With Extraction Patents (Class 23/297)
  • Patent number: 10519558
    Abstract: Copper sulfate which includes a Fe with a concentration of 0.08 ppm by mass or less.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: December 31, 2019
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Tomota Nagaura, Masafumi Ishii
  • Patent number: 10150677
    Abstract: A method for increasing the evaporation rate of an evaporative pond containing pond liquor comprising water and at least 1% by weight of sodium carbonate, said evaporative pond being in contact with an ambient air at an ambient air temperature of more than 0° C., the method comprising the following steps: feeding part of the pond liquor to a heat exchanger; heating the pond liquor in the heat exchanger with heat and producing a heated pond liquor; feeding the heated pond liquor into a spraying device at an operating temperature of at least 10° C. above the ambient air temperature; and spraying the heated pond liquor into an open area of the evaporative pond with the spraying device, so as to evaporate at least part of the water of the pond liquor when sprayed.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: December 11, 2018
    Assignee: Solvay SA
    Inventors: Alain Vandendoren, Jessica A. Mote
  • Patent number: 9682370
    Abstract: Provided is a process for producing a fluorinated copolymer which is capable of providing an ion exchange membrane which can suppress a decrease in current efficiency by impurities in an aqueous alkali chloride solution as a raw material on electrolysis of the alkali chloride aqueous solution. Also provided is a process for producing a fluorinated copolymer that comprises washing a fluorinated copolymer comprising a fluorinated monomer having a carboxylic acid type functional group and a fluorinated olefin, with a washing solvent containing a fluorinated solvent at a temperature of at least 40° C. and at most a boiling point of the washing solvent.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: June 20, 2017
    Assignee: Asahi Glass Company, Limited
    Inventors: Shintaro Fukunaga, Yukiko Hattori, Kazuo Umemura, Shigeru Aida, Atsushi Tsuji, Toshinori Tomita
  • Patent number: 9604180
    Abstract: To provide a fluorinated copolymer which is capable of providing an ion exchange membrane having little adverse effect due to impurities in an alkali chloride aqueous solution on electrolysis of the alkali chloride aqueous solution. To use a fluorinated copolymer of a fluorinated monomer having a carboxylic acid type functional group with a fluorinated olefin, wherein the proportion of components having a common logarithm (log M) of a molecular weight M being from 2.0 to 3.5 is at most 10 mass % per 100 mass % of components having a common logarithm (log M) of a molecular weight M being at least 2.0, contained in a CClF2CF2CClFH soluble content.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: March 28, 2017
    Assignee: Asahi Glass Company, Limited
    Inventors: Yukiko Hattori, Shintaro Fukunaga, Kazuo Umemura, Shigeru Aida, Atsushi Tsuji, Toshinori Tomita
  • Patent number: 9327281
    Abstract: Tetrahedral [MoO4]2? readily binds CO2 to produce a robust [MoO3(?2-CO3)]2? that can affect the reduction of CO2 to formate.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: May 3, 2016
    Assignee: Massachusetts Institute of Technology
    Inventors: Ioana Aron, Christopher C. Cummins
  • Patent number: 8906117
    Abstract: Process for the combined regeneration of at least two soluble salts contained in a residue of an industrial process comprising heavy metals, comprising: adding an amount of reactive aqueous solution needed to completely dissolve the salts which are desired to be regenerated to the residue; subjecting the resulting aqueous suspension to a separation to obtain an aqueous production solution on the one hand and insoluble impurities on the other hand, which are removed; successively subjected the aqueous production solution to at least two selective crystallization steps intended to crystallize, separately, the at least two soluble salts which are desired to be regenerated, which are washed, dried and regenerated separately; and adjusting the concentration of at least one of the soluble salts to be regenerated in the aqueous production solution, at the moment when such solution is subjected to the step of crystallization of this salt, to give rise to the selective crystallization of this salt, by addition of a co
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: December 9, 2014
    Assignee: Solvay SA
    Inventors: Jean-Marie Blondel, Pierluigi Cassaghi, Cedric Humblot
  • Patent number: 8431107
    Abstract: A method for preparing ammonium heptamolybdate with the steps of: i) adding a molybdenum-containing organic phase to a liquid-liquid reextraction apparatus or to a desorption apparatus, and ii) directly cold-crystallization ammonium heptamolybdate by cooling the resulting reextraction or desorption solution.
    Type: Grant
    Filed: January 29, 2008
    Date of Patent: April 30, 2013
    Assignee: H.C. Starck GmbH
    Inventors: Viktor Stoller, Michael Erb, Juliane Meese-Marktscheffel, Benno Decker
  • Patent number: 8425626
    Abstract: A method of processing residual molasses from a procedure for the production of lactose from whey permeate. From this molasses, a mineral diminished component is extracted, concentrated, crystallized and therefrom a crystallized phase is separated.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: April 23, 2013
    Assignee: Molkerei Alois Muller GmbH & Co. KG
    Inventors: Roland Cloidt, Hanno Lehmann
  • Patent number: 8158098
    Abstract: Provided herein are processes for obtaining sylvinite and/or sylvite from sea water, sea bitterns and/or sea salts. The processes comprise reacting sea water, sea bitterns and/or sea salts with calcium hydroxide and/or calcium oxide.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: April 17, 2012
    Assignee: Exportadora de Sal, S.A. de C.V.
    Inventor: Abraham Sadan
  • Patent number: 7807119
    Abstract: A process for the production of alumina trihydrate by alkaline digestion of bauxite using the Bayer process in which aluminate liquor and insoluble residues are separated using a solid/liquid separation device (E; W2; DC) characterised in that the said slurry (21a; 41; 230?) is at least partially passed through a hydrocyclone (H1; H21; H22; H3) to improve and accelerate the separation of the sodium aluminate liquor from the insoluble residues in the slurry (21a; 41; 230?) containing the said liquor and the said residues and that supplies or is derived from the said liquid-solid separation device. In a first embodiment, at least one hydrocyclone is used at the upstream side of the settler-thickener, as clarifier of the pregnant liquor. In a second embodiment, at least one hydrocyclone is used as a thickener of insoluble residue mud. In a third embodiment, a hydrocyclone is used in combination with the causticisation settler.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: October 5, 2010
    Assignee: Aluminium Pechiney
    Inventors: Jean-Marc Rousseaux, Gerard Pignol, Yves Magnan
  • Patent number: 7740775
    Abstract: A process for preparing particles of a substance comprising contacting a first formulation including a first substance with a first solvent stream and a second solvent stream, thereby causing formation of particles of the first substance, wherein both the first and second solvent streams are in a non-supercritical state, and subjecting the resultant mixture to a separation process which causes separation of the first substance from the first and second solvent streams.
    Type: Grant
    Filed: November 7, 2002
    Date of Patent: June 22, 2010
    Assignee: Glaxo Group Limited
    Inventors: Mazin Nicola, Neale Gray
  • Patent number: 7695527
    Abstract: Provided are high purity copper sulfate wherein the content of Ag impurities is 1 wtppm or less, and having a purity of 99.99 wt % or higher, and a manufacturing method of high purity copper sulfate including the steps of dissolving crude copper sulfate crystals or copper metal, and subjecting this to active carbon treatment or solvent extraction and active carbon treatment in order to realize recrystallization. The present invention aims to provide a manufacturing method of high purity copper sulfate capable of efficiently removing impurities at a low cost by dissolving commercially available copper sulfate crystals in purified water or acid and thereafter subjecting this to the refining process, and high purity copper sulfate obtained thereby.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: April 13, 2010
    Assignee: Nippon Mining & Metals Co., Ltd
    Inventors: Yuichiro Shindo, Kouichi Takemoto
  • Patent number: 7611208
    Abstract: Disclosed are methods for solution mining of evaporite minerals, such as trona, comprising drilling an access well and at least two lateral boreholes; injecting a fluid; circulating the fluid through the lateral boreholes with a controlled fluid flow; and collecting a pregnant solution. Also disclosed are methods of solution mining that include injecting an aqueous solution into an underground trona cavity at a temperature sufficient to maintain at least a portion of the solution in the cavity in the Wegscheiderite solid phase region; removing aqueous solution from the cavity; and recovering alkaline values from the removed aqueous solution. Also disclosed are methods of solution mining that include injecting an aqueous solution into an underground trona cavity; removing aqueous solution from the cavity, wherein the temperature of the removed aqueous solution is at about the TWA point temperature; and recovering alkaline values from the removed aqueous solution.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: November 3, 2009
    Assignee: Sesqui Mining, LLC
    Inventors: Roger L. Day, James A. Herickhoff
  • Patent number: 7527773
    Abstract: A method of forming rare earth oxide nanocrystals include the steps of dissolving a rare earth including compound in a solution containing at least one organic solvent, heating the solution to a temperature of at least 160° C., wherein a concentration of the rare earth including compound provided upon decomposition is sufficient to provide critical supersaturation of at least one active intermediate in the solution to nucleate a plurality of rare earth oxide nanocrystals. The plurality of rare earth nanocrystals are then grown, wherein the growing step proceeds at least in part in the absence of critical supersaturation of the active intermediate. The rare earth nanocrystals can assemble into at least one close-packed, ordered nanocrystal superlattice.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: May 5, 2009
    Assignee: University of Florida Research Foundation, Inc.
    Inventor: Yunwei Charles Cao
  • Patent number: 7507388
    Abstract: A process related to sodium chemicals production, including the processing of bicarbonate containing solutions obtained by solution mining of trona, nahcolite or wegscheiderite reserves and the lake waters containing bicarbonates, includes the steps of purification, evaporation-decarbonation, crystallization, centrifuging, and drying.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: March 24, 2009
    Assignee: Eti Soda Uretim Pazarlama Nakliyat VE Elektrik Uretim Sanayi VE Ticaret A.S.
    Inventors: Ismail Ceylan, Ali Ugurelli, Noyan Dilek
  • Patent number: 7404828
    Abstract: A method of preparing particles of a substance, for example selected from a flavor, fragrance, pigment, dye, biologically active compound or a plastics material, comprises contacting the substance of a formulation (which may include the substance in conjunction with a second solvent) with a first solvent which comprises a C1-C4 hydrofluorocarbon, especially tetrafluoroethane, and subjecting the resultant mixture to a separation process, for example, by allowing the mixture to be sprayed as a mist (14) from a high pressure environment in a first vessel (2) to a low pressure environment in a second vessel (8), thereby to cause separation of a least some of the substance from the first solvent and the formation of fine particles (20) of the substance.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: July 29, 2008
    Assignee: Glaxo Group Limited
    Inventor: Mazin Nicola
  • Patent number: 7001526
    Abstract: Methods for separation of two optical isomers in a racemate into its constituent isomers by statistical means are described, whereby the saturated racemate solution is first allotted into small samples by means of microfluidic or inkjet techniques to obtain small sample quantities (picoliters to microliters) with one isomer in measurable excess of the other. The samples are then tested by means of spectrophotometers used for measuring Cotton Effects or Circular Dichroism or other related effects which measure the difference in the absorption of right and left circularly polarized light, so that there is a predetermined minimum excess of one enantiomer. Collecting them in three different receptacles then separates the three types of samples. The right and left excess samples are then used in the crystallization process to obtain right or left handed isomers respectively.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: February 21, 2006
    Inventor: Hla Ngwe Tin
  • Patent number: 6855176
    Abstract: A method for purifying substances through emulsion crystallisation is described, whereby (a) an emulsion of organic liquid droplets in a continuous water phase containing the impure substance is formed; (b) the emulsion is super-saturated in the substance; (c) crystallisation of the substance in the water phase is induced; (d) the crystals of the substance are isolated from the from emulsion, yielding an emulsion-filtrate; (e) additional impure substance is dissolved in the emulsion-filtrate; and (f) steps (b)-(d) are repeated with the emulsion obtained from step (e).
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: February 15, 2005
    Assignee: Reuter Chemische Apparatebau KG [DE/DE]
    Inventor: Karl Reuter
  • Publication number: 20020023318
    Abstract: Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it, comprising the following operations:
    Type: Application
    Filed: May 9, 2001
    Publication date: February 28, 2002
    Applicant: ENICHEM S.p.A.
    Inventors: Renzo Bignazzi, Gianni Pandolfi
  • Patent number: 6346523
    Abstract: The invention provides finely divided, substantially crystalline particles of budesonide characterized in that they are substantially smooth and having a BET value from 1 to 4.5 m2/g, process for their preparation, a pharmaceutical composition comprising said particles, the use of said particles in the treatment of and in the manufacture of a medicament for use in the treatment of a respiratory disorder, and a method of treatment of respiratory disorders by administration of said particles to a host in need of such treatment.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: February 12, 2002
    Assignee: AstraZeneca AB
    Inventors: Mikael Bisrat, Saeed Moshashaee
  • Patent number: 5840085
    Abstract: This invention relates to a process for removing sodium chloride and potassium salts, which are impurities concentrated and accumulated in pulp digesting chemicals, from ash collected from a soda recovery boiler. This process comprises the steps of (a) mixing ash collected from the combustion exhaust gas of the soda recovery boiler with water to form a slurry, adjusting the pH of the slurry to 10 or less by the addition of sulfuric acid, adjusting the temperature of the slurry to 20.degree. C. or above, and holding the slurry at that temperature for a sufficient time to cause sodium chloride and potassium salts present in the collected ash to be dissolved in the water; (b) cooling the slurry to a temperature below 20.degree. C. by the addition of ice and/or water so as to precipitate solid matter therefrom; and (c) separating the slurry into solid and liquid components and recovering the solid component while discharging the liquid component out of the system.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: November 24, 1998
    Assignee: Mitsubishi Jukogyo Kabushiki Kaisha
    Inventors: Kikuo Tokunaga, Masakazu Tateishi, Michimasa Yagi, Takayuki Maeda, Yoshihisa Arakawa
  • Patent number: 5503641
    Abstract: A potassium chloride mixture with grains of different sizes is extracted in a first stage with an unsaturated solution at an elevated temperature, whereby the finest grains are completely dissolved and the coarse proportions are caused to start dissolution, the purified medium fraction is transported into a second process stage and the previously dissolved amount of KCl is crystallized there onto the purified grains at a lower temperature, forming a product of high purity with a balanced grain size and a narrow grain spectrum.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: April 2, 1996
    Assignee: Kali und Salz Beteiligungs AG
    Inventors: Ivan Bakardjiev, Hans W. Beher, Ingo Stahl
  • Patent number: 5104478
    Abstract: A method for making single crystals, comprising osmotically removing the solvent from a solution containing the material to be grown into a crystal.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: April 14, 1992
    Assignee: The United States of America as represented by the Secretary of Commerce
    Inventors: Subhas K. Sikdar, Dena L. Lund
  • Patent number: 5028302
    Abstract: This invention relates to methods and systems for purifying brine for electrolysis in chlor-alkali cells, especially membrane cells by reducing the sulfate ion concentration, while at the same time minimizing the concentration of other undesireable ions such as calcium and chlorate. The methods and systems employed are unique combinations of refrigeration and crystallization, and brine recirculation techniques in the systems for electrolyzing brine.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: July 2, 1991
    Assignee: Texas Brine Corporation
    Inventors: John Rutherford, Raymond W. Ver Hove Hoeue
  • Patent number: 4997637
    Abstract: Disclosed is a method of reducing the sodium chloride content of potassium chloride by forming an aqueous slurry of potassium chloride feed crystals having a wide particle size distribution with an average diameter of about 0.1 to about 50 microns in a liquor saturated with potassium chloride and undersaturated with sodium chloride, which is at least 50% saturated with sodium chloride, whereby the smaller of the feed crystals dissolve and potassium chloride grows on the larger of the feed crystals to form product crystals removing the product crystals from the slurry. Also disclosed is an apparatus for carrying out this process.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: March 5, 1991
    Assignee: Occidental Chemical Corporation
    Inventor: Lewis E. Tufts
  • Patent number: 4822585
    Abstract: A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material in a solvent metal comprising copper or copper-aluminum combination and extracting heat therefrom to provide a solid phase containing silicon in crystal form and to concentrate impurities in a molten phase. After a desired amount of heat has been extracted, a substantial part of the molten phase is separated from the solid phase. A fraction or portion of the solid phase is remelted for purposes of removing solvent metal comprising copper or copper-aluminum solvent metal, including impurities, from the crystals, and at least one fraction of the remelted material is separated from the crystals.
    Type: Grant
    Filed: May 5, 1982
    Date of Patent: April 18, 1989
    Assignee: Aluminum Company of America
    Inventor: Robert K. Dawless
  • Patent number: 4734102
    Abstract: An apparatus for concentrating a suspension consisting of a hollow cylinder in which one or more tubes of a constant outward diameter extend in axial direction, in the wall of each tube at least one filter being mounted forming the only direct connection between the interior of the tube and the interior of the cylinder. Two or more of such apparatus can be connected in series in order to form a cascade.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: March 29, 1988
    Assignee: Nederlandse Centrale Organisatie Voor Toegepast Naturuwetenschappelijk Onderzoek
    Inventors: Henricus A. C. Thijssen, Gerardus J. Arkenbout
  • Patent number: 4683034
    Abstract: The invention relates to a process for separating dimethyl isophthalate (DMI) and dimethyl orthophthalate (DMO) and other by-products from their mixture with dimethyl terephthalate (DMT), formed in the oxidation of p-xylene followed by esterification with methanol, by crystallization from the melt.Initially, the esterification product is here distilled once or several times. The DMT-rich fraction obtained is then subjected wholly or partially to one or several crystallizations from the melt, and the DMI-DMO fraction thus obtained is at least partially removed from the system. As an alternative, the DMT-rich fraction is first recrystallized from methanol, the methanol is then evaporated from the mother liquor and the remaining residue is subjected to one or several crystallizations from the melt. The DMI-DMO fraction thus obtained is again at least partially removed from the system.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: July 28, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rolf Bader, Hartmut Last, Manfred Mayer, Siegbert Rittner, Edgar Wetzel
  • Patent number: 4657559
    Abstract: The present invention relates to the processing of phosphoric acid by crystallization starting with phosphoric acid and adding relatively large amounts of fine, relatively pure seed crystals to acid which has been cooled to supersaturated conditions. Crystallization thereafter proceeds under conditions which substantially favor growth on the seeds which are added and disfavor secondary nucleation. The present invention particularly describes a seed crystal generator for use in the foregoing process in which relatively high purity phosphoric acid, containing 60% to 66% P.sub.2 O.sub.5 is cooled to a temperature of at least 5.degree. to 10.degree. C. below zero and thereafter nucleated under agitation for less than ten minutes in a small crystallizing vessel.
    Type: Grant
    Filed: May 8, 1985
    Date of Patent: April 14, 1987
    Assignee: Freeport Research and Engineering Company
    Inventors: Phillip D. Mollere, Vivian C. Astley, Jody J. Taravella
  • Patent number: 4655789
    Abstract: The present invention discloses a new method for obtaining a crystallized phosphoric acid of relatively high purity starting with conventional phosphoric acid. The new method is based on crystallization of orthophosphoric acid hemihydrate from the phosphoric acid. Massive nucleation which would lead to the formation of unprocessable masses is avoided in the new method by providing unusually large amounts of fine relatively pure seed crystals of orthophosphoric acid hemihydrate and operating the crystallization process under conditions which favor crystal growth on the seed crystals and disfavor the occurrence of secondary nucleation. To prevent the crystallizing magma from reaching a viscosity which would render further processing difficult the present invention provides for recycling raffinate in an amount sufficient to maintain the solids content of the crystallizing magma below about 40%.
    Type: Grant
    Filed: May 8, 1985
    Date of Patent: April 7, 1987
    Assignee: Freeport Research and Engineering Company
    Inventors: Tadeusz K. Wiewiorowski, Phillip D. Mollere, Vivian C. Astley, David M. Dyer
  • Patent number: 4544391
    Abstract: A method for separating a desired component from a solid mixture by repeated recrystallization in a single vertical crystallizer having a plurality of chambers partitioned by solid-liquid separation means, which comprises intermittently feeding a solid mixture to the top chamber and a solvent to the bottom chamber, dissolving the solid in each chamber in the solvent by heating after feeding of the solid mixture to the top chamber, transferring the resulting solution in each chamber to the adjacent lower chamber while taking out from the bottom chamber the solution from which the desired component is recovered as an end product, cooling the solution in each chamber to precipitate crystals, and transferring the resulting mother liquor in each chamber upwardly through the separation means not capable of passing the resulting crystals by the feeding of the solvent to the bottom chamber, while allowing excess mother liquor to overflow from the top of the crystallizer, the above procedures being repeated continuous
    Type: Grant
    Filed: October 15, 1982
    Date of Patent: October 1, 1985
    Assignee: Kohjin Co., Ltd.
    Inventor: Hiroshi Oka
  • Patent number: 4333737
    Abstract: A process is provided for reclaiming materials from photoflash cartridges ich are comprised of aluminum, barium nitrate and potassium perchlorate. The photoflash composition is dumped into heated water to dissolve barium nitrate and potassium perchlorate and the solution is then filtered to remove aluminum. Then the solution is cooled to precipitate the barium nitrate and the potassium perchlorate and the precipitated salts are then removed by filtering.
    Type: Grant
    Filed: April 30, 1981
    Date of Patent: June 8, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Francis E. Montgomery, James E. Short, Jr., William J. Weaver
  • Patent number: 4271131
    Abstract: Highly pure lithium chloride suitable for use in production of lithium metal by electrolysis is obtained directly from impure natural or other lithium chloride brines by an integrated process in which the brine is first concentrated by solar energy to a lithium chloride concentration of about 3%, after which the brine is treated with lime and calcium chloride to convert such impurities as boron, magnesium and sulfate to a calcium borate hydrate, magnesium hydroxide and calcium sulfate dihydrate, respectively, and separating the precipitated calcium sulfate dihydrate from the brine. The brine is then further concentrated to 40% or more lithium chloride by means of solar or other energy, during which concentration step the calcium borate hydrate, magnesium hydroxide and calcium sulfate dihydrate precipitate from the brine. The highly concentrated brine is subjected to evaporation at a temperature above 101.degree. C. to produce anhydrous lithium chloride which is further heated to a temperature of 200.degree.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: June 2, 1981
    Assignee: Foote Mineral Company
    Inventors: Patrick M. Brown, Susan R. Jacob, Daniel A. Boryta
  • Patent number: 4087253
    Abstract: A method of obtaining caustic soda and pure sodium chloride from an electrolytic cell liquor containing also sulfate ions including the steps of concentrating the liquor through multiple effect evaporation, cooling the concentrate obtained, separating the sodium chloride and the salt containing sulfate and recovering the caustic soda, whereby during a first stage the liquor is evaporated so as to precipitate only sodium chloride which is removed, in a second stage a solid phase is formed of sodium chloride, sodium sulfate and triple salt of caustic soda, sodium chloride and sodium sulfate, with said solid phase being contacted with a caustic soda solution of less than about 35% by weight concentration, so as to decompose said triple salt, removing the salt containing sulfate, and in a third stage the solution from the second stage is cooled to precipitate said triple salt of caustic soda, sodium chloride and sodium sulfate, which is separated from the caustic soda which does not crystallize and is removed fro
    Type: Grant
    Filed: March 25, 1976
    Date of Patent: May 2, 1978
    Assignee: Rhone-Poulenc Industries
    Inventors: Guy Zabotto, Jean-Marie Guichard, Daniel Fournier
  • Patent number: 4079116
    Abstract: A process for producing a high purity ammonium heptamolybdate and/or ammonium dimolybdate product by which a particulated molybdenum oxide concentrate is purified to remove contaminating metal cations, whereafter it is leached with an ammoniacal leach solution to extract the molybdenum trioxide constituent therein as soluble ammonium molybdate compounds. The resultant ammoniacal leach solution is thereafter concentrated at an elevated temperature, whereafter at least a portion thereof is adjusted to provide an ammonia-to-molybdenum trioxide mol ratio ranging from about 0.86:1 to about 1.25:1, and the adjusted solution thereafter is cooled to effect a precipitation of ammonium heptamolybdate crystals which are separated and recovered, and the balance of the cooled solution is recirculated for admixture with additional ammoniacal leach solution.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: March 14, 1978
    Assignee: AMAX Inc.
    Inventors: Richard A. Ronzio, Phillip K. Davis, Robert C. Ziegler
  • Patent number: 4072472
    Abstract: A subterranean salt deposit is solution mined, and the resulting calcium- and sulfate-contaminated brine is treated, e.g., by soda ash, to precipitate insoluble calcium compounds. The resulting slurry is settled, and the effluent clear brine is evaporated in a series of solar ponds to produce high-grade sodium chloride.The brine becomes progressively more concentrated with respect to sodium sulfate as it moves through the solar ponds. The sulfate-enriched brine may be recycled to the solution mine, evaporated to form a sulfate-contaminated sodium chloride crystal crop, or it may be subjected to winter cooling to remove sulfate values as Glauber's salt, the residual brine being recycled to the solar ponds or the solution mine.
    Type: Grant
    Filed: December 12, 1973
    Date of Patent: February 7, 1978
    Inventor: Jerome A. Lukes
  • Patent number: 3994531
    Abstract: The present invention relates to an improved method of solution mining potassium chloride from subterranean ore deposits containing both potassium chloride and sodium chloride. By the present invention, an aqueous medium is passed through the ore deposits so that potassium chloride and sodium chloride are dissolved therein. Magnesium chloride is combined with the aqueous brine solution formed so that an aqueous brine solution containing potassium chloride, sodium chloride and magnesium chloride in specific proportions is produced, and the solubility of potassium chloride in the solution is reduced. The combined aqueous brine solution is then concentrated so that it is substantially saturated with potassium chloride, and the concentrated solution is cooled to cause the precipitation of substantially pure potassium chloride.
    Type: Grant
    Filed: September 3, 1971
    Date of Patent: November 30, 1976
    Assignee: Continental Oil Company
    Inventors: David S. Dillard, Jr., J. Gilbert Davis, II, Richard L. Every