Ion Exchange; Chelation Or Liquid/liquid Ion Extraction Patents (Class 423/DIG14)
  • Patent number: 6139767
    Abstract: A carboxylic acid polymer containing a carboxylic group and having at least one kind of bond selected from the group consisting of an amino bond, an ether bond, and a thioether bond in a side chain is prepared by polymerizing a monomer component containing a carboxylic acid monomer represented by General Formula (3): ##STR1## where Y.sub.4 is a hydrogen atom, an allyl group, or a --(CHR.sub.4).sub.c --W.sub.2 --(CHR.sub.5).sub.d --COOR.sub.6 group, each of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6, independent of the others, is either a hydrogen atom or an alkyl group of a carbon number from 1 to 6, each of W.sub.1 and W.sub.2, independent of the other, is either an --NH-- group, an --S-- group, or an --O-- group, and each of a, b, c, and d, independent of the others, is an integer from 0 to 6. The carboxylic acid polymer has a superior metal-scavenging ability (chelating ability) and can be suitably used, for example, as a chelating agent.
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: October 31, 2000
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Hiroshi Yamamoto, Yoshiaki Hirano, Hisakazu Shindo, Hirokazu Ito
  • Patent number: 6113804
    Abstract: A composition for use in extracting copper values from aqueous solutions of metal salts comprises one or more o-hydroxyaryloximes containing at least 5 aliphatic or alicyclic carbon atoms which are strong metal extractants which, in 0.2 molar solution in an aliphatic hydrocarbon solution when loaded with 50% of the theoretical uptake of copper, will be in equilibrium with a 0.1 molar solution of copper as copper perchlorate at a pH less than 1 and one or more branched chain aliphatic or aliphatic-aromatic esters containing 10 to 30 carbon atoms, wherein the ratio of the number of methyl carbon atoms to the number of non-methyl carbon atoms is higher 1:5 and the weight ratio of A to B being in the range of 10:1 to 1:3.
    Type: Grant
    Filed: November 3, 1993
    Date of Patent: September 5, 2000
    Assignee: Imperial Chemical Industries PLC
    Inventors: Raymond Frederick Dalton, John Lindley Leng
  • Patent number: 6045763
    Abstract: The invention relates to a process for working up charged aqueous solutions, more especially etching solutions, which contain ammonia, at least one ammonium salt and metal ions in dissolved form and which accumulate in the treatment of substrates containing valuable metals, more especially copper-containing electronic sub-assemblies by contacting the aqueous solution with an organic water-immiscible extractant in one or more extraction stages to form an organic phase containing valuable metals and an aqueous phase, (b) washing the organic phase with a water-containing liquid in one or more successive washing stages wherein the water-containing liquid has a pH above 6.5 in the first washing stage and after said washing stage contacting the washing water before reuse with an organic extraction solution, and (c) conducting one or more stripping stages to transfer the valuable metals from the organic phase to an aqueous phase.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: April 4, 2000
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Ralf Kehl, Werner Schwab
  • Patent number: 5993757
    Abstract: A process for purifying a degraded oxime metal extractant organic phase from a metal extraction circuit wherein a degraded oxime metal extractant organic phase comprised of an oxime metal extractant, and aldehyde or ketone degradates in a water immiscible hydrocarbon solvent is reoximated thereby restoring the oxime extractant organic phase for further extraction in the metal extraction circuit. Optionally the degraded organic phase may be purified by distillation prior to reoximation. The distillation is carried out in a wiped film evaporator at temperatures above 180.degree. C. up to about 250.degree. C. at a pressure from about 0.5 mm Hg or lower up to about 10 mm Hg and the reoximation is carried out with hydroxylamine in the presence of a weak organic carboxylic acid as a phase transfer catalyst and in the presence of an alkali metal or alkaline earth metal hydroxide or carbonate, preferably sodium carbonate.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: November 30, 1999
    Assignee: Henkel Corporation
    Inventors: Michael J. Virnig, Leroy Krbechek, Mary Casey
  • Patent number: 5980787
    Abstract: A protective element for an electrochemical accumulator is made of granular varistor material, the mean diameter of the grains of the varistor material being less than 1 .mu.m, in particular less than 250 nm and, for more than 60% of the grains of the varistor material, the grain size deviating by at most 40% from its statistical average. For the preparation of such grains, a dispersion is made up to form biochemical hollow bodies which have an internal diameter in accordance with the above requirements. The dispersion is admixed with salts which dissolve in the dispersion with the formation of intermediate ions of a substance forming an intermediate for a varistor material, the intermediate ion of a substance forming an intermediate for a varistor material being an intermediate ion of an element required for the varistor material or of a corresponding compound.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: November 9, 1999
    Assignee: DaimlerChrysler AG
    Inventors: Martha Maly-Schreiber, Arnold van Zyl, Josef Ritter, Reinhold Hilpert
  • Patent number: 5976401
    Abstract: 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: Grant
    Filed: August 6, 1997
    Date of Patent: November 2, 1999
    Assignee: Tomita Pharmaceutical Co., Ltd.
    Inventors: Takashi Suzuki, Toshio Sato, Akira Ookubo, Tomohide Koizumi, Mikiko Mihara, Shoichi Oonishi
  • Patent number: 5916359
    Abstract: A solvent composition useful for liquid delivery chemical vapor deposition of organometallic precursors such as .beta.-diketonate metal precursors. The solvent composition comprises a mixture of solvent species A, B and C in the proportion A:B:C wherein A is from about 3 to about 7 parts by volume, B is from about 2 to about 6 parts by volume, and C is from 0 to about 3 parts by volume, wherein A is a C.sub.6 -C.sub.8 alkane, B is a C.sub.8 -C.sub.12 alkane, and C is a glyme-based solvent (glyme, diglyme, tetraglyme, etc.) or a polyamine. The particular solvent composition including octane, decane and polyamine in an approximate 5:4:1 weight ratio is particularly usefully employed in the formation of SrBi.sub.2 Ta.sub.2 O.sub.9 films.
    Type: Grant
    Filed: November 20, 1997
    Date of Patent: June 29, 1999
    Assignee: Advanced Technology Materials, Inc.
    Inventors: Thomas H. Baum, Gautam Bhandari
  • Patent number: 5863439
    Abstract: A process for preconcentrating and separating radium from a contaminated solution containing at least water and radium includes the steps of adding a quantity of a water-soluble macrocyclic polyether to the contaminated solution to form a combined solution. An acid is added to the combined solution to form an acidic combined solution having an ?H.sup.+ ! concentration of about 0.5M. The acidic combined solution is contacted with a sulfonic acid-based strong acid cation exchange medium or a organophilic sulfonic acid medium having a plurality of binding sites thereon to bind the radium thereto and to form a radium-depleted solution. The radium-depleted solution is separated from the strong acid cation exchange medium or organophilic sulfonic acid medium. The radium remaining bound to the exchange medium or organophilic reagent is then stripped from the exchange medium or organophilic medium and the activity of the radium is measured.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: January 26, 1999
    Assignee: Arch Development Corporation
    Inventors: Mark Dietz, E. Philip Horwitz, Renato Chiarizia, Richard A. Bartsch
  • Patent number: 5849258
    Abstract: The invention relates to a synthetic crystalline material and its use in catalytic conversion of organic compounds and as a sorbent. The crystalline material contains one or more microporous crystalline phases, having a micropore volume greater than or equal to about 0.15 cc/g distributed in channels between about 3 to about 15 .ANG. in average diameter which is rendered accessible by a mesopore volume of greater than or equal to about 0.1 cc/g distributed in channels between about 20 to about 100 .ANG. in average diameter. A process is also provided for preparing the crystalline material of the present invention.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: December 15, 1998
    Assignee: Intevep, S.A.
    Inventors: Juan Lujano, Yilda Romero, Jose Carrazza
  • Patent number: 5820664
    Abstract: A metal source reagent liquid solution, comprising: (i) at least one metal coordination complex including a metal to which is coordinatively bound at least one ligand in a stable complex, wherein the ligand is selected from the group consisting of: .beta.-diketonates, .beta.-ketoiminates, .beta.-diiminates, C.sub.1 -C.sub.8 alkyl, C.sub.2 -C.sub.10 alkenyl, C.sub.2 -C.sub.15 cycloalkenyl, C.sub.6 -C.sub.10 aryl, C.sub.1 -C.sub.8 alkoxy, and fluorinated derivatives thereof; and (ii) a solvent for the metal coordination complex. The solutions are usefully employed for chemical vapor deposition of metals from the metal coordination complexes, such as Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Ti, Zr, Hf, Pr, V, Nb, Ta, Nd, Cr, W, Pm, Mn, Re, Sm, Fe, Ru, Eu, Co, Rh, Ir, Gd, Ni, Tb, Cu, Dy, Ho, Al, Tl, Er, Sn, Pb, Tm, Bi, and/or Yb. The solvent may comprise glyme solvents, alkanols, organic ethers, aliphatic hydrocarbons, and/or aromatic hydrocarbons.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: October 13, 1998
    Assignee: Advanced Technology Materials, Inc.
    Inventors: Robin A. Gardiner, Peter S. Kirlin, Thomas H. Baum, Douglas Gordon, Timothy E. Glassman, Sofia Pombrik, Brian A. Vaartstra
  • Patent number: 5792441
    Abstract: A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition, sulfuric acid is purified providing an opportunity for reuse in various mill applications, and/or concentrated and recycled to the generator. Alternatively, to avoid high evaporation costs, the purified acid can be used to regenerate a cation-exchange unit (CEU) used in the conversion of sodium chlorate to a sodium chlorate/chloric acid mixture which is fed to the generator in place of sodium chlorate and sulfuric acid. Using this approach, the sulfuric acid requirement of chlorine dioxide generators and, in turn, the amount of acidic generator effluent can be reduced.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: August 11, 1998
    Assignees: Pulp and Paper Research Institute of Canada, Eco-Tec Limited
    Inventors: Michael Paleologou, Rokhsareh Thompson, Craig J. Brown, Michael Sheedy
  • Patent number: 5758255
    Abstract: A method of reducing the entrainment of aqueous mineral acid solutions in organic extractants used in the solvent extraction of metals from the aqueous fluid is disclosed. The method comprises adding an effective, entrainment prevention amount of a water soluble cationic polymer having a molecular weight of from about 10,000 to about 500,000 to a metal rich aqueous mineral acid solution, immediately prior to, or during mixing with a metal poor organic extractant, and then recovering a metal poor aqueous mineral acid phase, and a metal rich organic extractant phase having a reduced level of entrainment of the aqueous mineral acid solution. In a preferred embodiment the metal is copper, and the polymer is poly(diallyldimethylammonium) chloride.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: May 26, 1998
    Assignee: Nalco Chemical Company
    Inventors: E. Michael Kerr, Kenneth M. Smith, II
  • Patent number: 5756063
    Abstract: Reagent grade hydrochloric acid having an iron content of less than 200 p.p.b. is made from an industrial organic isocyanate manufacturing process by removing hydrogen chloride from organic isocyanates produced in the reaction between phosgene and an organic amine, converting the hydrogen chloride to concentrated aqueous hydrochloric acid, and contacting the acid with a strongly basic anion exchange resin.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: May 26, 1998
    Assignee: BASF Corporation
    Inventors: K. Edward Nuernberg, Hans V. Schwarz
  • Patent number: 5750032
    Abstract: Process for removing an alkali metal compound from an acid solution also containing nickel and aluminum compounds, which requires contacting the acid solution first with an ion exchange resin functional to remove the nickel and aluminum compounds from the acid solution; and then contacting the acid solution with an ion exchange resin which is more selective to remove the alkali metal compound from the acid solution.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: May 12, 1998
    Assignee: Shell Oil Company
    Inventors: Zaida Diaz, John David Wilkey
  • Patent number: 5733361
    Abstract: In a first embodiment, the present invention concerns a colloidal dispersion of a cerium compound, characterised in that it has a CeO.sub.2 concentration of between 500 and 700 g/l and a conductivity of at most 50 mS/cm. In a second embodiment, the colloidal dispersion is characterised in that it has a CeO.sub.2 concentration of more than 700 g/l.A process for the preparation of the dispersion of the invention is characterised in that a starting suspension or dispersion is treated by dialysis or with a cationic resin and an anionic resin.Colloidal dispersions of the invention can be used in automobile post combustion catalysis, in cosmetics, in lubrication, in ceramics or as an anticorrosion agent.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: March 31, 1998
    Assignee: Rhone-Poulenc Chimie
    Inventors: Jean-Yves Chane-Ching, Thierry Chopin
  • Patent number: 5679281
    Abstract: Gelled material compositions for use as adsorbents and ion exchangers. The composition including a specific extractant, an organic solvent and a halopolymer modified by substitution with a radical of a substance compatible with the specific extractant. Optionally the composition may be in form of beads.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: October 21, 1997
    Assignees: Yeda Research and Development Co. Ltd., The Weizmann Institute of Science
    Inventors: Gideon Levin, Lev Bromberg
  • Patent number: 5670078
    Abstract: Low optical density magnetic fluid which is a stable dispersion of fine magnetic particles. A method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion capable of forming a magnetic phase, treating the loaded resin to form magnetic particles and micronizing the resin and magnetic particles in a fluid to form an aqueous stable colloid. The invention provides submicron particles and submicron particles which are dispersed in an aqueous colloid. A method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion, treating the loaded resin to form nanoscale particles. Fluidizing the resin and particles to form an aqueous stable colloid. A method of forming magnetic materials having tunable magnetic properties and the magnetic materials formed thereby.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 23, 1997
    Assignee: Xerox Corporation
    Inventor: Ronald F. Ziolo
  • Patent number: 5607594
    Abstract: In the process for purifying an aqueous MDEA-solution the formate content of the MDEA-solution circulated in a main stream between the absorber and desorber of a hydrogen sulfide wash unit for gas produced by gasification of a carbonaceous material, e.g. coal, is measured. A partial stream of MDEA-solution is withdrawn from the main stream, passed over an ion exchange medium which removes some formate present to form a partially purified partial stream and subsequently the purified partial stream is returned to the main stream. The amount of the withdrawal from the main stream is controlled so that the formate content of the main stream is maintained between 10 and 30 g/l. Only from 0.5 to 0.08% by volume need be withdrawn from the main stream to form the partial stream. The ion exchange medium can be regenerated with a hydroxide-containing solution, which is subsequently fed to an ammonia separator column of a hydrogen sulfide wash apparatus.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: March 4, 1997
    Assignee: Krupp Koppers GmbH
    Inventors: Werner Pohl, Johannes Menzel
  • Patent number: 5578245
    Abstract: The invention provides submicron particles. The invention further provides submicron particles which are dispersed in an aqueous colloid. The invention further provides a method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion, treating the loaded resin to form nanoscale particles. The invention further provides fluidizing the resin and particles to form an aqueous stable colloid.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: November 26, 1996
    Assignee: Xerox Corporation
    Inventor: Ronald F. Ziolo
  • Patent number: 5545309
    Abstract: The invention is a method of processing a waste liquid containing at least an organic quaternary ammonium hydroxide. The waste liquid is brought into contact with a cation-exchanging material so as to make the organic quaternary ammonium ions adsorbed by the material to thereby remove the ions from the liquid (adsorbing step), and optionally the cation-exchanged water obtained by the contact is again processed to separate and remove resist peelings and surfactants therefrom. The invention is also a method of processing the organic quaternary ammonium hydroxide-containing waste liquid for recovering a valuable substance of the organic quaternary ammonium hydroxide therefrom.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: August 13, 1996
    Assignee: Tama Chemicals Co., LTD.
    Inventors: Shumpei Shimizu, Toshitsura Cho, Shigeo Iiri
  • Patent number: 5525315
    Abstract: The invention is for a process of removal of dissolved heavy metal cation contaminants from an organic solution. The process of the invention involves providing a chelating ion exchange resin modified by removal of sodium ions therefrom and contacting said organic solution with said modified exchange resin for a time sufficient to remove ionic metal impurities. The invention is useful for removal of ionic contaminants from organic solutions requiring high purity.
    Type: Grant
    Filed: December 7, 1993
    Date of Patent: June 11, 1996
    Assignee: Shipley Company, L.L.C.
    Inventor: W. Andrew Burke
  • Patent number: 5520813
    Abstract: A process for separating monovalent ions from a sodium-bearing radioactive waste stream which comprises contacting the sodium-bearing radioactive waste stream against at least one ion exchange membrane having permselectivity for monovalent ions wherein the monovalent ions permeate or diffuse across the ion exchange membrane to form a permeate of a monovalent ion-enriched stream and wherein a retentate is formed from the sodium-bearing radioactive waste stream which is substantially depleted of monovalent ions.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: May 28, 1996
    Inventors: Amos Korin, Netta Korin
  • Patent number: 5500126
    Abstract: An improved process for removal of metal ions from aqueous solutions is disclosed. Removal of metal ions from aqueous solution, particularly from metal plating waste streams, is achieved by the combined use of polyamines, at levels less than the stoichiometric amount of metal ion, and cation exchangers. Treatment of waste streams with low levels of triethylenetetramine followed by contact with a strong acid cation exchange resin is especially effective in the removal of copper from metal-containing waste streams.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: March 19, 1996
    Assignee: Rohm and Haas Company
    Inventor: William Fries
  • Patent number: 5474593
    Abstract: An agent for treating metal ions in an aqueous solution, comprising a solid porous carrier and, supported thereon, an organic reagent (hereinafter referred to as a "redox reagent") which is capable of converting metal ions (inclusive of metal complex ions) contained in an aqueous solution to zero valent metal or monovalent metal ions by a redox reaction and which is capable of carrying out oxidation-reduction reversibly.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: December 12, 1995
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Tatsuya Sakurai, Hiroshi Fujimura, Koji Kusabe, Keishiro Hata
  • Patent number: 5468536
    Abstract: A microfibrous sorbent article is provided. The microfibrous sorbent article comprises an elongate boom having a substantially oval cross-section. The boom is formed of multiple adjacent microfibers layers, the layers being bonded to each other by entanglement of fibers between adjacent layers. The boom further contains ion exchange resin, selectively absorbent particulate material, catalytic agent or selectively reactive particulate material.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: November 21, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William C. Whitcomb, Thomas I. Insley, Simon S. Fung
  • Patent number: 5441712
    Abstract: A hydrometallurgical process for producing zinc oxide from an aqueous solution containing zinc ions is provided. The process comprises the steps of contacting a zinc solution with an insoluble organic solvent selective to the extraction of zinc and thereby produce a zinc-loaded organic solvent. The zinc is then stripped from the zinc-loaded organic solvent with a solution of nitric acid to form a solution of zinc nitrate. The zinc nitrate solution is subjected to thermal hydrolysis at an elevated temperature in the presence of pressurized water vapor, the temperature being at least sufficient to decompose the zinc nitrate to zinc oxide which is thereafter recovered.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: August 15, 1995
    Assignee: BHP Minerals International Inc.
    Inventors: Willem P. C. Duyvesteyn, Teun Bakker, Manuel R. Lastra
  • Patent number: 5424050
    Abstract: The invention also relates to a method of recovering the gallium contained in an aqueous solution of strongly alkaline sodium aluminate by chemical exchange between a stationary phase consisting of a microporous adsorbent resin impregnated with 7-(alkyl or alkenyl)-8-hydroxyquinoline and the aqueous phsae of sodium aluminate. According to the invention, the dry resin prior to its impregnation has a specific surface area measured by the BET method which is at least equal to 450 sq.m/g of resin, a pore volume at least equal to 1500 cu.mm/g of resin, a mean pore diameter comprised between 80 and 500 .ANG. with at least 80% of this volume consisting of pores with a diameter comprised between 40 and 5000 .ANG., a rate of expansion of swelling in an aqueous medium which does not exceed 20% and in that it is impregnated with 7-(alkyl or alkenyl)-8-hydroxyquinoline in the proportion of 250 to 350 g/liter of dry resin.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: June 13, 1995
    Assignee: Rhone-Poulenc Chimie
    Inventor: Jean-Michel Lamerant
  • Patent number: 5411573
    Abstract: The present invention is directed to a process for reducing the oxidation state of a metal by contacting an acidic solution of the metal with an electroactive polymer, and accumulating and recovering the metal. More particularly, the invention is directed to a method for recovering precious metals like gold, platinum, palladium, and gold-platinum alloys from acidic solution by contacting the solution with an electroactive polymer like polyaniline or polypyrrole.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: May 2, 1995
    Assignee: National University of Singapore
    Inventors: En-Tang Kang, Yen P. Ting, Koon G. Neoh, Kuang L. Tan
  • Patent number: 5389594
    Abstract: New compounds are represented by Formula I: ##STR1## and salts and complexes thereof; wherein R is an alkyl group having at least one --SO.sub.3 H and at least one --OH; each R' is independently selected from hydrogen, an unsubstituted or inertly substituted alkyl group, an alkyl group substituted with a carbonyl group, with a carboxylic acid, salt or complexed carboxyl group, or an alkoxy group; R" is hydroxyalkyl and x+y+z=3 and are good chelants. The compounds are also biodegradable and are particularly useful in washing compositions, preferably containing detergents and in gas conditioning.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: February 14, 1995
    Assignee: The Dow Chemical Company
    Inventors: Druce K. Crump, David A. Wilson
  • Patent number: 5368632
    Abstract: The treatment of solutions of metal ions with redox polymers under conditions to reduce the ions to a lower valence. The resulting solutions of the lower valence ions are separated from the polymers, and the polymers are regenerated for further use in such treatment. The method of the invention is employed to convert high valence, toxic metal ions to lower valence ions of reduced toxicity. Preferably, the electronically conductive polymer is mounted on a suitable support, and a solution of the toxic metal ion is brought into contact with the polymer. A variety of redox polymers, in particular, electronically conductive polymers, may be used in the practice of the invention, and individual such polymers may be structurally altered to suit particular metal ions. Polymers especially contemplated for use in the invention are polypyrroles, polyanilines and polythiophenes. All of these polymers are characterized as redox polymers with a positive charge on their backbones.
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: November 29, 1994
    Assignee: Board of Regents, The University of Texas System
    Inventors: Krishnan Rajeshwar, Chang Wei, Sanjay Basak
  • Patent number: 5362417
    Abstract: The invention provides submicron particles. The invention further provides submicron particles which are dispersed in an aqueous colloid. The invention further provides a method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion, treating the loaded resin to form nanoscale particles. The invention further provides fluidizing the resin and particles to form an aqueous stable colloid.
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: November 8, 1994
    Assignee: Xerox Corporation
    Inventor: Ronald E. Ziolo
  • Patent number: 5342901
    Abstract: The invention provides a film-formable, chelate-forming resin having, per 1000 g of the resin, about 0.2 to about 3.5 moles of chelate-forming group represented by the formula [1], [2], [3] or [4]: ##STR1## wherein R.sup.1 and R.sup.2 are the same or different and each represents a hydrogen atom, a halogen atom, a nitro group, a nitroso group, a cyano group, a hydrocarbon group having up to 18 carbon atoms, or an alkoxyalkyl group having up to 12 carbon atoms, and a process for preparing the resin.The invention also provides a metal surface treating composition and a corrosion preventive coating composition both containing the above chelate-forming resin, and a chelate-forming resin composition comprising the resin and a crosslinking agent.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: August 30, 1994
    Assignee: Kansai Paint Company, Limited
    Inventors: Hideo Kogure, Heihachi Murase, Masafumi Kume
  • Patent number: 5340585
    Abstract: Compositions and methods which are effective to treat benign gynecological disorders for extended periods of time in women in who the risk of endometrial stimulation is minimized or absent are described, wherein an effective amount of a gonadotropin hormone releasing hormone composition and an effective amount of an estrogenic composition are provided over a period of time, optionally with addition of an androgenic composition.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: August 23, 1994
    Assignee: University of Southern California
    Inventors: Malcolm C. Pike, Darcy V. Spicer
  • Patent number: 5300274
    Abstract: A method for preparing molybdenum and sulfur containing compounds of the general formula X.sub.2 Mo.sub.2 S.sub.12.yH.sub.2 O, where X is a cation selected from the group consisting of Na.sup.+, K.sup.+, R.sub.4 N.sup.+, R.sub.3 NH.sup.+, R.sub.2 NH.sub.2.sup.+, RNH.sub.3.sup.+, NH.sub.4.sup.+, R.sub.4 P.sup.+, R.sub.4 As.sup.+,(R.sub.3 P).sub.2 N.sup.+, R is a C.sub.1 -C.sub.30 alkyl, C.sub.6 -C.sub.30 aryl, C.sub.7 -C.sub.30 aralkyl or C.sub.2 -C.sub.30 alkoxyalkyl group and mixtures thereof, and y is from 0 to 2. The method comprises preparing a sulfide solution that contains from about 9 wt. % to about 13 wt. % sulfide sulfur; contacting the solution with elemental sulfur and a hydroxide; adding a molybdenum compound for a time and at a temperature sufficient to form a reaction mixture and a precipitate; separating the precipitate; and contacting the remaining reaction mixture with additional sulfide solution to form (NH.sub.4 ).sub.2 Mo.sub.2 S.sub.12.yH.sub.2 O.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: April 5, 1994
    Assignee: Exxon Research and Engineering Company
    Inventors: Liwen Wei, Catherine L. Coyle, Thomas R. Halbert, Edward I. Stiefel
  • Patent number: 5258524
    Abstract: A composition of bibenzimidazoles of the Formula (I): ##STR1## wherein X & Y which may be the same or different and, taken together, contain a total of from 12 to 52 saturated carbon atoms, are (a) each selected from --R, --COR, --CH.sub.2 COOR, --CH(COOR).sub.2 and --COOR; or (b) together form a group selected from ##STR2## wherein R is an optionally substituted hydrocarbyl group,A & B taken together with the two carbon atoms to which they are linked form an optionally substituted benzene ring; andC & D taken together with the two carbon atoms to which they are linked form an optionally substituted benzene ring;characterised in that at least 50% by weight of the bibenzimidazoles in the composition are of Formula (II) ##STR3## wherein X and Y are as hereinbefore defined;T, U, V & W which may be the same or different, are H, R.sup.1 or OR.sup.1 provided at least one of T, U, V & W is R.sup.1 or OR.sup.1 ;and R.sup.1 is C.sub.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: November 2, 1993
    Assignee: Imperial Chemical Industries PLC
    Inventors: Peter M. Quan, Derek Thorp, Raymond F. Dalton
  • Patent number: 5258167
    Abstract: An extractant for extracting rare earth metal ions comprises, for instance, di-(3-methylcyclohexyl)phosphoric acid, di-1-ethylpentylphosphoric acid, docosyl-(2 isopropyl-5-methylcyclohexyl) phosphoric acid, 2-ethylhexyl-2-methylcyclohexylphosphoric acid and/or 2-hexyloctyl-cyclohexylphosphoric acid or a combination of, for instance, dicyclohexylphosphoric acid and di-(2-heptylundecyl) phosphoric acid. A method for extracting rare earth metals comprises the step of bringing an acidic aqueous solution containing ions of rare earth metals into contact with an extraction medium containing an extractant exemplified above to transfer the rare earth metal ions to the extraction medium. The extractant not only exhibits high extractability for rare earth metal ions but also facilitates the back extraction of the rare earth metal ions therefrom.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: November 2, 1993
    Assignee: Lion Corporation
    Inventors: Toshio Takahashi, Hiroaki Nishizawa, Yukari Ishii
  • Patent number: 5221525
    Abstract: A process for extracting gallium from an aqueous gallium-bearing acidic solution comprises: a) providing a quantity of phosphorus within the aqueous gallium-bearing solution, the phosphorus being provided in an aqueous soluble form and being substantially dissolved within the aqueous solution, the aqueous gallium-bearing solution having dissolved phosphorus defining a first aqueous phase; b) intermixing the aqueous gallium-bearing solution having the quantity of aqueous soluble dissolved phosphorus with a first organic phase comprising a quantity of an alkylated 8-hydroxyquinoline; c) separating the intermixed first aqueous phase and first organic phases into a second aqueous phase and a second organic phase, the quantities of aqueous soluble phosphorus and alkylated 8-hydroxyquinoline being effective to extract gallium from the aqueous gallium-bearing solution to provide a gallium concentration in the second organic phase which is greater than a gallium concentration in the first organic phase and to provide
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: June 22, 1993
    Assignee: N. A. Degerstrom, Inc.
    Inventors: James A. Bradbury, Michael E. Coleman, Susan D. Roberts
  • Patent number: 5213777
    Abstract: Metal values (especially uranium values) are extracted from aqueous solutions of metal oxyions in the absence of halogen ion using an imidazole of defined formula. Especially preferred extractants are 1-alkyl imidazoles and benzimidazoles having from 7 to 25 carbon atoms in the alkyl group.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: May 25, 1993
    Assignee: Imperial Chemical Industries PLC
    Inventor: Raymond F. Dalton
  • Patent number: 5206000
    Abstract: A process for the recovery of rhodium from aqueous solutions of complexes thereof wherein the solutions are treated with oxygen in the presence of a water soluble salt of a carboxylic acid and, in a second stage, further treated with a hypochlorite, whereby oil soluble rhodium compounds are formed which can readily be separated from the aqueous solution.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: April 27, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Diekhaus, Harald Kappesser
  • Patent number: 5204074
    Abstract: Gallium values are recovered from basic aqueous solutions thereof, e.g., Bayer liquors, by (i) contacting such basic aqueous solution (A) with a medium (I) containing a gallium extractant, whereby the gallium values are transferred to the medium (I), (ii) contacting such gallium-enriched medium (I) with a basic aqueous solution (B) and back-extracting the gallium values into the basic aqueous solution (B), (iii) contacting such gallium-enriched basic aqueous solution (B) with a second medium (II) containing a gallium extractant, whereby the gallium values are transferred to the medium (II), and (iv) contacting such gallium-enriched medium (II) with an aqueous solution (C), which may be acidic or basic, and back-extracting the gallium values into the aqueous solution (C); such gallium-enriched aqueous solution (C) may, for example, be directly electrolyzed to produce gallium metal.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: April 20, 1993
    Assignee: Rhone-Poulenc Chimie
    Inventors: Yvette Pescher, Jean-Louis Sabot
  • Patent number: 5198021
    Abstract: An improved process for recovery of precious metals such as gold or silver using novel ion exchange resins having aryl guanidyl functionality from aryl guanidine compounds having a pKa at 25.degree. C. less than 13 and preferably less than 12. The resins have improved elution properties compared to known guanidine reagents using caustic eluant solutions, particularly improved eluant solutions such as a mixture of sodium hydroxide and sodium benzoate.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: March 30, 1993
    Assignee: Henkel Corporation
    Inventor: Michael J. Virnig
  • Patent number: 5182026
    Abstract: Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monomer. The copolymer beads are functionalized such that weak-base exchange moieties are substituted at haloalkylated sites which are most accessible to diffusion into the beads, while hydrophilic, strong-base exchange moieties are substituted at haloalkylated sites which are least accessible to diffusion. The resins have improved exchange kinetics due to shortened diffusion path lengths for the chemical species being separated and improved diffusion into the resin beads due to the hydrophilic, strong-base exchange moieties.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: January 26, 1993
    Assignee: The Dow Chemical Company
    Inventor: William C. Pike
  • Patent number: 5176843
    Abstract: A composition for use in extracting copper values from aqueous solutions of metal salts which comprises:A. one or more o-hydroxyaryloximes containing at least 5 aliphatic or alicyclic carbon atoms which are strong metal extractants which, in 0.2 molar solution in an aliphatic hydrocarbon solution when loaded with 50% of the theoretical uptake of copper, will be in equilibrium with a 0.1 molar solution of copper as copper perchlorate at a pH less than 1;B. one or more branched chain aliphatic or aromatic-aliphatic alcohol containing 14 to 30 carbon atoms or aliphatic or aliphatic-aromatic esters containing 10 to 30 carbon atoms in which the ratio of the number of methyl carbon atoms to the number of non-methyl carbon atoms is higher than 1:5 and which is selected from the group consisting of highly branched hexadecyl alcohol, highly branched isooctadecyl alcohol and a diester of 2,2,4-trimethyl -1,3-pentanediol; andC. one or more o-hydroxyarylketoximes which are weak metal extractants and which, in 0.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: January 5, 1993
    Assignee: Imperial Chemical Industries PLC
    Inventors: Raymond F. Dalton, John L. Leng
  • Patent number: 5162084
    Abstract: 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 s
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: November 10, 1992
    Assignee: Conoco Inc.
    Inventors: Arthur L. Cummings, Fred C. Veatch, Alfred E. Keller, James C. Thompsen, Regina A. Severson
  • Patent number: 5156825
    Abstract: Method and apparatus (10) includes the use of multiple containers (B-1-B-3) containing a weak base ion resin (R) through which plating rinse water (W) is pumped with precious metal such as potassium gold cyanide adsorbed by said resin and then with the cyanide sequentially eluted by potassium hydroxide, water, potassium thiocyanate, water, and the resulting effluent evaporated (at 40) and then chilled (at 44) to remove for reuse the gold and inorganic salt and base.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: October 20, 1992
    Assignee: AMP Incorporated
    Inventors: Srinivasan V. Sarma, Douglas M. Streed
  • Patent number: 5141966
    Abstract: The invention concerns a polymer product for immobilizing of metal ions, adsorption, and the like, with the structureP--X--A--Qwherein P is a hydrophilic polymer with a molecular weight of more than 3 000 Daltons. X is a heteroatom, O, S or N, A is an atom sequence with at least 3 carbon atoms, and Q is a group with at least two branches with terminal, metal, metal chelate forming substituents, each having at least two hetero atoms, N, O or S, separated by two or at most three carbon atoms in a sequence or Q is a macrocyclic ring with at least 8 and not more than 30 atoms, at least 3 of which are nitrogen atoms, in sequence in the ring, and the preparation thereof which is done by activating a hydrophilic polymer with epoxi or vinylsulfone or inserting of aldehyde groups, couupling with tris-(2-aminoethyl)-amin and treating with reagents chosen from .alpha.-haloalkanoate, .alpha.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: August 25, 1992
    Assignee: Exploaterings AB T.B.F.
    Inventor: Jerker Porath
  • Patent number: 5141965
    Abstract: Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monomer. The copolymer beads are functionalized such that weak-base exchange moieties are substituted at haloalkylated sites which are most accessible to diffusion into the beads, while hydrophilic, strong-base exchange moieties are substituted at haloalkylated sites which are least accessible to diffusion. The resins have improved exchange kinetics due to shortened diffusion path lengths for the chemical species being separated and improved diffusion into the resin beads due to the hydrophilic, strong-base exchange moieties.
    Type: Grant
    Filed: January 14, 1992
    Date of Patent: August 25, 1992
    Assignee: The Dow Chemical Company
    Inventor: William C. Pike
  • Patent number: 5131943
    Abstract: A mixture of cyanide complexes with certain Group VIII metals and other metals is passed in contact with solid subdivided cross-linked polyvinylpyrrolidone whereby the Group VIII metals--platinum, palladium, rhodium and iridium--are preferentially retained on the cross-linked polyvinylpyrrolidone. The retained metals are recovered by ashing or chemical treatment of the cross-linked polyvinylpyrrolidone.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: July 21, 1992
    Assignee: Conoco Inc.
    Inventors: Joe D. Allison, James C. Thompsen
  • Patent number: 5122241
    Abstract: A process of hydrometallurgical treatment of a solution of materials containing gallium and at least one metalloid from Group V of the periodic table of the elements which comprises adding hydrochloric acid and an alkali metal chloride or an alkaline earth metal chloride to said solution to form gallium chloride so that the concentration of chloride ions, not counting those bonded to gallium, is in a range of from 4 to 10 N and the acidity of said solution is in a range of from 1 to about 5 N. Then placing the adjusted solution in contact with an organic phase comprising at least one neutral pentavalent phosphorus compound having a phosphorus-oxygen double bond, wherein the gallium chloride is extracted by the organic phase and reextracting the gallium from the organic phase.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: June 16, 1992
    Assignee: Metaleurop S.A.
    Inventor: Yves Le Quesne
  • Patent number: 5118478
    Abstract: The purpose of the process is to remove and to recover metals from their aqueous solution by the extraction process. As extractant is used monoesters of phosponic acid wherein the alkyl group is a phenyl-vinyl group or straight-chained and the ester group is straight-chained. The particular advantage of the process is that the metals can be removed from aqueous solutions to be treated without neutralization of the acid quantity produced during extraction, and this acid solution produced can be circulated e.g. to the stage before the extraction. The process can be used to the removing of metals from the industrial waste waters.
    Type: Grant
    Filed: August 29, 1988
    Date of Patent: June 2, 1992
    Assignee: Outokumpu Oy
    Inventors: Bror G. Nyman, Leif E. I. Hummelstedt