Process for producing sodium carbonate from complex brines
Patent 4291002 Issued on September 22, 1981. Estimated Expiration Date: 
September 22, 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.
September 22, 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 1865833 2693403 2962348 3028215 3188170 3717698 3900292 InventorsAssigneeApplicationNo. 05/844847 filed on 10/25/1977US Classes:423/189, Utilizing carbon dioxide as reactant423/190, Mixture contains metal chloride423/422, Hydrogen containing (bicarbonate)423/426, Densifying soda ash423/427By reacting a bicarbonateExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. Attorney, Agent or FirmInternational ClassC01D 7/00 (20060101)AbstractA process for the production of sodium carbonate wherein sodium bicarbonate is recovered from a brine containing sodium carbonate by carbonation of the brine under controlled conditions. The sodium bicarbonate is crystallized from the carbonated brine in a multi-stage carbonating, cooling and crystallization process after which it is filtered to produce wet cake. The wet cake is subjected to predrying to provide a predried wet cake of a specified free moisture content and mixed with recycle light ash to provide a dryer feed of specified moisture content to alleviate problems of product fouling or plugging of the dryer. The light ash from the dryer then is bleached and subjected to recrystallization, screening, centrifuging and drying to provide a dried sodium carbonate possessing, after evaporation of the water of hydration and free moisture, less than 0.10 percent moisture and chemical and physical properties meeting commercial dense ash specifications.Other References
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