Ion exchange removal of impurities from chlorate process liquors

Details Ion exchange removal of impurities from chlorate process liquors Ion exchange removal of impurities from chlorate process liquors

1990-04-30

1992-04-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 94, 204 95, 210687, C25B 126, B01J 3900

Patent

active

051045001

ABSTRACT:
Disclosed 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.

REFERENCES:
patent: 4374711 (1983-02-01), Ogawa
patent: 4405418 (1983-09-01), Takemura
patent: 4702805 (1987-10-01), Burkell et al.
patent: 4888099 (1989-12-01), Welander et al.
Wolff, "Ion Exchange Purification of Feed Brine for Chlor-Alkali Electrolysis Cells, The Role of Duolite C-467"; pp. 1-12.

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