公开(公告)号：US20200290873A1

公开(公告)日：2020-09-17

申请号：US16341610

申请日：2017-09-19

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ikunori YOKOI ,  Yoshiaki IDE

IPC: C01B15/013 ,  B01D61/02 ,  B01D69/02 ,  C02F1/44 ,  C02F1/42 ,  B01J39/05 ,  B01J39/20 ,  B01J41/05 ,  B01J41/14 ,  B01J47/028 ,  C08F212/08

Abstract: A purification method for an aqueous hydrogen peroxide solution includes subjecting the aqueous hydrogen peroxide solution to a reverse osmosis membrane separation treatment with a high-pressure reverse osmosis membrane separation device. The high-pressure reverse osmosis membrane has a denser skin layer on the membrane surface and is therefore lower in an amount of membrane permeate water per unit operating pressure but higher in the rejection rate of TOC and boron, as compared with a low-pressure or ultralow-pressure reverse osmosis membrane. The high-pressure reverse osmosis membrane permeate water is preferably further subjected to an ion exchange treatment with an ion exchange device including two or more columns packed with gel-type strong ion exchange resins.

公开(公告)号：US20190263660A1

公开(公告)日：2019-08-29

申请号：US16341567

申请日：2017-09-19

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ikunori YOKOI ,  Yoshiaki IDE ,  Takaaki CHUUMAN

IPC: C01B15/013 ,  B01J39/05 ,  B01J39/20 ,  B01J41/05 ,  B01J41/14 ,  B01J47/028

Abstract: A purification method for an aqueous hydrogen peroxide solution, includes passing the aqueous hydrogen peroxide solution through a first H-form strong cation exchange resin column 1, a salt-form strong anion exchange resin column 2 and a second H-form strong cation exchange resin column 3. An H-form strong cation exchange resin having crosslinking of 6% or less, an H-form strong cation exchange resin having crosslinking of 9% or more, or an H-form strong cation exchange resin produced by steps (a) and (b) is used as an H-form strong cation exchange resin packed in the second H-form strong cation exchange resin column 3: (a) copolymerizing a monovinyl aromatic monomer with a crosslinkable aromatic monomer having a non-polymerizable impurity content of 3% by weight or less therein using a predetermined amount of a specified radical polymerization initiator at a predetermined polymerization temperature to obtain a crosslinked copolymer; and (b) sulfonating the crosslinked copolymer.