| Patents for C01D 5 - Sulfates or sulfites of sodium, potassium, or alkali metals in general (1,848) |
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| 01/26/2000 | EP0796222B1 Co-production of potassium sulfate and sodium sulfate |
| 01/26/2000 | CN1242341A Method for prodn. of potassium sulfate by circulating potassium hydrogen sulfate and decomposing potassium chloride |
| 01/19/2000 | CN1048470C Process for producing agricultural potassium sulfate |
| 01/05/2000 | CN1240195A Process for preparing potassium sulfate by using potassium chloride and aminium sulfate |
| 12/28/1999 | US6007639 Blasting process for removing contaminants from substrates and potassium magnesium sulfate-containing blast media |
| 12/23/1999 | WO1999065823A1 Method of procucing potassium sulfate |
| 12/15/1999 | CN1047367C Process for producing patassium sulfate |
| 12/08/1999 | WO1999064137A1 Method for removing hydrogen sulfide from natural gas |
| 12/08/1999 | CA2288645A1 Method for removing hydrogen sulfide from natural gas |
| 12/01/1999 | CN1236734A Process for preparing soft leonite |
| 11/10/1999 | CN1046252C Method for preparing potassium sulfate by double decomposition of potassium chloride and ammonium sulfate |
| 11/02/1999 | US5976485 Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide. drawing through a cooling crystallizer where alkali is added. |
| 10/27/1999 | CN1232786A Technological process of preparing potassium sulfate with chromium containing sodium sulfate |
| 10/27/1999 | CN1045947C Method for producing sulfonyl azophoska compound fertilizer |
| 10/20/1999 | CN1045760C Method for treatment of potash feldspar, and use of obtained matter |
| 10/06/1999 | EP0946408A1 Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed |
| 09/21/1999 | CA2162191C Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler |
| 09/15/1999 | EP0941100A2 Pharmaceutical compositions containing lamivudine and zidovudine |
| 09/01/1999 | CN1227188A Metathesis process for producing potassium sulfate in ammonia/water medium |
| 08/31/1999 | CA2148462C Metathesis of acidic by-product of chlorine dioxide generating process |
| 08/17/1999 | CA2033326C Process for binding dust in fertilizer granules |
| 07/28/1999 | CN1223964A Process for producing potassium sulfate |
| 07/21/1999 | CN1044222C Method for comprehensive utilization of sodium sulfate containing chromium |
| 07/14/1999 | CN1044108C Method for preparing potassium sulfate with sulfate-type bittern |
| 06/30/1999 | CN1220968A Technology for preparation of potassium sulfate using potassium resource and magnesium resource and natural thenardite |
| 06/16/1999 | CN1043636C Concentration nitre extracting technology by acid bath one-step method |
| 06/02/1999 | CN1218005A Method for preparation of potassium sulfate |
| 04/27/1999 | US5897848 Mixing sodium hypophosphite and nickel sulfate to produce sodium sulfate and nickel hypophosphite, separating nickel hypophosphite from waste stream containing sodium sulfate, cooling to crystallize out sodium sulfate, recycling waste |
| 04/21/1999 | CN1214272A Continuous stirring vacuum sodium sulfate crystallization technology |
| 04/14/1999 | CN1213645A Process for using hydrochloric acid mother liquor for mfg. lemery salt |
| 04/14/1999 | CN1042918C One-step method for preparing potassium sulfate |
| 04/14/1999 | CN1042917C Method for prepn. of potassium sulfate by sodium sulfate method |
| 04/08/1999 | WO1999016711A1 Single-stage gypsum bed process for producing potassium salts |
| 04/07/1999 | CN1212950A Method and apparatus for concentrating salt-containing solutions |
| 04/07/1999 | CN1042823C Method for preparation of lemery salt |
| 04/01/1999 | WO1998016462A9 Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed |
| 03/31/1999 | CN1042723C Method for preparing potassium sulphate |
| 03/31/1999 | CN1042722C Non-recovery process for producing potassium sulphate by Mannheim furnace |
| 03/31/1999 | CN1042720C Process for producing chlorine dioxide |
| 03/24/1999 | EP0903323A1 Process for producing hypophosphite compounds |
| 03/16/1999 | CA2108006C Metathesis of acidic by-product of chlorine dioxide generating process |
| 03/10/1999 | EP0687323B1 Zero discharge mill distillation, salt recovery, and water management |
| 03/03/1999 | CN1042320C Method for producing chlorine dioxide |
| 02/17/1999 | CN1208019A Liquid phase process producing ferric oxide, potassium sulfate and ammonium chloride |
| 02/16/1999 | US5871551 Process for the preparation of anhydrous sodium sulfate |
| 01/13/1999 | CN1204551A Producing chemical product by using sugar manufacturing equipment of sugar refinery |
| 01/13/1999 | CN1041619C Process for producing potassium sulfate by plaster stone conversion method |
| 01/12/1999 | CA2108629C Process of producing chlorine dioxide |
| 01/06/1999 | CN1203886A Method for producing hydrogen sulfide |
| 12/30/1998 | CN1041401C Method for producing potassium sulfate by neutral one-step process |
| 12/22/1998 | US5851374 Process for production of chlorine dioxide |
| 12/22/1998 | CA2178043C Method of producing chlorine dioxide |
| 12/09/1998 | EP0719359B1 Minimum adverse environmental impact pulp mill |
| 11/24/1998 | US5840085 Process for removing sodium chloride and potassium salts from ash collected from a soda recovery boiler |
| 11/04/1998 | CN1197764A Mulching mirabilite dewatering method |
| 10/27/1998 | CA2028550C Process for the production of chlorine dioxide |
| 10/27/1998 | CA2028549C Process for the production of chlorine dioxide |
| 10/14/1998 | CN1195564A Comprehensive utilization method of waste acid sludge |
| 10/01/1998 | DE19710157A1 Vaporising and solidifying salt=containing solution(s) |
| 10/01/1998 | DE19710151A1 Vaporising and solidifying salt=containing solution(s) |
| 09/16/1998 | EP0864535A2 Process and apparatus for evaporation of saline solutions |
| 09/09/1998 | EP0667835B1 Metathesis of acidic by-product of chlorine dioxide generating process |
| 09/01/1998 | CA2085203C Process for the preparation of anhydrous sodium sulfate |
| 08/19/1998 | EP0858429A1 Composition containing at least sodium bicarbonate, preparation method therefor and uses thereof |
| 08/19/1998 | EP0858428A1 Method for processing flue gases containing sulphur oxides |
| 08/11/1998 | US5792441 Fixed-resin bed technologies for the treatment of the chlorine dioxide generator effluent and feeds stream |
| 08/05/1998 | CN1189456A Tech. for prodn. of potassium sulfate |
| 07/22/1998 | CN1188076A Bittern comprehensive utilization method |
| 06/24/1998 | CN1038833C Method for prepn. of potassium sulphate |
| 06/18/1998 | WO1998018477A3 Pharmaceutical compositions containing lamivudine and zidovudine |
| 06/17/1998 | CN1184778A Method for catalytic prodn. of potassium sulfate using potassium hydroxide |
| 05/27/1998 | CN1038496C Method for preparing potassium sulfate by using salt-cake (gypsum) type bittern |
| 05/19/1998 | US5753200 Sodium metabisulfite process |
| 05/07/1998 | WO1998018477A2 Pharmaceutical compositions containing lamivudine and zidovudine |
| 05/07/1998 | CA2270174A1 Pharmaceutical compositions containing lamivudine and zidovudine |
| 05/05/1998 | CA2071810C Process for the production of chlorine dioxide |
| 04/29/1998 | CN1180047A Preparation method of lemery salt and ternary compound fertilizer containing nitrogen, phosphorus and potassium |
| 04/23/1998 | WO1998016462A1 Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed |
| 04/08/1998 | CN1178195A Production of crystal anhydrous sodium sulphate from nitrate containing brine |
| 04/08/1998 | CN1178194A Liquid phase one step crystallizing process for producing crystal sodium sulphate from nitrate containing brine |
| 04/07/1998 | US5735929 Potassium sulfate and potassium nitrate in combination with the surfactant selected from disulfonate and oxyalkylated alcohol-carboxylic acid adduct; used as a fertilizer |
| 03/11/1998 | EP0827487A1 Method for preparing a salt, particularly potassium chloride, by leaching and cooling a solution thereof |
| 02/18/1998 | CN1037428C Method for prodn. of potassium sulphate by double decomposition reaction of sodium suplhate and potassium chloride |
| 02/10/1998 | US5716419 Process for crystallization of mineral salts |
| 01/21/1998 | CN1170698A Technology for producing potassium sulfate using flue gas desulfating gypsum |
| 01/14/1998 | CN1169954A Co-production of potassium sulfate,sodium sulfate and sodium chloride |
| 12/31/1997 | CN1168861A CO-production of potassium sulfate and sodium sulfate |
| 12/30/1997 | CA2041914C Process for the recovery of sulphate |
| 12/24/1997 | CN1168350A Production process of agricultural potassium sulfate |
| 12/03/1997 | CN1036577C Process for prep. of potassium sulphate using benzene dilution method |
| 11/19/1997 | CN1165130A Method for preparing sulfonyl azophoska compound fertilizer |
| 11/04/1997 | US5683588 Stabilization of catalyzed aqueous sulfite and bisulfite ion solutions |
| 10/07/1997 | US5674466 Reduction of chlorate ion in alkali/sulfuric acid medium, aqueous neutralization of filtered, solid alkali sesquisulfate by-product, recirculating acidic filtrate |
| 10/01/1997 | CN1160677A Potassium sulfate producing process |
| 09/24/1997 | EP0796223A1 Co-production of potassium sulfate, sodium sulfate and sodium chloride |
| 09/24/1997 | EP0796222A1 Co-production of potassium sulfate and sodium sulfate |
| 09/10/1997 | CN1035811C Proces sfor preparation of potassium sulfate from bittern and potassium chloride |
| 09/09/1997 | US5665324 Producing hydroxyapatite |
| 08/27/1997 | CN1157809A Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride |
| 08/20/1997 | CN1157262A Process for producing lemery salt |