The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2000
Filed:
Oct. 27, 1998
Noriyuki Saito, Yokohama, JP;
Mineo Izumi, Yokohama, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
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 m.sup.2 /g, and (C) a step of removing dissociable impurities by means of a mixed bed ion exchange resin.