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US Patent 6228335 - Process for the production of sodium carbonate crystals
US Patent Issued on May 8, 2001
Estimated Patent Expiration Date:
December 10, 2017Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
December 10, 2017Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping CO2 gas from the withdrawn aqueous mining solution, to convert sodium bicarbonate dissolved therein to sodium carbonate; co-crystallizing sodium carbonate monohydrate and sodium sesquicarbonate by evaporation of water from the CO2 -stripped aqueous mining solution, without co-crystallization of anhydrous sodium carbonate, to form a slurry of crystalline solids in an aqueous liquor; recovering crystalline solids from the slurry; and calcining the recovered crystalline solids to produce soda ash. | InventorsAssigneeApplicationNo. 987978 filed on 12/10/1997US Classes:423/206.2, Alkali carbonate from trona423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/426Densifying soda ashField of Search423/206.2, Alkali carbonate from trona423/206.1, Mixture contains organic or carbonaceous impurity423/426, Densifying soda ash423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)23/302T, Sodium compounds23/297, With extraction23/298, From natural sources299/4, Input and output wells299/5Dissolving or chemical reactionExaminersPrimary: Bos, StevenAttorney, Agent or FirmUS Patent References2133455, 2267136, 2388009, 2625384, 3050290, 3113834, 3119655, 3184287, 3246962, 3264057, 3273958, 3273959, 3451767, 3953073, Process for the solution mining of subterranean sodium bicarbonate bearing ore bodiesIssued on: 04/27/1976 Inventor: Kube4252781, Preparation of sodium carbonate anhydride Issued on: 02/24/1981 Inventor: Fujita , et al.4283372, Recovery of alkali values from sodium bicarbonate-containing ore with ammonia Issued on: 08/11/1981 Inventor: Frint , et al.4288419, Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions Issued on: 09/08/1981 Inventor: Copenhafer , et al.4519806, Enhanced recovery of soda ash from aqueous sodium carbonate solutions containing Na2 SO4 - and NaCl Issued on: 05/28/1985 Inventor: Copenhafer , et al.4557910, Production of soda ash from nahcolite Issued on: 12/10/1985 Inventor: Meadow4652054, Solution mining of trona or nahcolite ore with electrodialytically-produced aqueous sodium hydroxide Issued on: 03/24/1987 Inventor: Copenhafer , et al.4654204, Production of sodium bicarbonate by reversion of soda-type feed salt Issued on: 03/31/1987 Inventor: Copenhafer , et al.4869882, Recovery of sodium carbonate values from contaminated dilute soda ash streams Issued on: 09/26/1989 Inventor: Dome , et al.5043149, Soda ash production Issued on: 08/27/1991 Inventor: Frint, et al.5262134, Process for producing sodium salts from brines of sodium ores Issued on: 11/16/1993 Inventor: Frint, et al.5283054, Process for producing sodium salts from brines of sodium ores Issued on: 02/01/1994 Inventor: Copenhafer, et al.5396863, Installation and process for the crystallization of an inorganic substance and process and installation for the crystallization of sodium carbonate monohydrate Issued on: 03/14/1995 Inventor: Ninane, et al.5609838, Equilibrium production of sodium carbonate from sodium bicarbonate Issued on: 03/11/1997 Inventor: Neuman, et al.5618504, Method for recovery of alkali values from trona using sequential crystallization Issued on: 04/08/1997 Inventor: Delling, et al.5766270Solution mining of carbonate/bicarbonate deposits to produce soda ash Issued on: 06/16/1998 Inventor: Neuman, et al. International ClassesC01D 007/00C22B 026/00 |
