Purification of crystallized solids made via continuous crystallization
Patent 4781899 Issued on November 1, 1988. Estimated Expiration Date: 
November 1, 2005. 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 1, 2005. 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 2798790 3131996 3260567 3273959 3425795 3594119 Production of sodium carbonate Process for producing soda ash from natural alkali metal carbonate-containing ores Multi-stage crystallization of sodium carbonate Process for the separation of insoluble materials in the production of soda ash InventorsAssigneeApplicationNo. 06/634939 filed on 07/27/1984US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassB01D 9/00 (20060101)AbstractCrystal solids made via the continuous crystallization of a crude, concentrated aqueous feed solution are recovered as a crystalline solid product that is relatively free of impurities present in the crystallizer liquor. A portion of the withdrawn crystallizer slurry is concentrated in a first hydroclone, diluted with crystallizer feed solution, concentrated in a second hydroclone, and centrifuged and dried to recover the crystalline solid product.Other References
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