Enhanced recovery of soda ash from aqueous sodium carbonate solutions containing Na2 SO4 - and NaCl
Patent 4519806 Issued on May 28, 1985. Estimated Expiration Date: 
November 26, 2002. 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.
November 26, 2002. 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 ReferencesInventorsAssigneeApplicationNo. 06/444640 filed on 11/26/1982US Classes:23/302T, Sodium compounds423/419.1, Carbonate or bicarbonate423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Richman, Barry S.Assistant: Carrier, Joseph P. Attorney, Agent or FirmInternational ClassesC01B 7/24 (20060101)C01B 7/00 (20060101) AbstractA method for enhancing the recovery of dense soda ash from Na2 SO4 - and NaCl-containing aqueous sodium carbonate solutions by first co-crystallizing anhydrous sodium carbonate and burkeite and next introducing the co-crystallized solids to an aqueous medium at elevated temperature to dissolve the burkeite and cause reversion of the anhydrous sodium carbonate solids to crystalline sodium carbonate monohydrate, which is then separated from the dissolved sulfate and recovered as product.Other References
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