Ion exchange removal of impurities from chlorate process liquors
Patent 5104500 Issued on April 14, 1992. Estimated Expiration Date: 
April 30, 2010. 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.
April 30, 2010. 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 ReferencesProcess for the electrolysis of an aqueous sodium chloride solution comprising, in combination, a diaphragm process and a cation exchange membrane process Process for the production of sodium chlorate Production of sodium chlorate Process for the production of alkali metal chlorate Patent #: 4888099 InventorAssigneeApplicationNo. 516397 filed on 04/30/1990US Classes:205/503, Alkali metal containing210/687Calcium or magnesium (e.g., hardness, water softening, etc.)ExaminersPrimary: Niebling, John F.Assistant: Ryser, David G. Attorney, Agent or FirmInternational ClassesC25B 001/26B01J 039/00 AbstractDisclosed is an improved method of operating a sodium chlorate crystal production system where a brine stream is electrolyzed to form sodium chlorate, the sodium chlorate is crystallized in a crystallizer, and the mother liquor from a crystallizer is recycled to the brine stream. The improvement comprises passing the mother liquor through a cationic chelating ion exchange column before it is returned to the brine stream, and operating the ion exchange column so that it removes, on the average, only the amount of calcium that enters the system in the brine stream.Other References
Field of SearchCalcium or magnesium (e.g., hardness, water softening, etc.) |
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