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| Number | Title | Issue Date |
| 7901644 | Catalytic gasification process with recovery of alkali metal from char Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of ins... | 03/08/2011 |
| 7897126 | Catalytic gasification process with recovery of alkali metal from char Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of ins... | 03/01/2011 |
| 6699447 | Sodium bicarbonate production from nahcolite A method for producing sodium bicarbonate from a nahcolite deposit comprising injecting water or other aqueous solution at a temperature of at least 250° F. into the deposit, dissolving sodium bicarbonate in the hot water to form a production solution an... | 03/02/2004 |
| 5607549 | Method for the manufacture of cooking liquors of different sulphidity by green liquor crystallization Cooking liquors of significantly different sulphidity (e.g. one having a sulphidity about 30-40% and the other a sulphidity of above 40%, e.g. about 60-70%) may be produced in a simple energy-efficient manner. Black liquor is treated to recover chemicals,... | 03/04/1997 |
| 5268154 | Process for disaggregating boronatrocalcite ore in an alkaline medium for the production of sodium borate and calcium borate A process for disaggregating boronatrocalcite ore (Ulexite) in an alkaline aqueous medium for the production of sodium borate and calcium borate, characterized in that boronatrocalcite is dispersed in alkaline mother liquor having a H3 BO3... | 12/07/1993 |
| 4288419 | Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions A method for enhancing recovery of sodium carbonate from sodium carbonate solutions which contain sodium chloride. Anhydrous sodium carbonate is recovered in good yields from aqueous sodium carbonate solutions containing sodium chloride by evaporative cry... | 09/08/1981 |
| 4252781 | Preparation of sodium carbonate anhydride A thick suspension of sodium carbonate anhydride is obtained by countercurrent contacting of a high pressure steam and a suspension of sodium bicarbonate or sodium sesquicarbonate in a concentrated solution of sodium carbonate. The decomposition reaction ... | 02/24/1981 |
| 4127989 | Method for separating metal values from brine A process for separating and recovering metal values and salts from brine, such as brine produced from a subterranean geothermal reservoir, in which the brine is pressurized to above the bubble point pressure and thereafter a precipitating agent, such as ... | 12/05/1978 |
| 4026676 | Process for producing salt having a reduced calcium sulfate content A process for preparing from aqueous NaCl brine containing appreciable quantities of dissolved calcium sulfate high purity dendritic salt, characterized by an exceptionally low calcium sulfate content. The process is carried out by a "feed and bleed" proc... | 05/31/1977 |
| 3941667 | Method for the reprocessing of cell liquor from diaphragm cell electrolysis plants A method for the reprocessing of cell liquor from diaphragm cell electrolysis plants that operate on potassium chloride brine. The cell liquor is contacted with an SO2 -bearing gas, and the effluent solution is oxidized with an oxygen-bearing g... | 03/02/1976 |
