Process for the separation of insoluble materials in the production of soda ash
Patent 4202667 Issued on May 13, 1980. Estimated Expiration Date: 
August 16, 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.
August 16, 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 3479134 3840120 Production of sodium carbonate Patent #: 4021527 InventorsAssigneeApplicationNo. 05/934020 filed on 08/16/1978US Classes:23/302T, Sodium compounds423/206.2Alkali carbonate from tronaExaminersPrimary: Bernstein, Hiram H.Attorney, Agent or FirmInternational ClassesC01D 7/00 (20060101)C01D 7/12 (20060101) C01D 7/37 (20060101) AbstractAn improved process for the production of soda ash from trona including the steps of sizing the trona, heating the trona to eliminate water and carbon dioxide therefrom, dissolving the trona in an aqueous medium to obtain a solution thereof, removing insoluble solid materials from the solution, crystallizing sodium carbonate monohydrate from the solution, and heating the crystallized sodium carbonate monohydrate to produce soda ash. The improvement of the invention comprises the step of removing insoluble solid materials from the solution of trona by classifying the insoluble solid materials in a plurality of hydroclones.Other References
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