| Patents for C01D 5 - Sulfates or sulfites of sodium, potassium, or alkali metals in general (1,848) |
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| 10/20/2004 | CN1171794C Preparation method of potassium sulfate with sulfate-type salt lake bittern containing potassium salt |
| 09/23/2004 | DE10311277A1 Production of potassium sulfate and aluminum hydroxide from alunite, comprises leaching ground and calcined alunite with water and precipitating aluminum hydroxide with potassium hydroxide |
| 09/22/2004 | CN1530324A Synthetic method for potassium sulfate with ammonia coproduction |
| 09/01/2004 | CN1164492C Method for preparing potassium sulfate |
| 08/12/2004 | WO2004067545A1 Improved method for bisulfite treatment |
| 08/04/2004 | EP1443052A1 Improved method for bisulfite treatment of nucleic acid |
| 07/28/2004 | CN1515491A Process for preparing alkali metal salt |
| 07/27/2004 | US6767528 Feeding sulfuric acid and alkali metal chloride to direct fired chamber; withdrawing product |
| 07/14/2004 | CN1512966A Methods of making cesium salts and other alkali metal salts |
| 07/07/2004 | CN1156397C Method of formulating alkali metal salts |
| 07/07/2004 | CN1156396C Method for preparing potassium sulfate by one section conversion flotation process |
| 06/30/2004 | CN1508092A Method for preparing potash manure (kali salt) from potassium-rich rock using hydrothermal chemical reaction |
| 05/26/2004 | EP1421043A1 A process for manufacturing potassium sulfate fertilizer and other metal sulfates |
| 04/22/2004 | WO2004033369A1 Improved conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate |
| 04/22/2004 | CA2501326A1 Improved conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate |
| 04/08/2004 | WO2003020663A8 A process for manufacturing potassium sulfate fertilizer and other metal sulfates |
| 04/08/2004 | US20040067192 Conversion of sodium bromide to anhydrous hydrobromic acid and sodium bisulfate |
| 04/08/2004 | US20040067191 Sequential reaction of sodium bromide and sulfuric acid in a water to produce hydrobromic acid and sodium bisulfate; conversion rate is > 95%; separation of hydrobromic acid, water and sodium bisulfate, and drying hydrobromic acid |
| 04/07/2004 | CN1486932A Production process of solid sea water |
| 04/07/2004 | CN1486931A Production process of lithium hydroxide monohydrate |
| 03/31/2004 | CN1143820C Process for preparing potassium sulfate with multiform by-products |
| 03/24/2004 | EP1399387A1 Process for removing sodium sulfate from nickel hydroxide effluent streams |
| 03/17/2004 | CN1482063A Process for preparing potassium sulfate |
| 03/17/2004 | CN1142097C Water-free potassium sulfate preparing process |
| 03/17/2004 | CN1142096C Process for extracting potassium sulfate from seawater by zeolite method |
| 03/03/2004 | EP1392615A2 Building and other materials containing treated bauxite tailings and process for making same |
| 03/03/2004 | CN1140451C Method and apparatus for preparing potassium sulfate and ammonium potassium chloride with industrial effluent containing ammonium sulfate |
| 02/18/2004 | CN1475443A Method of producing neutral high quality anhydrous sodium sulfate using natucal salt lake sodium sulfate decahydrate |
| 02/17/2004 | US6692716 Sodium sulfate and ammonium bicarbonate are reacted to form sodium bicarbonate; removal of carbonates; precipitating potassium sulfate; quality fertilizer |
| 01/20/2004 | CA2155921C Process for removing nitrogen oxides from the flue gases of a pulp mill |
| 01/13/2004 | US6676917 Process for the production of hydrochloric acid and neutralized sulfates |
| 01/02/2004 | EP1373141A1 Methods of making cesium salts and other alkali metal salts |
| 12/10/2003 | CN1460642A Method for coproducing soda, potassium sulfate and ammonium chloride |
| 11/26/2003 | EP1265692B1 Process for purifying aqueous buffer solutions |
| 11/26/2003 | CN1128760C Method for preparing potassium sulfate by using sulfate type potassium-containing bittern |
| 11/25/2003 | US6652820 Reacting cesium sulfate containing solution with lime to form solution comprising cesium hydroxide and residue comprising calcium sulfate; removing residue from solution; converting the cesium hydroxide in solution to cesium salt |
| 11/25/2003 | US6652603 Process for removing sodium sulfate from nickel hydroxide effluent streams |
| 11/19/2003 | CN1128104C Automatic control method of sodium sulfate production line |
| 11/19/2003 | CN1128103C Process for preparing potassium sulfate |
| 10/29/2003 | CN1125776C Metathesis process for producing potassium sulfate in ammonia/water medium |
| 10/29/2003 | CN1125775C Process for recovering food class CO2 from tail gas generated in preparing sodium hydrosulfife powder |
| 10/29/2003 | CN1125774C Process for recovering food class CO2 by adding alkaline tail gas to mother liquid of sodium salt of pyrosulfurous acid |
| 09/17/2003 | CN1442360A Method of producing sodium formate method sodium hydrosulfite using liquid sulfur dioxide and solid sodium carbonate |
| 09/12/2003 | WO2003074424A1 A cyclic process for continuously producing potassium sulphate and potassium sulphate produced thereby |
| 08/13/2003 | EP1334069A2 System and method for precipitating salts |
| 07/01/2003 | CA2095105C Treatment of an aqueous stream containing water-soluble inorganic sulfide compounds to selectively produce the corresponding sulfate |
| 06/19/2003 | US20030113253 Passing hot concentrated sodium sulfate brine, in molar excess through a potassium cationic exchanger and reacting eluted potassium sulfate brine with solid potash |
| 06/12/2003 | US20030108832 Aqueous borohydride compositions |
| 06/12/2003 | US20030106852 Forming precipiate fromn absorption solution; regeneration by evaporation |
| 06/04/2003 | CN1110451C Process for preparing both sodium hydroxide and sodium sulfate by secondary causticization of mother liquid from natural alkali carbonization |
| 05/28/2003 | EP0941100B1 Pharmaceutical compositions containing lamivudine and zidovudine |
| 05/22/2003 | WO2003042096A1 Aqueous borohydride compositions |
| 05/07/2003 | CN1416360A Process for purifying aqueous buffer solutions |
| 04/23/2003 | CN1412107A Production method of potassium dihydrogen phosphate |
| 03/13/2003 | WO2003020663A1 A process for manufacturing potassium sulfate fertilizer and other metal sulfates |
| 03/06/2003 | US20030044343 Process for removing sodium sulfate from nickel hydroxide effluent streams |
| 02/27/2003 | WO2002089940A3 Building and other materials containing treated bauxite tailings and process for making same |
| 02/26/2003 | CN1398784A Potassium sulfate producing process |
| 02/25/2003 | US6524546 Metal carbonates, bicarbonate, and oxides reacted with a fluidized hydrogen halide gas at a velocity that forms a fluidized bed and at a temperature of 250-800 degrees F |
| 01/09/2003 | WO2003002460A1 Process for removing sodium sulfate from nickel hydroxide effluent streams |
| 01/01/2003 | CN1097557C Process for producing high-quality potassium-containing products by salt-field method |
| 12/25/2002 | CN1386704A Process for extracting potassium sulfate from seawater by zeolite method |
| 12/18/2002 | EP1265692A1 Process for purifying aqueous buffer solutions |
| 12/04/2002 | EP1140700B1 Process for the recovery of sulphur from lead-acid battery scrap |
| 11/20/2002 | EP1258455A1 Industrial procedure for obtaining a stable adduct of NA2S04, NaCl and H2O2 |
| 11/14/2002 | WO2002089940A2 Building and other materials containing treated bauxite tailings and process for making same |
| 11/07/2002 | WO2002062705A3 System and method for precipitating salts |
| 11/05/2002 | US6475457 Process for manufacturing potassium nitrate fertilizer and other metal nitrates |
| 11/05/2002 | US6475447 Apparatus and method for treating sesquisulfate waste streams |
| 10/10/2002 | WO2002079089A1 Methods of making cesium salts and other alkali metal salts |
| 10/03/2002 | US20020143209 Reacting cesium sulfate containing solution with lime to form solution comprising cesium hydroxide and residue comprising calcium sulfate; removing residue from solution; converting the cesium hydroxide in solution to cesium salt |
| 09/26/2002 | WO2002057185A3 Process for producing potassium sulfate from sodium sulfate |
| 09/18/2002 | CN1090982C Continuous stirring vacuum sodium sulfate crystallization tech |
| 09/10/2002 | US6447738 Leaching with sulfuric acid, reducing any ferric values to ferrous, crystallizing formed double salts, washing, hydrolyzing, washing, drying, calcining |
| 08/29/2002 | WO2001028925A9 Formulation of potassium sulfate, sodium carbonate and sodium bicarbonate from potash brine |
| 08/28/2002 | CN1365958A Process for preparing K fertilizer (K salt) from K-enriched rock and lime by hydrothermal method |
| 08/28/2002 | CN1365957A Process for preparing K fertilizer or K salt from K-enriched rock and lime by hydrothermal method |
| 08/22/2002 | US20020114759 Process for the production of hydrochloric acid and neutralized sulfates |
| 08/21/2002 | CN1089258C Comprehensive utilization method of waste acid sludge |
| 08/15/2002 | WO2002062705A2 System and method for precipitating salts |
| 08/15/2002 | US20020110512 Process for manufacturing potassium nitrate fertilizer and other metal nitrates |
| 08/15/2002 | CA2423845A1 System and method for precipitating salts |
| 08/07/2002 | EP1228000A1 Production of fumed silica |
| 08/07/2002 | CN1362370A Sulfuric acid and potassium salting-out process to prepare potassium sulfate and composition fertilizer |
| 07/30/2002 | CA2265728C Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed |
| 07/25/2002 | WO2002057185A2 Process for producing potassium sulfate from sodium sulfate |
| 07/23/2002 | US6423202 Process for making gold salt for use in electroplating |
| 07/16/2002 | US6419887 Mixing with sulfuric acid |
| 07/09/2002 | CA2026374C Recovery of ida and glauber's salt from waste crystal liquors |
| 07/03/2002 | CN1356262A Process for recovering food-class CO2 from tail gas generated in preparing Na2S2O4.2H2O powder |
| 07/03/2002 | CN1356261A Process for recovering food-class CO2 by adding alkaline tail gas to mother liquid of sodium salt of pyrosulfurous acid |
| 06/20/2002 | US20020076375 Metal carbonates, bicarbonate, and oxides reacted with a fluidized hydrogen halide gas at a velocity that forms a fluidized bed and at a temperature of 250-800 degrees F |
| 06/19/2002 | CN1354126A Process for preparing anhydrous high purity sodium sulfide |
| 06/18/2002 | CA2012669C Recovery of glycine and glauber's salt from waste crystal liquors |
| 06/12/2002 | CN1086178C Process for preparing potassium sulfate by using potassium chloride and ammonium sulfate |
| 05/08/2002 | CN1084299C Process for producing potassium sulfate through mixing and heating directly potassium chloride and ammonium sulfate |
| 04/23/2002 | US6375824 Process for producing potassium hydroxide and potassium sulfate from sodium sulfate |
| 04/02/2002 | US6365122 Process for manufacturing potassium sulfate fertilizer and other metal sulfates |
| 03/27/2002 | CN1341558A Method for preparing potassium sulfate |
| 03/27/2002 | CN1341557A Joint production process of salt and salt-cake |