Sodium carbonate (soda ash) crystal modification
Patent 4472280 Issued on September 18, 1984. Estimated Expiration Date: 
October 6, 2003. 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.
October 6, 2003. 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 3259471 3300406 3528766 Purification of carbonate process solutions Polymers for controlling soda ash crystal formation Patent #: 4374102 InventorApplicationNo. 06/539494 filed on 10/06/1983US Classes:210/666, Utilizing organic agent210/669, Prior to ion exchange or sorption210/691, From aqueous material210/694, Utilizing activated carbon423/206.2Alkali carbonate from tronaExaminersPrimary: Cintins, IvarsAttorney, Agent or FirmInternational ClassesC01D 7/14 (20060101)C01D 7/00 (20060101) C01D 7/22 (20060101) AbstractThe invention comprises a method of removing anionic polymers and acidic organic impurities from aqueous trona solutions prior to crystallization whereby improved crystal formation is achieved which comprises treating such solutions with at least one nitrogen containing cationic compound consisting of water-soluble cationic polymers and fatty substituted quaternary ammonium salts followed by a solid adsorbant from the group consisting of clays and activated carbon. |
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