Process for producing sodium salts from brines of sodium ores
Patent 5262134 Issued on November 16, 1993. Estimated Expiration Date: 
February 21, 2012. 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.
February 21, 2012. 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 ReferencesInventorsAssigneeApplicationNo. 839641 filed on 02/21/1992US Classes:423/184, Forming insoluble substance in liquid23/302T, Sodium compounds423/206.2, Alkali carbonate from trona423/427By reacting a bicarbonateExaminersPrimary: Brunsman, DavidAttorney, Agent or FirmInternational ClassC01D 007/12AbstractA process is described for producing sodium-based chemicals from a brine containing sodium carbonate and sodium bicarbonate by heating the brine to evaporate water and drive off carbon dioxide and obtain a solution that will crystallize sodium sesquicarbonate, cooling the solution, precipitating sodium sesquicarbonate crystals and separating a first mother liquor from the sesquicarbonate crystals. The first mother liquor is then cooled to a lower temperature to precipitate sodium carbonate decahydrate crystals, the decahydrate crystals are separated from a second mother liquor and the decahydrate crystals are recovered for use in the manufacture of sodium-containing chemicals, such as sodium carbonate monohydrate, anhydrous sodium carbonate or soda ash.Other References
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