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| Number | Title | Issue Date |
| 8182784 | Process for the time recovery of sulphate of potash (SOP) from sulphate rich bittern 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 us... | 05/22/2012 |
| 7604792 | Separation of purified potassium sulfate from glaserite 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 s... | 10/20/2009 |
| 7442323 | Potassium monopersulfate solutions 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. ... | 10/28/2008 |
| 7235183 | Glycerine foots salt separation system The present invention provides a method and apparatus for the recovery of salt from a glycerine process, allowing the salt to be used in a brine solution. A salt settling tank is positioned inline between the foots from a crude still bottom and a foot still. Salt se... | 06/26/2007 |
| 7045110 | High yield co-production of anhydrous hydrogen bromide and sodium bisulfate 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... | 05/16/2006 |
| 7045111 | High yield co-production of anhydrous hydrogen bromide and sodium bisulfate 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 b... | 05/16/2006 |
| 7045109 | Conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate 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 wh... | 05/16/2006 |
| 7041268 | Process for recovery of sulphate of potash The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the ... | 05/09/2006 |
| 6986968 | Cathode active material for lithium secondary cell and method for manufacturing the same 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 LiMn | 01/17/2006 |
| 6986878 | Method of producing potassium sulfate via cation exchange 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... | 01/17/2006 |
| 6811763 | Conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate 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 wh... | 11/02/2004 |
| 6787120 | Volume reduction of aqueous waste by evaporative crystallization of burkeite and sodium salts 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 desc... | 09/07/2004 |
| 6692716 | Method of formulating alkali earth salts 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... | 02/17/2004 |
| 6691358 | Oxidized white liquor in an oxygen delignification process 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 oxy... | 02/17/2004 |
| 6676917 | Process for the production of hydrochloric acid and neutralized sulfates 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 sulfuri... | 01/13/2004 |
| 6652603 | Process for removing sodium sulfate from nickel hydroxide effluent streams 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 th... | 11/25/2003 |
| 6652820 | Methods of making cesium salts and other alkali metal salts 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... | 11/25/2003 |
| 6585950 | Method of producing chlorine dioxide 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 ... | 07/01/2003 |
| 6555078 | Method of preparing lithium salts 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 fro... | 04/29/2003 |
| 6548037 | Aluminium polychlorosulphates, process for their preparation and use thereof Aluminum polychlorosulphates having the general formula (I) Al(OH)l Clm (SO4)n Mp (I) where M represents an alkali metal l, m, n, p represent the number of moles per mole of aluminum, so that 1.74ࣘlࣘ2.25, 0.01à£... | 04/15/2003 |
| 6537962 | Composite powder The present invention pertains to a composite powder comprising (A) an alkali metal silicate particle having an average particle size of from 1 to 500 μm; and (B) a water-soluble salt particle having an average particle size of from 0.01 to 50 μm, of wh... | 03/25/2003 |
| 6531108 | Process for producing free hydroxylamine aqueous solution This invention provides a highly pure and highly concentrated free hydroxylamine aqueous solution substantially not containing any salt or organic substance. This invention is a process for obtaining a free hydroxylamine aqueous solution, comprising the s... | 03/11/2003 |
| 6419887 | Process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts A process for the treatment of residual liquors from the ammoniation and carbonation of alkali metal salts containing ammonium salts, sodium salts, soluble sodium bicarbonate, ammonium bicarbonate and water and producing purified ammonium salts, comprisin... | 07/16/2002 |
| 6375824 | Process for producing potassium hydroxide and potassium sulfate from sodium sulfate There is disclosed a process for producing a potassium sulfate electrochemically. The process involves the use of sodium sulfate which is electrolyzed in an electrolytic cell and which results in the production of sodium hydroxide and ammonium sulfate. Th... | 04/23/2002 |
| 6365122 | Process for manufacturing potassium sulfate fertilizer and other metal sulfates A new process of preparing potassium sulfate fertilizer and other metal sulfates from the chlorides and other halides of these metals. The process utilizes the discovery that sulfur dioxide or trioxide, when introduced as a fluidizing medium into shallow ... | 04/02/2002 |
| 6334990 | Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine A process for the preparation of potassium sulfate, sodium bicarbonate and sodium carbonate. The process involves the treatment of potash brines by the reaction of sodium chloride and potassium chloride with calcium sulfate and sodium sulfate. Syngenite p... | 01/01/2002 |
| 6315976 | Method of producing potassium sulfate A process is provided for producing potassium sulfate by reacting ammonium sulfate and potassium chloride at a temperature of about 30 to 40° C. to produce a slurry containing K2 SO4.multidot.NH.sub.4.multidot.2SO.sub.4 double salt,... | 11/13/2001 |
| 6231822 | Recovering chloride and sulfate compounds from spent potliner A method of recovering chloride and sulfate salts from spent potliner using acid digestion.... | 05/15/2001 |
| 6210583 | Spent caustic pretreatment and enhanced oxidation process A process for pre-treating a spent caustic stream prior to oxidation which includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate ... | 04/03/2001 |
| 6126702 | Apparatus and method for treating sesquisulfate waste streams The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone ... | 10/03/2000 |
| 6106796 | Method of ammonium sulfate purification A process is provided for recovering sodium bicarbonate and ammonium sulfate from a solution containing sodium sulfate derived from a process for removing sulfur contaminants out of a gas with sodium bicarbonate reagent. Sodium bicarbonate is precipitated... | 08/22/2000 |
| 6068822 | Desulforization method and desulfurization apparatus in geothermal power plant An uncondensed gas in steam discharged from a turbine in a geothermal power plant and separated from water with a condenser is treated by a desulfurization method comprising the combustion step of combusting the uncondensed gas in the steam to convert hyd... | 05/30/2000 |
| 5985223 | Removal of NOx and SOx emissions form pickling lines for metal treatment A process for the removal of a high percentage of NOx and SOx from the gaseous effluent of a metal pickling operation comprising passing the effluent through an aqueous scrubber, treating the gaseous effluent from the scrubber with ozone, passing the effl... | 11/16/1999 |
| 5972165 | Method of producing oxidized white liquor using dregs containing carbon particles White liquor produced from black liquor is partially or completed oxidized. The white liquor contains dregs that are utilized as a carbon based catalyst. Dregs are produced by separating the dregs from green liquor an intermediate product between the blac... | 10/26/1999 |
| 5908716 | Lithium--containing sulfates, method of preparation and uses thereof The invention provides a battery having an electrode active material comprising a mixed-metal sulfate compound. The mixed-metal consists of at least one alkali metal and at least one transition metal. Preferably, the sulfate compound is a polysulfate havi... | 06/01/1999 |
| 5879830 | Process for regenerating sodium sulphide from the sodium sulphate which forms in treating lead paste from exhausted batteries A process is disclosed for treating lead paste from exhausted batteries. Calcium sulfite and calcium thiosulfite are formed by the reaction: 3Ca(OH)2 +4S°.fwdarw.2CaS+CaS2 O3 +3H2 O(1). The CaS and CaS2 O... | 03/09/1999 |
| 5871551 | Process for the preparation of anhydrous sodium sulfate A process for the preparation of anhydrous sodium from a thenardite ore containing sodium sulfate comprising the steps of: crushing the thenardite ore; lixiviating the crushed ore in a first lixiviation step with water or with an exhausted solution from a... | 02/16/1999 |
| 5820841 | Hydrogen peroxide complexes of inorganic salts and synthesis thereof A method of making an inorganic salt-hydrogen peroxide complex includes the following steps: (a) mixing the inorganic salt with sufficient water for a time sufficient to form a soft paste, (b) mixing the paste with an aqueous hydrogen peroxide solution to... | 10/13/1998 |
| 5792441 | Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and feeds stream 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 retu... | 08/11/1998 |
| 5783084 | Process for the reclamation of process water from process wastewater generated in the battery manufacturing industry and other metals related industries A process wastewater treatment plant, and a process relating thereto, which converts process wastewater generated in battery manufacturing and the like into clean process water and sodium sulfate salt by treating the process wastewater to remove impuritie... | 07/21/1998 |
