Method of purifying aqueous solution of hydrogen peroxide

摘要

A method of purifying an aqueous solution of hydrogen peroxide by using an ion exchange resin and a adsorbent to obtain a highly pure aqueous solution of hydrogen peroxide with a metal concentration of not more than 0.1 ppb and a total organic carbon concentration of not more than 10 ppm, which comprises, in the order of purificatory passage of the solution, (A) a step of removing dissociable impurities by means of a mixed bed ion exchange resin, (B) a step of removing undissociable impurities by means of a hydrophilic porous adsorbent having a specific surface of not less than 1000 m2/g, and (C) a step of removing dissociable impurities by means of a mixed bed ion exchange resin.