Alkali Metal Containing (li, Na, K, Rb, Or Cs) Patents (Class 423/551)
  • Patent number: 10815130
    Abstract: Systems and methods of producing potassium sulfate can involve converting a mixed salts feed stream into a conversion end slurry in a conversion unit, the mixed salts feed comprising at least one potassium-containing salt, at least one chloride-containing salt, at least one magnesium-containing salt and at least one sulfate-containing salt and the conversion end slurry comprising schoenite; separating conversion end slurry into a conversion end solids stream and a conversion brine; leaching the conversion end solids stream in a crystallization unit to produce a potassium sulfate product stream comprising potassium sulfate and a crystallizer mother liquor comprising magnesium sulfate and potassium sulfate; collecting heat generated in the conversion unit by a heat pump; and providing at least a portion of the heat collected to the crystallization unit to regulate a temperature of the potassium sulfate product stream and the crystallizer mother liquor stream contained in the crystallization unit.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: October 27, 2020
    Assignee: NOVOPRO PROJECTS INC.
    Inventors: Maziar Rejaee, Tom Neuman, Richard Warren Chastain, Antoine Lefaivre
  • Patent number: 10689261
    Abstract: The present invention relates to a process for producing sodium sulphate from phosphogypsum, comprising: a step (101) of lixiviation of phosphogypsum by means of a basic solution so as to obtain a sodium sulphate solution (S) containing metal impurities, said basic solution comprising a chelating agent suitable for forming complexes with at least one part of said metal impurities, at least one first step (103, 104) of filtration of the sodium sulphate solution by a nanofiltration membrane (NF1, NF2), so as to form a concentrate (C1, C2) containing said complexes and a permeate (P1, P2), a step (105) of evaporation of the permeate (P1, P2) so as to form anhydrous sodium sulphate.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: June 23, 2020
    Inventors: Khaoula Khaless, Driss Dhiba
  • Patent number: 9139446
    Abstract: Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K2SO4, crystallizing recycle crystals, and mixing at least a portion of the recycle crystals with the aqueous solution. Systems for processing potassium sulfate and magnesium sulfate include a first crystallizer and a second crystallizer in fluid communication with the second mix tank. The second crystallizer is structured and adapted to precipitate recycle crystals from the concentrated liquor to form a potassium-depleted recycle brine. The recycle crystals precipitated in the second crystallizer have a composition suitable to be recycled to the first crystallizer to increase the production of SOP.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: September 22, 2015
    Assignee: INTERCONTINENTAL POTASH CORP. (USA)
    Inventors: Steven L. Chastain, Michael J. Morrison, Richard W. Chastain, Donial M. Felton, Thomas H. Neuman
  • Patent number: 9023309
    Abstract: Processes are for the conversion of the sulfur compounds to elemental sulfur through different catalytic stages after the reaction furnace of the Claus unit with air or oxygen. The steps are: 1—Conventional Claus thermal or catalytic stage; 2—Oxygen Scavenger catalytic stage to capture excess oxygen from the reaction furnace and to perform Claus reaction; a Selective Reduction stage that converts SO2 to elemental sulfur; and 4—Selective Oxidation stage that converts H2S to elemental sulfur. The tail gas flows to the incineration and stack and to the incineration plus caustic scrubber for achieving zero emissions.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: May 5, 2015
    Inventors: Mahin Rameshni, Stephen L. Santo
  • Patent number: 8968696
    Abstract: The invention relates to a potassium sulphate powder wherein about 80 wt % or more of the powder has a particle size of about 0.2 mm or lower, preferably about 0.13 mm or less. The particle size preferably is such, that about 80 wt % or more is about 0.02 mm or higher, more preferably about 0.04 mm or higher. This potassium sulphate powder dissolves easily in water, more in particular, 50 gram of said potassium sulphate powder dissolves in 1 liter of water without stirring within 1 minute, preferably within 30 sec. This potassium sulphate powder is very suitable as foliar fertilizer, in particular for broad acre crops. Further, the invention relates to the use of foliar potassium fertilizer, to enhance the uptake of potassium from the soil.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: March 3, 2015
    Assignee: Tessenderlo Chemie N.V.
    Inventors: Michel Marchand, Nicolas White, Peter Landuyt, Peter Luts
  • Patent number: 8916118
    Abstract: The invention relates to a CO2 y SO2 capture method comprising the following steps consisting in: a) introducing an aqueous stream of a hydroxide of an alkali or alkaline-earth metal and another gas stream of CO2 into a bubble column purifier/reactor, in order to form a carbonate of the alkali or alkaline-earth metal; b) introducing the carbonate of the alkali or alkaline-earth metal into a bubble column purifier/reactor, into which a stream of a gas mixture of CO2 and SO2 is introduced in order to form sulphite of an alkali or alkaline-earth metal and carbon dioxide; c) transforming the sulphite from step (b) into sulphate of said metal by means of oxidation with air; and d) re-circulating the unreacted CO2 produced during step (b) by reacting the slurry with the SO2, in the reactor from step (a).
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: December 23, 2014
    Assignees: Consejo Superior De Investigaciones Cientificas, Universidad De Sevilla, Universidad De Cadiz
    Inventors: Cristian Cardenas Escudero, Luis Maria Esquivias Fedriani, Victor Morales Florez, Alberto Santos Sanchez
  • Publication number: 20140227598
    Abstract: A main object of the present invention is to provide an anode active material capable of increasing energy density at the same time increasing battery safety, and a metal ion battery prepared with the anode active material. The present invention is an anode active material including an element that belongs to alunite group capable to insert and remove an ion(s) of at least one metal element selected from the group consisting of alkali metal elements and alkaline-earth metal elements, and a metal ion battery having a cathode, an anode, and an electrolyte filled between the cathode and the anode, the electrolyte conducting a metal ion(s), wherein the anode active material is contained in the anode.
    Type: Application
    Filed: October 9, 2012
    Publication date: August 14, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shigeki Sato, Masafumi Nose, Hideki Nakayama
  • Patent number: 8802048
    Abstract: Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K2SO4, crystallizing recycle crystals, and mixing at least a portion of the recycle crystals with the aqueous solution. Systems for processing potassium sulfate and magnesium sulfate include a first crystallizer and a second crystallizer in fluid communication with the second mix tank. The second crystallizer is structured and adapted to precipitate recycle crystals from the concentrated liquor to form a potassium-depleted recycle brine. The recycle crystals precipitated in the second crystallizer have a composition suitable to be recycled to the first crystallizer to increase the production of SOP.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: August 12, 2014
    Assignee: Intercontinental Potash Corp. (USA)
    Inventors: Steven L. Chastain, Michael J. Morrison, Richard W. Chastain, Donial M. Felton, Thomas H. Neuman
  • Patent number: 8721999
    Abstract: Kainite mixed salt is treated with water to obtain solid schoenite and a schoenite end liquor. The latter is desulphated using recycled CaCl2 and thereafter evaporated to obtain camallite crystals, from which KCl is recovered, and a liquor rich in MgCl2. Gypsum produced during desulphatation is reacted with aqueous ammonia and CO2 to produce ammonium sulphate and calcium carbonate. The calcium carbonate is calcined to obtained CaO and CO2. The CaO is slaked and reacted with the MgCl2-rich liquor generated above to produce slurry of Mg(OH)2 in aqueous CaCl2. To this surface modifying agent is added while hot and, after cooling, the slurry yields surface modified Mg(OH)2. The filtrate rich in CaCl2 is recycled for desulphatation process above. The solid surface modified Mg(OH)2 may he calcined to produced MgO. The schoenite and KCl are reacted to produce solid sulphate of potash.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: May 13, 2014
    Assignee: Council of Scientific and Industrial Research
    Inventors: Pushpito Kumar Ghosh, Haresh Mahipatlal Mody, Jatin Rameshchandra Chunawala, Maheshkumar Ramniklal Gandhi, Hari Chand Bajaj, Pratyush Maiti, Himanshu Labhshanker Joshi, Hasina Hajibhai Deraiya, Upendra Padmakant Saraiya
  • Patent number: 8709375
    Abstract: A method for preparing an oil extractor is provided. The method includes dissolving 0.1˜30% by weight of a potassium sulfate, 0.1˜30% by weight of a potassium persulfate, and 0.1˜30% by weight of a manganese sulfate in a solvent to form a solution; heating the solution to synthesize a compound by a microwave; cooling a temperature of the compound to a room temperature; and removing the solvent from the compound. An extractor prepared from the method is also provided.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 29, 2014
    Assignee: National Tsing Hua University
    Inventors: Yong-Chien Ling, Jen-Yu Liu
  • Publication number: 20140072507
    Abstract: Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K2SO4, crystallizing recycle crystals, and mixing at least a portion of the recycle crystals with the aqueous solution. Systems for processing potassium sulfate and magnesium sulfate include a first crystallizer and a second crystallizer in fluid communication with the second mix tank. The second crystallizer is structured and adapted to precipitate recycle crystals from the concentrated liquor to form a potassium-depleted recycle brine. The recycle crystals precipitated in the second crystallizer have a composition suitable to be recycled to the first crystallizer to increase the production of SOP.
    Type: Application
    Filed: September 10, 2013
    Publication date: March 13, 2014
    Applicant: INTERCONTINENTAL POTASH CORPORATION
    Inventors: Steven L. CHASTAIN, Michael J. MORRISON, Richard W. CHASTAIN, Donial M. FELTON, Thomas H. NEUMAN
  • Patent number: 8658122
    Abstract: This invention refers to a novel process to obtain magnesium hydroxide and sodium sulfate from a solid raw material, which contains sodium and magnesium soluble salts, preferably in the form of sulfates, coming from a natural source or as a byproduct of an industrial process. The process consisting in the conditioning of the raw material to guarantee the correct concentrations of sodium and magnesium sulfates that is subjected to a salting-out crystallization when mixed with sodium sulfate obtaining sodium sulfate; the resulting solution is subjected to an alkali treatment to precipitate the magnesium hydroxide and the mother liquor is fed to a regeneration stage of the alkali used in the precipitation of the magnesium hydroxide as well in the sodium sulfate solution for the crystallization. The crystallization can be performed as a multistage process countercurrent to increase the purity of sodium sulfate.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: February 25, 2014
    Assignee: Servicios Administrativas Penoles S.A. de C.V.
    Inventors: Jesús Manuel Martinez Martinez, Armando Garcia López, José Gertrudis Bocanegra Rojas, Ricardo Benavides Pérez
  • Patent number: 8551440
    Abstract: There is provided a low sodium sea salt and a method for producing the same. A first amount of natural seawater containing sodium, chloride, potassium, magnesium, sulfate and other trace minerals is introduced into a containment structure which is periodically exposed to the sun. Preferably, the containment structure is located outdoors in an arid climate with direct exposure to sunlight. An amount of water is evaporated forming a brine. An amount of sodium chloride is crystallized and an amount of the crystallized sodium chloride is removed so that the remaining brine includes substantial amounts of potassium, magnesium and sulfate. A second amount of natural seawater is combined with the remaining brine forming a diluted brine. An amount of water is evaporated from the diluted brine. Sodium chloride, potassium sulfate and magnesium sulfate is crystallized forming a low sodium sea salt whereby the sodium chloride is no more than 70 weight percent.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: October 8, 2013
    Assignee: Ocean's Flavor Foods, LLC
    Inventors: Alan W. Kirchner, Alan Fisher
  • Patent number: 8551429
    Abstract: Methods of forming potassium sulfate include calcining polyhalite ore particles to convert the polyhalite ore particles to a water-soluble composition. At least a portion of the water-soluble composition is dissolved in an aqueous medium to form an aqueous solution comprising K+, Mg2+, and SO42? ions and a calcium-containing solid. The calcium-containing solid is separated from the aqueous solution to form a filtrate comprising K+, Mg2+, and SO42? ions. A potassium-containing salt is dissolved in the filtrate to increase the concentration of K+ and SO42? ions to from a concentrated liquor, and K2SO4 is crystallized from the concentrated liquor. A system for processing polyhalite ore includes a countercurrent leaching apparatus, a first mix tank, an evaporator, and at least one crystallizer.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: October 8, 2013
    Assignee: Intercontinental Potash Corp. (USA)
    Inventors: Thomas H. Neuman, Richard W. Chastain, Donial M. Felton, Daniel C. Neuman, Otto C. Schnauber
  • Patent number: 8523975
    Abstract: Salts of mineral nutrients stabilized with amino acids and/or ammonium salt, product and food supplement in which they are included and procedures of obtention, where the salts are obtained with anions of organic acids or inorganic anions and metallic cations associated with amino acids and/or ammonium salt, in which the invention introduces its general structure: {[Ac]n?·Men+?n[Amino acid and/or ammonium salt]}·xH2O Where ? represents a covalent dative bond, These new compounds have better taste and more solubility in water, making them more bioavailable.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: September 3, 2013
    Inventors: Eduardo Walter Ettlin, Jose Ruben Boccio, Adrian Tomas De Paoli, Edgardo Adrian Hager, Pablo Adrian De Paoli
  • Patent number: 8518357
    Abstract: Methods, systems, and apparatus for managing sulfur are disclosed. In some embodiments, the method comprise the following: obtaining material containing sulfur; refining the material to develop a high sulfur content heavy fraction fuel oil and a low sulfur content light fraction fuel oil; burning the low sulfur content light fraction fuel oil in apparatus that emit to the atmosphere; burning the high sulfur content heavy fraction fuel oil to produce energy thereby generating flue gas containing sulfur oxide; and removing and disposing of sulfur in the flue gas using a sulfur sequestration system that includes utilizing sulfur removed from the flue gas to form a brine material.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: August 27, 2013
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Klaus S. Lackner, Tim A. Rappold
  • Patent number: 8460631
    Abstract: The process concerns hydrometallurgical processing of manganese sulphate and manganese dithionate containing liquors and recovery of water therefrom. Sodium sulphate and/or sodium dithionate containing liquors are derived from manganese sulphate and manganese dithionate containing liquids, which are then cooled to produce crystals of sodium sulphate decahydrate and sodium dithionate dehydrate. The sodium sulphate decahydrate and sodium dithionate dehydrate crystals are then heated to a temperature sufficient to decompose the sodium sulphate decahydrate crystals to form anhydrous sodium sulphate crystals, sodium dithionate hydrate crystals and water, after which water is removed from the sodium sulphate and sodium dithionate hydrate crystal. The sodium sulphate and sodium dithionate dehydrate crystals are then heated to form anhydrous sodium sulphate, sulfur dioxide and water or steam. The anhydrous sodium sulphate is then separated from the sulfur dioxide and water.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: June 11, 2013
    Assignee: American Manganese Inc.
    Inventors: Norman Chow, Anca-Mihaela Nacu, Douglas Warkentin, John Wentworth Fisher
  • Patent number: 8420215
    Abstract: A cyclic process for the preparation of barium sulphate and lithium-iron phosphate comprising (i) preparing an aqueous solution containing lithium and sulphate ions and (ii) adding solid barium hydroxide at a temperature of more than 50° C., wherein the barium hydroxide is added over a period of less than 15 minutes. Also, barium sulphate obtainable by the process according to the invention.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: April 16, 2013
    Assignee: Sued-Chemie IP GmbH & Co. KG
    Inventors: Christian Vogler, Klaus Langer, Andreas Pollner, Gerhard Nuspl
  • Patent number: 8367036
    Abstract: The invention provides a novel polyanion-based electrode active material for use in a secondary or rechargeable electrochemical cell, wherein the electrode active material is represented by the general formula AaMb(SO4)2Zd.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: February 5, 2013
    Assignee: Valence Technology, Inc.
    Inventors: Jeremy Barker, M. Yazid Saidi
  • Publication number: 20120321547
    Abstract: A method and a system for the production of potassium sulfate. The method comprises reacting a source of water soluble potassium with a magnesium sulfate-containing substance in presence of an aqueous alcoholic solution.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 20, 2012
    Applicant: Nichromet Extractions Inc.
    Inventors: Jean-Marc Lalancette, Bertrand Dubreuil, David Lemieux
  • Patent number: 8251694
    Abstract: A method for of reducing the acidity and lowering the acid dewpoint of flue gas, the method steps including partially combusting the fuel in a first stage to create a reducing environment; maintaining the reducing environment for a sufficient time period such that reducible acids are reduced to achieve a desirable acidity concentration in the flue gas; and combusting the remainder of the fuel and combustion intermediates in a second stage with oxidizing environment; thereby decreasing the acidity and lowering the acid dewpoint of the flue gas by reducing the acid concentration of the gas.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: August 28, 2012
    Assignee: Nalco Mobotec, Inc.
    Inventor: Brian S. Higgins
  • Patent number: 8182784
    Abstract: The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA). Lime is treated with DPA in water for the production of highly soluble Ca (DPA)2, which in turn treated with SEL to produce insoluble K(DPA). K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA)2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite.
    Type: Grant
    Filed: December 27, 2005
    Date of Patent: May 22, 2012
    Assignee: Council of Scientific & Industrial Research
    Inventors: Parimal Paul, Pushpito Kumar Ghosh, Kaushik Jethalal Langalia, Palani Sivagnana Subramanian, Suresh Eringathodi, Subrata Patra, Pragati Agnihotri
  • Patent number: 7928033
    Abstract: The present invention relates to a catalyst for reducing mercury, which comprises a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them, as a main reagent of a catalyst component. And the present invention relates to the catalyst for reducing mercury, wherein the catalyst component is mixed with a different salt as an agent for inhibiting crystallization of the catalyst component.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: April 19, 2011
    Assignees: Horiba, Ltd., Nippon Instruments Corporation
    Inventors: Shigeyuki Akiyama, Junji Kato, Fujio Koga, Koji Ishikawa
  • Patent number: 7897125
    Abstract: Embodiments of the invention provide a system and process for recovering useful compounds from a byproduct composition produced in a silicon tetrafluoride production process.
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: March 1, 2011
    Inventors: Vithal Revankar, Sanjeev Lahoti
  • Patent number: 7887776
    Abstract: A method is disclosed for production of a sulfate-containing chlorine free salt and anhydrous gaseous HCl from a metal chloride (MClx), oleum and water. MClx and oleum are mixed together with a water-containing liquid, forming gaseous HCl and a solution of a sulfate-containing salt. The salt is precipitated from the solution, and in a preferred embodiment, the supernatant liquid from the precipitation is recycled to the reaction mixture as the water-containing liquid in subsequent reaction cycles. The exothermicity of the reaction between the water-containing liquid and the oleum is sufficient to remove chlorine in the form of substantially pure useful HCl and enables the process to proceed without additional heating of the reaction mixture. When the metal is potassium, this method produces high-purity novel sulfate salts with high potassium content K3(NH4)(SO4)2, 3K2SO4.MgSO4 and 3K2SO4.CanMg1-nSO4.
    Type: Grant
    Filed: June 15, 2008
    Date of Patent: February 15, 2011
    Inventor: Leonid Finkelshtein
  • Patent number: 7780941
    Abstract: A process for producing potassium magnesium sulfate, comprising reacting sulfuric acid with potassium chloride and magnesium chloride at a temperature in a range comprised between about 100 and about 160° C., thereby producing potassium magnesium sulfate and hydrochloric acid, the sulfuric acid being reacted with potassium chloride and magnesium chloride simultaneously or sequentially.
    Type: Grant
    Filed: July 6, 2009
    Date of Patent: August 24, 2010
    Assignee: Nichromet Extraction Inc.
    Inventors: Jean-Marc Lalancette, David Lemieux, Bertrand Dubreuil
  • Patent number: 7695699
    Abstract: A metal sulfate alcohol composition as well as a process to produce such composition is disclosed. Also disclosed is a process to produce polyester containing the metal sulfate alcohol composition.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: April 13, 2010
    Inventor: Jiwen F. Duan
  • Patent number: 7604792
    Abstract: A method can, in one general aspect, include steps for the recovery of potassium sulfate and mirabilite from glaserite. In another general aspect, a method includes dissolving glaserite in water at an elevated temperature to produce a saturated or nearly saturated solution, and cooling the solution to a temperature where potassium sulfate and mirabilite will crystallize from the solution as stable phases. In yet another general aspect, a method includes adding glaserite to a saturated solution of glaserite in water and mixing for enough time at a temperature where the glaserite will decompose into potassium sulfate and mirabilite as stable phases. In yet another general aspect, a method includes separating potassium sulfate from mirabilite using a froth floatation process.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: October 20, 2009
    Assignee: Searles Valley Minerals Operations Inc.
    Inventor: James Logan Fairchild
  • Patent number: 7575734
    Abstract: The invention is directed to a process for the manufacture of optionally doped nanoparticulate metal sulfate wherein the metal is selected from polyvalent metals or monovalent transition metals, said process comprising the step of heating a reaction mixture comprising a) a polar organic solvent comprising at least two hydroxy groups or a polar organic solvent comprising at least one sulfoxide group, b) a source of a polyvalent metal or monovalent transition metal, a sulfate source, and optionally a dopant metal source, and c) a base selected from i) bases having an aromatic N-containing heterocycle with the exception of imidazole, ii) bases having an aliphatic N-containing heterocycle, iii) aliphatic hydroxy-substituted amines, iv) aliphatic polyamines, v) aromatic amines, vi) ammonia and ammonia-releasing compounds, and vii) metal hydroxides. The invention is also directed to the resulting metal sulfate nanoparticles.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: August 18, 2009
    Assignee: Centrum fur Angewandte Nanotechnologie (CAN) GmbH
    Inventors: Michael Berkei, Heiner Pfundt
  • Publication number: 20090104106
    Abstract: A method can, in one general aspect, include steps for the recovery of potassium sulfate and mirabilite from glaserite. In another general aspect, a method includes dissolving glaserite in water at an elevated temperature to produce a saturated or nearly saturated solution, and cooling the solution to a temperature where potassium sulfate and mirabilite will crystallize from the solution as stable phases. In yet another general aspect, a method includes adding glaserite to a saturated solution of glaserite in water and mixing for enough time at a temperature where the glaserite will decompose into potassium sulfate and mirabilite as stable phases. In yet another general aspect, a method includes separating potassium sulfate from mirabilite using a froth floatation process.
    Type: Application
    Filed: October 16, 2008
    Publication date: April 23, 2009
    Inventor: James Logan Fairchild
  • Patent number: 7514051
    Abstract: A method for purifying heavy metal impurities (such as antimony, arsenic, iron, cadmium, and lead) from 28 to 38 weight percent aqueous crude sodium sulfate solution is achieved by adding ferric sulfate to the aqueous crude sodium sulfate solution to form a suspension, progressively neutralizing the suspension from a pH of less than 3.5 up to at least 6, and separating the ferric-sulfate-nucleated precipitate from the suspension. An oxidizing agent such as peroxide is optionally added to the suspension to augment adsorption of the heavy metals.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: April 7, 2009
    Assignee: The Doe Run Resources Corporation
    Inventor: Matthew Pratt
  • Patent number: 7514053
    Abstract: Methods for scrubbing gas streams to remove acid gases including sulfur dioxide, mercury-containing substances, and/or nitrogen oxides from the gas stream. The gas stream is contacted with a potassium-based sorbent effective for removing at least a portion of the acid gases. The partially cleaned gas stream is then contacted with an oxidant effective to remove at least a portion of the nitrogen oxides and/or mercury-containing substances after partially removing the acid gas substance.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: April 7, 2009
    Assignee: EnviroSolv Energy LLC
    Inventors: Dennis W. Johnson, Mark S. Ehrnschwender
  • Patent number: 7481987
    Abstract: A method is provided for reducing the fouling during the removal of sulfur trioxide from a flue gas stream by maintaining the reagent (i. e. sodium sesquicarbonate) in contact with the flue gas for a sufficient time and temperature to react a portion of the reagent with a portion of the sulfur trioxide to substantially avoid formation of liquid phase NaHSO4 reaction product that combines with the fly ash so as to not form a sticky ash residue that adheres to the flue gas duct, wherein the reaction product of the reagent and the sulfur trioxide is selected from the group consisting of Na2SO4, Na2S2O7 and mixtures thereof.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: January 27, 2009
    Assignee: Solvay Chemicals
    Inventor: John Maziuk, Jr.
  • Publication number: 20090011448
    Abstract: A pretreatment agent for a sample to be subjected to Limulus assay comprising an alkali metal sulfate and/or an alkaline earth metal sulfate wherein the sulfate(s) has a final concentration of 20 mM or more when the sulfate(s) is allowed to contact with the sample, or an alkali metal halide and/or an alkaline earth metal halide wherein the halide(s) has a final concentration of from 0.4 M to 1.2 M or less when the halide(s) is allowed to contact with the sample, or a kit for Limulus assay reagent comprising thereof as a composing article.
    Type: Application
    Filed: January 27, 2006
    Publication date: January 8, 2009
    Applicant: SEIKAGAKU CORPORATION
    Inventors: Toshio Oda, Jun Aketagawa
  • Patent number: 7442323
    Abstract: A composition comprising a solution of potassium monopersulfate having an active oxygen content of from about 3.4% to about 6.8% and a process for its preparation including neutralization with an alkaline material is disclosed.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: October 28, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Jeffrey Durante, Harvey James Bohn, Jr.
  • Patent number: 7045111
    Abstract: A process for co-producing anhydrous hydrogen bromide and a purified bisulfate salt by (a) reacting a bromide salt with sulfuric acid to produce crude hydrogen bromide and crude bisulfate salt; (b) purifying the crude hydrogen bromide to produce anhydrous hydrogen bromide; and (c) removing bromide from the crude bisulfate salt to form a purified bisulfate salt. There are also provided improvements in the bisulfate purification and bromine removal, whereby bromine is removed from the system by a distillation process and the bromide is removed from the crude bisulfate via a spray drying process.
    Type: Grant
    Filed: August 11, 2005
    Date of Patent: May 16, 2006
    Assignee: Poly Systems USA, Inc.
    Inventors: Richard J. DeGroot, Dov Shellef
  • Patent number: 7045110
    Abstract: A batch process for co-producing anhydrous hydrogen bromide and a purified bisulfate salt comprising: (a) charging a batch reactor with a bromide salt slurry, wherein the slurry is more than 50% by weight bromide salt; (b) reacting the slurry with sulfuric acid in a batch reaction wherein bromide salt is consumed to produce crude aqueous hydrogen bromide and crude bisulfate salt, the crude bisulfate salt containing bromine; (c) prior to or concurrently with step (b) adding hydrogen bromide to the reactor; (d) purifying the crude hydrogen bromide to produce anhydrous hydrogen bromide; and (e) removing bromine from the crude bisulfate salt to form a purified bisulfate salt.
    Type: Grant
    Filed: January 5, 2005
    Date of Patent: May 16, 2006
    Assignee: Poly Systems USA, Inc.
    Inventors: Richard J. DeGroot, Dov Shellef
  • Patent number: 7045109
    Abstract: Process for the conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate, said process with the following sequential steps: reaction of sodium bromide and sulfuric acid in a solution of water to produce hydrobromic acid and sodium bisulfate wherein the conversion of sodium bromide is greater than about 99%; adsorption of iron bromide onto a solid adsorbent; separation of hydrobromic acid and water from the sodium bisulfate; separation and drying of hydrobromic acid; and solidification of the sodium bisulfate into a flaked or granular form.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: May 16, 2006
    Assignee: Procter & Gamble
    Inventors: Jared John Schaefer, Corey James Kenneally, Daniel Martin Bourgeois, Deborah Jean Back
  • Patent number: 6986878
    Abstract: A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form further potassium sulfate.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: January 17, 2006
    Assignee: Dirdal Rand Technologies
    Inventor: Gary Derdall
  • Patent number: 6986968
    Abstract: A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoO2 and LiMn2O4, Li(Ni, Co)O2, and V-system oxide that has been researched as the active material for substituting LiCoO2 are provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe2(PO4)(SO4)(OH).6H2O] that is the mineral containing PO43?, SO42?, and OH?. LiaFebMc(PO4)x(SO4)y(OH)z ??(1) In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0?a, c?0.5, 1?b?2, 0.5?x, y, z?1.5.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: January 17, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Sik Hong, Kwang Sun Ryu, Soon Ho Chang, Yong Joon Park, Young Gi Lee, Kwang Man Kim, Nam Gyu Park, Man Gu Kang, Xiang Lan Wu
  • Patent number: 6811763
    Abstract: Process for the conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate, said process with the following sequential steps: reaction of sodium bromide and sulfuric acid in a solution of water to produce hydrobromic acid and sodium bisulfate wherein the conversion rate is greater than about 95%; separation of hydrobromic acid and water from the sodium bisulfate; separation of hydrobromic acid from water; and drying of hydrobromic acid.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: November 2, 2004
    Assignee: The Procter & Gamble Company
    Inventors: Daniel Martin Bourgeois, Corey James Kenneally
  • Patent number: 6787120
    Abstract: A method of treating aqueous salt solutions to provide a solution suitable for vitrification to a stable glass matrix for long term storage is described. In particular, salt solutions composed of aqueous nuclear waste materials are suitable for treatment by the described method. Specifically, salt solutions which have a sulfate to sodium mole ratio that does not permit easy vitrification into stable glasses may be treated by the present invention. The present method decreases the volume of vitrified glass.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: September 7, 2004
    Assignee: Cogema Engineering Corporation
    Inventor: Donald James Geniesse
  • Patent number: 6692716
    Abstract: Methodology for formulating sodium bicarbonate and potassium sulfate. In one embodiment, sodium sulfate and ammonium bicarbonate are reacted to form sodium bicarbonate with the remaining liquor or brine treated with sulfuric acid to remove carbonates with subsequent precipitation of potassium sulfate. A further embodiment employs ammonium bicarbonate, ammonia gas or carbon dioxide to precipitate sodium bicarbonate. The result of the methods is the production of high quality fertilizer and food grade sodium bicarbonate.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: February 17, 2004
    Assignee: Airborne Industrial Minerals, Inc.
    Inventor: Robin Phinney
  • Patent number: 6691358
    Abstract: The invention refers to a method for an integrated treatment of cellulose pulp. The method includes the steps: providing said cellulose pulp (1), providing a determined quantity of white liquor (2) including alkali and sulphur components, providing an oxygen-containing gas, oxidizing (5) the sulphur components of the white liquor by the supply of a part of said gas in such a way that at least a part of the sulphur is present in the form of sulphate, transporting the cellulose pulp having a certain kappa number to at least one mixing device (4), and supplying the oxidized white liquor from the oxidizing step to the cellulose pulp, supplying a part of said gas to the cellulose pulp in said mixing device, mixing the cellulose pulp with the oxidized white liquor and said gas in said mixing device, and transporting the cellulose pulp from said mixing device to a delignification reactor (6) for oxygen delignification of said cellulose pulp, wherein the kappa number is reduced.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: February 17, 2004
    Assignee: AGA Aktiebolag
    Inventors: Anders Tor Jörgen Engström, Anna Tigerström
  • Patent number: 6676917
    Abstract: A process for the production of hydrochloric acid and neutralized sulfates comprising: reacting sulfuric acid with an alkaline metal chloride in order to obtain a liquor containing hydrochloric acid, an acid alkaline metal sulfate and an excess of sulfuric acid; separating the hydrochloric acid from the liquor containing the hydrochloric acid, the acid alkaline metal sulfate and the excess of sulfuric acid; neutralizing the acid alkaline metal sulfate and the excess sulfuric acid by adding to the remaining liquor after the separation of the hydrochloric acid a neutralizing agent to obtain a neutralized mass; cooling the neutralized mass to crystallize the neutralized alkaline metal sulfate and obtain neutralized alkaline metal sulfate crystals; and separating the neutralized alkaline metal sulfate crystals from the liquor.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: January 13, 2004
    Inventor: José Cabello-Fuentes
  • Patent number: 6652820
    Abstract: A method of making a cesium salt is described and involves reacting a cesium sulfate containing solution with lime to form 1) a solution containing at least cesium hydroxide and 2) a residue comprising calcium sulfate. The method further involves removing the residue from the solution and converting the cesium hydroxide that is present in the solution to at least one type of cesium salt. The present invention further relates to uses of the cesium salt as well as methods of making cesium hydroxide using lime. Also, methods of making alkali metal salts and alkali metal hydroxides are also described.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: November 25, 2003
    Assignee: Cabot Corporation
    Inventor: Bart F. Bakke
  • Patent number: 6652603
    Abstract: A method for removing sodium sulfate from nickel and ammonia containing aqueous effluents. The effluents, typically from a nickel hydroxide production process, are cooled to or below 30° C. to crystallize and precipitate the sodium sulfate and dewater the effluent. The sodium sulfate is retrieved and the remaining solution is recycled back to the nickel hydroxide production process.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: November 25, 2003
    Assignee: Inco Limited
    Inventors: Juraj Babjak, Feng Zou
  • Patent number: 6585950
    Abstract: The invention relates to a process of producing chlorine dioxide comprising the steps of reducing chlorate ions in an acid reaction medium maintained in a reaction zone of a chlorine dioxide generator, which reaction medium contains alkali metal ions and sulfate ions, so to form chlorine dioxide and a solid salt of acidic alkali metal sulfate. The process further comprises the steps of separating said solid acidic alkali metal sulfate from the reaction medium, contacting said solid acidic alkali metal sulfate with an aqueous medium in a mixing tank to effect at least partial conversion to neutral solid alkali metal sulfate, separating the at least partially neutralized solid alkali metal sulfate from the aqueous medium on a rotary drum filter operating with vacuum inside and with part of the drum submerged in a slurry of the at least partially neutralized solid alkali metal sulfate and the aqueous medium, and forming an acid filtrate.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: July 1, 2003
    Assignee: Eka Nobel AB
    Inventors: Anders Dahl, Roy Hammer-Olsen, Philip Byrne
  • Publication number: 20030113253
    Abstract: A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form further potassium sulfate.
    Type: Application
    Filed: December 19, 2002
    Publication date: June 19, 2003
    Applicant: Dirdal Rand Technologies
    Inventor: Gary Derdall
  • Patent number: 6555078
    Abstract: The present invention provides an inexpensive process for the preparation of lithium salts of formula LiX having a desired or required level of purity using lithium chloride and lithium sulfate. In the process of the invention, a lithium salt selected from lithium chloride, lithium sulfate, and combinations thereof is reacted with NaX or KX in a aqueous, semiaqueous, or organic solution and the precipitated salts are removed to obtain the LiX solution of desired purity. Preferably, a semiaqueous solution containing water and an organic solvent is used at some point in the reaction. The process of the invention eliminates the use of highly acidic materials and thus reduces the cost of raw materials and the need for specialized equipment.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: April 29, 2003
    Assignee: FMC Corporation
    Inventor: Vijay Chandrakant Mehta