Production of sodium carbonate
Patent 4021527 Issued on May 3, 1977. Estimated Expiration Date: 
May 3, 1994. 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.
May 3, 1994. 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 2346140 2770524 2962348 2989369 3260567 3455647 3528766 3927175 Process for producing sodium carbonate Patent #: 3933977 InventorApplicationNo. 05/596484 filed on 07/16/1975US Classes:423/206.2, Alkali carbonate from trona210/661, By passing through suspended bed23/302TSodium compoundsExaminersPrimary: Vertiz, O. R.Assistant: Straub, Gary P. Attorney, Agent or FirmAbstractMethod of preparing refined, dense soda ash from crude trona by calcining the crude trona to crude sodium carbonate, mixing the crude sodium carbonate with an aqueous solution of soda ash or water to form a substantially saturated crude sodium carbonate solution containing coarse and fine insolubles, clarifying the crude sodium carbonate solution, passing the clarified sodium carbonate solution upwardly through an expanded carbon bed to remove organic impurities, evaporating the carbon-treated sodium carbonate solution to crystallize sodium carbonate monohydrate crystals, separating the sodium carbonate monohydrate crystals and calcining them to dense soda ash.Field of SearchAlkali metal containing (Li, Na, K, Rb, or Cs) |
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