Carbon treatment of monohydrate crystallizer liquor
Patent 4299799 Issued on November 10, 1981. Estimated Expiration Date: 
April 9, 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 9, 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 2770524 3260567 3528766 3725014 3927175 Process for producing sodium carbonate Treatment of sodium carbonate crystallizer mother liquors Patent #: 4039618 InventorsAssigneeApplicationNo. 06/138484 filed on 04/09/1980US 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 ClassesC01D 7/00 (20060101)C01D 7/12 (20060101) AbstractImproved process for preparing sodium carbonate from crude trona without carbon column scaling by evaporating a portion of water from a clarified sodium carbonate solution to crystallize sodium carbonate crystals therefrom, separating the sodium carbonate crystals from the crystallizer liquor, passing only the crystallizer liquor which contains organic impurities through a carbon column to reduce the organic impurity concentration therein, and evaporating a portion of water from the carbon treated crystallizer liquor to crystallize additional sodium carbonate crystals.Field of SearchCarbonatingUtilizing carbon dioxide as reactant Subjecting mixture to pressure, vacuum, or steam Mixture contains metal chloride Subjecting mixture to pressure, vacuum, or steam Subjecting mixture to pressure, vacuum, or steam Leaching or forming water soluble substance Alkali metal containing (Li, Na, K, Rb, or Cs) |
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