Regeneration of scale-coated activated carbon with acid wash
Patent 4169812 Issued on October 2, 1979. Estimated Expiration Date: 
March 7, 1998. 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.
March 7, 1998. 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 43748 239962 1502896 3260567 3528766 3927175 Process for producing sodium carbonate Patent #: 3933977 InventorsAssigneeApplicationNo. 05/884108 filed on 03/07/1978US Classes:502/26, Ammonia or derivative thereof423/206.2, Alkali carbonate from trona423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)502/516Metal contaminant removalExaminersPrimary: Douglas, Winston A.Assistant: Konopka, P. E. Attorney, Agent or FirmInternational ClassesC01B 31/00 (20060101)C01B 31/08 (20060101) C01D 7/00 (20060101) C01D 7/26 (20060101) AbstractA method for regenerating scale-coated activated carbon used to treat crude sodium carbonate solutions in which the scale-coated carbon is acid washed with an aqueous solution containing from 1 to 15% by weight hydrochloric acid and from 0.5 to 3% by weight ammonium bifluoride. |
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