PURIFICATION OF AQUEOUS SODIUM CHLORIDE SOLUTION

摘要

of the disclosure: Ah aqueous sodium chloride solution for use in production of caustic soda in an electrolytic cell using a cation exchange membrane is purified by adding a chemical reagent for precipitation separation of impurities to said solution to remove silica through co-precipitation with a slurry of the precipitates of impurities which are circulated through said solution to be co-present with the chemical reagent.