公开(公告)号：US20250025869A1

公开(公告)日：2025-01-23

申请号：US18713695

申请日：2022-09-14

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takahiro KAWAKATSU ,  Yu FUJIMURA ,  Takaaki CHUUMAN

IPC: B01J41/14 ,  B01J39/07 ,  B01J41/07 ,  B01J47/014

Abstract: Provided is a material for removing impurities in an organic solvent having a water content of 1,000 ppm or less, the material comprising a porous ion exchange resin. It is preferred that the porous ion exchange resin has, as an ion exchange group, at least one functional group selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group and a quaternary ammonium group. Also provided is a method for removing impurities in an organic solvent, the method comprising bringing the material for removing impurities in an organic solvent into contact with an organic solvent having a water content of 1,000 ppm or less.

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.