Method for separating and regenerating anion exchange resin and cation exchange resin in mixed ion exchange resin

Abstract

A second NaOH aqueous solution used in an anion exchange resin regeneration tower (4) is recovered and used as a first NaOH aqueous solution for separating a cation exchange resin mixed in the anion exchange resin by means of a concentrated alkali specific gravity separation tower (3), whereby the amount of NaOH aqueous solution used can be reduced and the anion exchange resin can be regenerated with high accuracy. The method for separating and regenerating the anion exchange resin and the cation exchange resin in the mixed ion exchange resin can reduce the amount of NaOH solution used when the anion exchange resin and the cation exchange resin in the mixed ion exchange resin are separated by a concentrated alkali specific gravity separation method.

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