorporationInventors: Hirohisa Kubota, Katsuhiko Yano, Junya Watanabe, Keiko Kudo
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Patent number: 5948265Abstract: An ion-exchanger is provided which comprises zirconium hydroxide supported on active carbon. The process for producing the ion-exchanger, and a process for removing a multiply charged anion are also provided which employ the ion-exchanger. The ion-exchanger of the present invention has high chemical resistance, high heat resistance, high mechanical strength, and excellent ion exchange characteristics.Type: GrantFiled: July 3, 1997Date of Patent: September 7, 1999Assignee: Tosoh CorporationInventors: Hidetoshi Wakamatsu, Manabu Sakurai, Tsugio Murakami, Sadakatsu Kumoi
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Patent number: 5936003Abstract: In accordance with the present invention, an improved anion-exchange chromatographic composition has been formed which comprises synthetic resin support particles and anion exchange compounds attached thereto, wherein the anion-exchange compounds comprise an internal reactive group, which may be an ester, ketone or amide group, and a terminal quaternary ammonium salt which functions as an anion-exchange site. The compositions of the present invention exhibit improved hydrolytic stability as compared to other known anion-exchange chromatographic compositions due to the presence of linkers which increase the number of atoms separating the internal reactive group from the nitrogen atom of the terminal ammonium anion-exchange site. Formed articles and methods employing the anion-exchange chromatographic composition are also provided.Type: GrantFiled: March 3, 1997Date of Patent: August 10, 1999Assignee: Dionex CorporationInventors: Christopher Pohl, Charanijit Saini, Jacek Jagodzinski
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Patent number: 5908557Abstract: A process for the separation of pentavalent arsenic from an aqueous solution using an N-alkyl pyridinium-containing adsorption medium is disclosed. An oxidizing medium and process for the oxidation of trivalent arsenic to pentavalent arsenic with removal of the pentavalent arsenic so formed is also disclosed.Type: GrantFiled: May 12, 1997Date of Patent: June 1, 1999Assignee: NTEC Solutions, Inc.Inventors: Paul K. Smith, Eugene P. Bergemann
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Patent number: 5895796Abstract: By using a polymer containing a dichloroethylene structure derived from a vinylidene chloride monomer in the molecule in place of an unsaturated polyester and an urethane resin, there can be obtained an excellent adsorbent which has improved workability in case of granulation and high strength, and causes little deterioration of its ion exchange capacity even after a large number of regenerations.Type: GrantFiled: August 14, 1997Date of Patent: April 20, 1999Assignee: Takeda Chemical Industries, Ltd.Inventors: Motoya Mouri, Toshio Kimura, Takeshi Ueda
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Patent number: 5876685Abstract: A method for the removal and purification of substantially all of the fluoride ions contained in a solution containing greater than 10 parts per million (ppm) fluoride ion, a mixture of other anions, silicon in the form of a fluorosilicic acid, silicic acid, silicates, or silicon tetrafluoride, and optionally also containing complex metal fluorides, to produce an ultrapure hydrofluoric acid, comprising the steps of (a) adjusting the pH of the solution to an alkaline pH to hydrolyze the fluorosilicic acid and any complex metal fluorides; (b) removing the fluoride ions and other anions from the solution by passing the solution through an ion exchange resin, where the ion exchange resin is adapted to adsorb substantially all of the fluoride passed over the ion exchange resin; (c) displacing the fluoride ions and other anions bound to the ion exchange resin, thereby forming a mixture of anions in an effluent emanating from resin; (d) optionally concentrating the effluent at a high pH and then lowering the pH; andType: GrantFiled: September 11, 1996Date of Patent: March 2, 1999Assignee: IPEC Clean, Inc.Inventors: Gerald A. Krulik, John A. Adams, Dieter Dornisch, David W. Persichini, Christopher S. Blatt
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Patent number: 5855789Abstract: A process for removing contaminating levels of selenium from a contaminated aqueous solution is disclosed. That process includes providing a vessel or flow-permissive container containing a water-insoluble polymeric adsorption medium having a plurality of polymerized C.sub.1 -C.sub.4 N-alkylated pyridinium-containing adsorption sites. An influent of an aqueous solution having a total selenium concentration of about 10 to about 1000 parts per billion is introduced to the vessel or flow-permissive container to contact the insoluble polymeric adsorption medium. The solution is maintained in contact with that insoluble adsorption medium for a time period sufficient for the medium to bind the selenium in the contacting solution. The resulting aqueous solution is discharged from the vessel as an effluent having a total selenium concentration whose ratio to the total selenium concentration of the influent is about zero to about 10.sup.-3.Type: GrantFiled: April 1, 1997Date of Patent: January 5, 1999Assignee: NTEC Solutions, Inc.Inventors: Paul K. Smith, Eugene P. Bergemann
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Patent number: 5853598Abstract: A process for treating waste water of flue gas desulfurization comprising successively adjusting the pH of the waste water to 5 or less, bringing the waste water into contact with a column packed with fine particles of iron, flocculating the waste water, removing formed flocs from the waste water by solid-liquid separation, and optionally, bringing the remaining waste water into contact with a resin for COD adsorption, successively. Hazardous substances, such as oxidative substances, peroxosulfuric acid, iodic acid, heavy metals such as copper and lead, and non-metallic substances such as selenium compounds and fluorites, can be removed simultaneously and efficiently from the waste water of flue gas desulfurization containing these hazardous substances by using the process which is a simplified waste water disposal system.Type: GrantFiled: February 28, 1997Date of Patent: December 29, 1998Assignee: Kurita Water Industries Ltd.Inventors: Tsutomu Ogoshi, Yohka Tsurumaru, Hisao Tsuboya, Tsukasa Watanabe, Masao Enami