Production of soda ash from nahcolite
Patent 4557910 Issued on December 10, 1985. Estimated Expiration Date: 
December 10, 2002. 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.
December 10, 2002. 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 ReferencesInventorAssigneeApplicationNo. 06/362826 filed on 03/29/1982US Classes:423/206.2, Alkali carbonate from trona423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/427By reacting a bicarbonateExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassesC01D 7/00 (20060101)C01D 7/12 (20060101) AbstractSoda ash is prepared from dry-mined nahcolite ore by partially calcining the ore, dissolving the ore in aqueous solution, separating the resultant solution from the ore insolubles, crystallizing anhydrous sodium carbonate or sodium carbonate monohydrate, and recovering the crystallized sodium carbonate. |
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