| Patents for C01D 5 - Sulfates or sulfites of sodium, potassium, or alkali metals in general (1,848) |
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| 12/25/1991 | CN1015162B Process for purifying potassium sulfate |
| 12/21/1991 | WO1991019668A1 Methanol-based chlorine dioxide process |
| 12/20/1991 | CA2019389A1 Methanol-based chlorine dioxide process |
| 11/13/1991 | CN1014695B Process for producing safety powder by zinc method and method for recovering sodium sulfite and common salt from waste liguor |
| 10/23/1991 | EP0452863A2 Process for treating wastes from waste waters obtained from the production of dyes |
| 10/22/1991 | CA1290920C Production of useful materials including synthetic nepheline from bayer red mud |
| 10/17/1991 | DE4111718A1 Prepn. of potassium sulphate and hydrochloric acid - by reacting sulphuric acid, potassium chloride and hydrochloric acid soln. of potassium salts, then adding water and methanol |
| 10/11/1991 | CA2040109A1 Process for producing potassium sulfate and hydrochloric acid |
| 09/18/1991 | CN1013973B Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 09/11/1991 | EP0445493A1 Process for production of chlorine dioxide |
| 08/20/1991 | US5041237 Aqueous solution containing sulphur dioxide and sodium in high percentages, its manufacture and use |
| 07/10/1991 | CN1013100B Method of making potassium sulfate |
| 06/20/1991 | DE3941592A1 Sodium sulphate sepn. from spent flue gas desulphurisation soln. - by modifying evapn. and crystallisation to minimise chemical and energy consumption |
| 06/12/1991 | CN1052092A Process for comprehensive utilization of acid dregs |
| 06/04/1991 | US5021231 Recycling; utilizes spent sulfuric acid; sulfur dioxide contamination limited |
| 05/02/1991 | EP0425131A1 Recovery of IDA and glauber's salt from waste crystal liquors |
| 04/30/1991 | US5011988 Separation Of Iminodiacetic Acid And Sodium Sulfate Decahydrate By Cooling And Crystallization |
| 03/20/1991 | CN1012058B Method for preparing potassium sulfate by using mixed salt and potassium chloride |
| 02/07/1991 | WO1990015038A3 Process for binding dust in fertilizer granules |
| 01/22/1991 | US4986976 Recovery of glycine and glauber's salt from waste crystal liquors |
| 01/09/1991 | CN1048378A Process for production of potassium nitrate, potassium dihydrogen phosphate, potassium sulfate |
| 12/13/1990 | DE3918523A1 Verfahren zur staubbindung in duenger-granulaten A method for binding dust in fertilizer granules |
| 12/12/1990 | CN1010769B Method of producing potassium salts using tobacco vein as raw material |
| 12/08/1990 | WO1990015038A2 Process for binding dust in fertilizer granules |
| 12/05/1990 | CN1010675B Method of preparation of soft potassium-magnesium alum by solid phase reaction |
| 11/26/1990 | CA2017024A1 Process for manufacturing granular substances using vaporous reactant, and for cleaning impure acid |
| 11/07/1990 | EP0395740A1 Process for purifying aqueous buffer solutions. |
| 11/06/1990 | US4968503 Using sodium bisulfate formed as waste in production of chromic oxide |
| 10/30/1990 | US4966710 Method for removing magnesium and calcium from sodium sulfate solutions |
| 10/24/1990 | CN1046313A Process of improvement of saltcake quality |
| 10/17/1990 | EP0392823A2 Recovery of glycine and Glauber's salt from waste crystal liquors |
| 10/03/1990 | CN1045755A Extracting potassium sulphate from ore |
| 09/19/1990 | CN1045378A Process for purifying raw sylvite as primary product of alunite |
| 08/28/1990 | US4952378 Method for neutralization treatment of sulfuric acid containing iron ions |
| 07/11/1990 | CN1043767A Water dissolving exploit technology for mining glauberite |
| 04/17/1990 | US4917874 Desulfurization process |
| 04/11/1990 | CN1041143A Prodn method of sodium dithionite with improved purity and granularity |
| 03/22/1990 | DE3831305A1 Process for the preparation of crystals from solutions, in particular salt solutions, such as for example potassium salt solutions, by cold crystallisation |
| 03/08/1990 | WO1990002097A1 Compacts of spray dried water soluble compounds |
| 02/28/1990 | CN1040012A Treatment for waste liquor of safety powder and recovery of sodium sulfate and common salt |
| 02/21/1990 | CN1039778A Method of making and extracting sodium dihydrogen phosphate salt of lemery |
| 01/17/1990 | CN1038799A Method of preparation of soft potassium-magnesium alum by solid phase reaction |
| 01/03/1990 | CN1006298B Method of making schoenite or mixture of schoenite and potassium chloride |
| 12/27/1989 | CN1038252A Prepn. of high grade picromerite by cold/hot process |
| 12/19/1989 | CA1263908A1 Method of removing sulphur dioxide from a gaseous stream |
| 11/29/1989 | CN1037495A Process for producing na dichromate |
| 11/29/1989 | CN1037492A Method for preparing potassium sulfate by using mixed salt and potassium chloride |
| 11/14/1989 | CA1262812A1 Procedure for the production of potassium sulfate from potassium chloride by means of ion exchangers |
| 11/08/1989 | EP0340585A2 Process for the preparation of sodium bichromate |
| 10/10/1989 | US4873084 Insecticidal composition |
| 09/19/1989 | US4867961 Absorption by magnesium oxide slurry, reaction with sulfuric acid |
| 09/08/1989 | WO1989007973A1 Process for purifying aqueous buffer solutions |
| 09/06/1989 | CN1035271A Preparation for whitening sodium sulfate |
| 08/23/1989 | CN1034907A Method of producing potassium salts using tobacco vein as raw material |
| 08/23/1989 | CN1034906A Method of making potassium sulfate |
| 07/04/1989 | US4844880 Process for the manufacture of sodium metabisulfite |
| 06/06/1989 | US4837001 Absorption on sodium sulfite; reacting with sodium bicarbonate; slurrying; reduction to hydrogen sulfur and sulfur |
| 06/06/1989 | CA1255058A1 Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 05/30/1989 | US4834959 Process for selectively removing sulfur dioxide |
| 04/20/1989 | WO1989003364A1 Method of reforming soluble salts to effect purification and increase crystal size thereof |
| 04/13/1989 | DE3732661A1 Process for recovering ammonium sulphate and sodium sulphate from aqueous solutions |
| 03/07/1989 | US4810682 Production of useful materials including synthetic nepheline from Bayer red mud |
| 02/01/1989 | EP0301700A1 Neutralization of sulfuric acid containing iron ions |
| 01/19/1989 | DE3723292A1 Process for preparing sodium hydrogen sulphate |
| 01/05/1989 | DE3721667A1 Process for preparing sodium sulphate |
| 12/28/1988 | CA1247328A Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby |
| 10/12/1988 | CN85100516B Manufacture technology of upgraded ammonium bicarbonate by phosphate addition |
| 09/15/1988 | DE3707406A1 Process for preparing potassium sulphate |
| 05/11/1988 | EP0266599A2 Process for preparing magnesium sulphates |
| 04/05/1988 | US4735683 Process for preparation of potassium salts from pulp of lignocellulosic materials |
| 02/10/1988 | CN87105366A Granular potassium sulfate and process for producing the same |
| 02/10/1988 | CN86104945A Production method of hydroxides, thiosulfates, sulfates and sulfur |
| 02/09/1988 | US4724132 Cross-pipe reactor to provide extreme mixing and agitation |
| 01/26/1988 | CA1231968A1 Process for isolating paraffinsulfonates and sulfuric acid of low alkali metal sulfate content from paraffinsulfoxidation reaction mixtures |
| 01/21/1988 | DE3623104A1 Process for granulating potassium sulphate |
| 01/07/1988 | EP0251426A2 Selective removal of nitrate ions from salt solutions |
| 11/25/1987 | EP0246403A1 Production of sulfur from sulfur dioxide obtained from flue gas |
| 11/25/1987 | CN87103934A Method of making schoenite or mixture of schoenite and potassium chloride |
| 11/24/1987 | CA1229454A1 Aqueous solution containing sulphur dioxide and sodium in high percentages, its manufacture and use |
| 11/17/1987 | US4707347 Process for the production of potassium sulfate from potassium chloride by means of ion exchangers |
| 08/11/1987 | US4686097 Process for the removal of the residual sulfuric acid from the reaction mixture produced in the sulfoxidation of paraffins |
| 08/05/1987 | EP0230757A1 Process and apparatus for the production of sodium hydrosulfite |
| 07/14/1987 | US4680136 Method for preparing compositions which can be used in the production of sodium dithionite; and the use of such compositions |
| 05/26/1987 | US4668242 Process for producing granulated potassium sulphate and potassium magnesium sulphates, and the granulates obtained thereby |
| 02/25/1987 | CN86104368A Process for preparation of potassium salts from pulping of lignocellulosic materials |
| 01/27/1987 | CA1217028A1 Method for the production of potassium sulfate using sulfuric acid and potassium chloride |
| 01/27/1987 | CA1217027A1 Process for producing and decomposing syngenite for producing k.sub.3h(so.sub.4).sub.2 crystals and potassium sulfate crystals, and for producing potassium nitrate |
| 01/27/1987 | CA1217026A1 Process and composition for crystallizing potassium sulfate |
| 01/24/1987 | CN85101506A Process for removing the residual sulfuric acid from the reaction mixture produced in sulfoxidation of alkanes |
| 01/13/1987 | US4636289 Multicompartment, direct current |
| 12/31/1986 | CN85103968A Granular potassium sulfate and process for producing same |
| 12/03/1986 | CN85104680A Allied process of producing anhydrous na2so3 and na2so4 |
| 11/20/1986 | EP0202210A2 A method for preparing compositions which can be used in the production of sodium dithionite, and the use of such compositions |
| 11/19/1986 | CN85104005A Dry process for neutralizing potassium sulfate produced from potassium chloride and sulfuric acid |
| 10/29/1986 | EP0199104A2 The production of potassium sulphate |
| 10/21/1986 | US4618480 Recovery of alumina values from alunite ore |
| 09/16/1986 | CA1211318A1 Method for treating potash with anticaking agent |
| 09/16/1986 | CA1211273A1 Flowing melt layer process for production of sulfides |
| 07/02/1986 | CN85100516A Manufacture technology of upgraded ammonium bicarbonate by phosphate addition |
| 05/13/1986 | US4588573 Using recycled aqueous solution; potassium bisulfate production minimized |