Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions
Patent 4288419 Issued on September 8, 1981. Estimated Expiration Date: 
April 4, 2000. Estimated 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.
April 4, 2000. Estimated 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.Patent References 1907987 2024187 2133455 3184287 3264057 3273959 3425795 3451767 3656892 InventorsAssigneeApplicationNo. 06/137209 filed on 04/04/1980US Classes:423/190, Mixture contains metal chloride23/302T, Sodium compounds299/5, Dissolving or chemical reaction423/195, Subjecting mixture to pressure, vacuum, or steam423/206.2, Alkali carbonate from trona423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassesC01D 7/00 (20060101)C01D 7/24 (20060101) AbstractA 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 crystallization at superatmospheric pressure and at a temperature of at least about 120° C. |
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