| Patents for C01D 1 - Oxides or hydroxides of sodium, potassium, or alkali metals in general (1,372) |
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| 06/24/1993 | CA2125695A1 Process for producing a carbonate composition |
| 06/15/1993 | US5219541 Sodium hydroxide production with a calcium carbonate seed crystal |
| 06/09/1993 | CN1072906A Ion-exchange causticization process for preparing caustic soda |
| 05/04/1993 | US5207879 Electrodialysis |
| 04/27/1993 | US5205493 Process for producing a carbonate composition |
| 04/01/1993 | WO1993006298A1 A method of producing sodium hydroxide |
| 03/17/1993 | CA2076491A1 Corrosion suppression of stainless steel caustic soda |
| 03/04/1993 | WO1993004000A1 Production of sodium hydroxide |
| 03/04/1993 | WO1993003999A1 Method for safely reacting active metals |
| 02/16/1993 | US5186794 Solar radiation heating of solution for electrolysis of aqueous alkali halide which also yields hydrogen and halogen gas; solar cells |
| 02/03/1993 | CN1068547A One step caustic soda preparing process by gas reduction of mirabilite |
| 11/10/1992 | US5162076 Electrodialysis |
| 10/14/1992 | CN1065254A Technology for small-size production of caustic soda |
| 10/14/1992 | CN1018625B Making method of sodium hydroxide |
| 10/13/1992 | US5154860 Addition of sodium borohidride or in combination with hydrazine forms a protective film over electrode to stop iron to enter in caustic soda electrolyte solution while performing electrolysis |
| 09/30/1992 | CN1064849A Heat chemical process for manufacturing chlorine and alkali with enclosed circulation |
| 09/15/1992 | US5147460 Internal coating materials for a cathode ray tube |
| 08/26/1992 | CN2114126U Internal-heating gas salt bath furnace |
| 08/25/1992 | US5141610 Continuous separation by adding soluble acid salt and using cation permeable membrane |
| 08/19/1992 | CN1063662A Sodium hydrate preparing method using barium salt and sodium sulfate as material |
| 08/04/1992 | US5135626 Apparatus having a catinic membrane between two bipolar membranes |
| 07/29/1992 | EP0496468A1 Multistage countercurrent recrystallization process and apparatus for performing same |
| 07/23/1992 | DE4101333A1 Reducing toxicity of alkaline soln. contg. halogenate and halide - by converting halogenate to halide, useful for epitaxial prodn. of semiconductors |
| 06/24/1992 | CN1017136B Process for producing caustic sode by compound causticization |
| 06/24/1992 | CN1017135B Method for producing sodium hydroxide |
| 06/23/1992 | US5124012 Process for the desalination of sea and for obtaining energy and the raw materials contained in sea water |
| 06/02/1992 | US5118399 Electrodialytic recovery process |
| 05/27/1992 | CN2105485U Causticizing reactor for preparing alkaline |
| 05/13/1992 | EP0484829A1 Layered mixed metal hydroxides made in non-aqueous media |
| 05/07/1992 | CA2054937A1 Layered mixed metal hydroxides made in non-aqueous media |
| 04/02/1992 | WO1992005108A1 Alkali metal hydroxide generation system and the method therefor |
| 02/12/1992 | CN1015434B Method for production of caustic soda |
| 02/05/1992 | EP0468981A1 A process and device for desalinating sea water and for obtaining power and the raw materials contained in sea water |
| 01/28/1992 | US5084209 Mixing alkoxide salts and hydrolyzing, gelation |
| 01/15/1992 | EP0465822A1 Recovery of sodium hydroxide and aluminium hydroxide from etching waste |
| 01/07/1992 | CA2043717A1 Recovery of sodium hydroxide and aluminum hydroxide from etching waste |
| 12/04/1991 | CN1056669A Process and apparatus for desalting of sea and obtaining of energy and materials contained in sea |
| 11/27/1991 | EP0458504A2 Internal coating materials for a cathode ray tube |
| 11/19/1991 | US5066404 Purification using titania hydrate |
| 11/13/1991 | CN1014679B Method to substitute silver in the alkali evaporator |
| 10/16/1991 | CN1055345A Technological process for preparation of sodium hydroxide |
| 09/27/1991 | CA2020501A1 Process for the production of metal-oxide aerosols for fuel emissions control |
| 09/25/1991 | CN1014044B Preparation method of caustic soda from sodium bicarbonate |
| 09/18/1991 | EP0446296A1 Method for purification of bases from materials comprising base and salt. |
| 09/17/1991 | US5049233 Recovery of sodium hydroxide and aluminum hydroxide from etching waste |
| 09/04/1991 | CN1054234A Process for preparation of carbonates of alkali metals |
| 08/08/1991 | CA2009616A1 Method of producing carbonic acid salts of alkali metals |
| 08/07/1991 | EP0439636A1 Alkali metal (hydrogen) carbonate production process |
| 07/02/1991 | CA1285353C Process for the preparation of sulphide-free alkali liquor |
| 06/12/1991 | CN1052097A Liquid-phase circulating substitution process for preparing alkali from mirabilite |
| 05/29/1991 | CN1051712A New process for producing caustic soda from mirabilite |
| 05/08/1991 | EP0426649A1 Process for the stepwise electrodialysis of alkali sulfate-containing aqueous solutions and apparatus for carrying out the process |
| 04/17/1991 | EP0404788A4 Metallic surface protection |
| 03/20/1991 | CN1050056A Process for manufacture of sodium hydroxide lye |
| 03/13/1991 | CN1049874A Process for manufacture of sodium hydroxide lye |
| 03/13/1991 | CN1049831A Manufacturing process of caustic soda by use of ionization-causticizing method of trona and its equipment |
| 02/20/1991 | EP0413385A1 Process for manufacturing a sodium hydroxide caustic solution |
| 02/20/1991 | EP0413384A1 Process for manufacturing a sodium hydoxide caustic solution |
| 02/18/1991 | CA2023412A1 Production process for sodium hydroxide lye |
| 02/18/1991 | CA2023411A1 Production process for sodium hydroxide lye |
| 02/13/1991 | CN1049139A Making method of sodium, potassium, barium hydroxide |
| 01/02/1991 | EP0404788A1 Metallic surface protection |
| 01/02/1991 | CA1278417C Process for manufacture of metal oxide |
| 01/01/1991 | US4981556 Papermaking |
| 12/11/1990 | US4976838 Method for purification of bases from materials comprising base and salt |
| 11/21/1990 | CN1047068A Process for making sodium hydroxide from mirabilite |
| 11/07/1990 | CN1046722A Process for producing caustic soda by causticizing method |
| 10/30/1990 | US4966710 Method for removing magnesium and calcium from sodium sulfate solutions |
| 10/20/1990 | WO1990012758A1 A process and device for desalinating sea water and for obtaining power and the raw materials contained in sea water |
| 10/20/1990 | CA2053263A1 Process and device for the desalination of sea water and for obtaining energy and the raw materials contained in sea water |
| 10/17/1990 | CN1046141A Manufacturing process of caustic soda by using of mirabilite heating method |
| 09/26/1990 | CN1045567A Improved preparation of sodiu hydroxide with custicization |
| 09/05/1990 | CN1045082A Optimizing combination process for producing caustic soda |
| 08/29/1990 | CN1044931A Continuous prodn of soda from mirabilite by means of one-step method |
| 07/11/1990 | CN1043684A Process and dedicated reactor for preparing caustic soda by compound causticization |
| 07/11/1990 | CN1043683A Process for preparing caustic soda from sea water |
| 06/27/1990 | CN1043295A Combined technology for producing caustic potash |
| 06/27/1990 | CN1043294A Technological routine for converting mirabilite into caustic soda |
| 06/20/1990 | CN1043089A Method for purification of acids from materials comprising acid and salt |
| 06/14/1990 | WO1990006168A1 Method for purification of acids from materials comprising acid and salt |
| 06/14/1990 | WO1990006167A1 Method for purification of bases from materials comprising base and salt |
| 05/29/1990 | CA1269503A1 Method of recovering alkali chemicals from flue gases containing alkaline metal vapor |
| 05/22/1990 | US4927494 Apparatus for preparing high-concentration alkali |
| 05/16/1990 | CN1042133A Combination process for producing caustic soda |
| 04/17/1990 | US4917763 Method of recovering chemical from spent pulp liquors |
| 03/28/1990 | EP0261116B1 Method of recovering alkaline chemicals from flue gases containing alkaline metal vapor |
| 03/14/1990 | CN1007148B Method and equipment for preparing high concn. alkali |
| 02/28/1990 | CN1040010A Cyctic method for producing caustic soda |
| 02/21/1990 | CN1039780A Method of caustic soda made by trona |
| 01/23/1990 | CA1264506A1 Method of recovering chemicals from spent pulp liquors |
| 01/16/1990 | US4894217 Process for causticizing of an aqueous solution containing alkali carbonate |
| 01/03/1990 | CN1038440A Production of caustic soda via conversion of sodium chloride |
| 11/29/1989 | EP0343712A1 Method for inhibiting corrosion of caustic evaporators via use of catalized hydroquinone |
| 11/22/1989 | CN1037319A Comprehensive utilization method of trona |
| 10/25/1989 | EP0338719A1 A process for the separation of sodium and calcium from sodium sludge |
| 09/21/1989 | WO1989008728A1 Metallic surface protection |
| 08/29/1989 | US4861572 Process for manufacture of metal oxide |
| 08/23/1989 | CN1034866A Method to substitute silver in the alkali evaporator |
| 08/08/1989 | US4855123 With oxygen using specific activated carbon catalyst |
| 08/03/1989 | DE3801382A1 Process and plant for converting sodium sulphate into sodium hydroxide |