ANION EXCHANGER, MIXTURE OF ANION EXCHANGER AND CATION EXCHANGER, MIXED BED COMPRISING ANION EXCHANGER AND CATION EXCHANGER, PRODUCTION PROCESSES THEREFOR, AND METHOD FOR PURIFYING AQUEOUS HYDROGEN PEROXIDE SOLUTION

摘要

A process for producing a mixture of an anion exchanger and a cation exchanger, characterized by including an anion-exchanger conversion step (1) in which an aqueous carbon dioxide solution obtained by dissolving carbon dioxide gas in pure water or ultrapure water is brought into contact with a mixture of an anion exchanger (B) and a cation exchanger to thereby convert the anion exchanger (B) to an anion exchanger (A) having a bicarbonate ion form or having both a bicarbonate ion form and a carbonate ion form and obtain a mixture of the anion exchanger (A) and the cation exchanger. According to the invention, it is possible to convert the anion exchanger of a mixture of an anion exchanger and a cation exchanger to the bicarbonate ion form or to both the bicarbonate ion form and the carbonate ion form, while maintaining the mixture state.