Process for producing soda ash from natural alkali metal carbonate-containing ores
Patent 4158043 Issued on June 12, 1979. Estimated Expiration Date: 
January 18, 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.
January 18, 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 References3653848 InventorAssigneeApplicationNo. 05/870580 filed on 01/18/1978US Classes:423/206.2, Alkali carbonate from trona23/302TSodium compoundsExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. International ClassC01D 7/00 (20060101)AbstractDescribed herein is a process for producing soda ash (sodium carbonate) from natural ores such as trona in which separate soda ash products are produced having differing purities. According to the invention, a substantially purified and saturated solution of sodium carbonate is divided into at least two separate process streams, one of which is subjected to crystallization in the absence of recycled mother liquor to form high purity sodium carbonate-containing crystals, while the other stream is subjected to crystallization in the presence of recycled mother liquor to form lower purity crystals. The crystals are thereafter separately processed to obtain soda ash products of differing grades.Field of SearchCarbonating |
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