公开(公告)号：US20160159672A1

公开(公告)日：2016-06-09

申请号：US14906441

申请日：2014-07-22

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ikunori YOKOI ,  Takeo FUKUI ,  Yoichi TANAKA

IPC: C02F9/00 ,  C02F1/44

CPC classification number: C02F9/00 ,  B01D61/022 ,  B01D61/025 ,  B01D61/142 ,  B01D61/145 ,  B01D61/147 ,  B01D61/58 ,  B01D65/02 ,  B01D2311/2623 ,  B01D2311/2692 ,  B01D2317/04 ,  B08B3/14 ,  B08B9/027 ,  B08B9/032 ,  C02F1/20 ,  C02F1/32 ,  C02F1/325 ,  C02F1/42 ,  C02F1/441 ,  C02F1/444 ,  C02F2103/04 ,  C02F2301/043 ,  C02F2303/04 ,  C02F2303/16

Abstract: Contaminants present inside an ultrapure water production system are prevented from being fed into a feed pipe connected to a water use point and, after sterilization cleaning, the system is prevented from being contaminated by contaminants captured on a microparticle removal membrane during sterilization cleaning. Ultrapure water having high quality is thereby fed to a water use point within a short period of time. An ultrapure water production system is provided with a tank, a pump, a heat exchanger, an ultraviolet device, an ion-exchange device, a first microparticle removal membrane device, and a second microparticle removal membrane device. Parts of sterilization water and flush water are fed into the first microparticle removal membrane device and discharged from a feedwater-side potion to a concentrated-water-side portion without permeating through a microparticle removal membrane thereof, and the remaining part of the water is passed through the second microparticle removal membrane device.

Abstract translation: 存在于超纯水生产系统内的污染物被防止进入连接到使用点的进料管中，并且在灭菌清洁之后，防止在灭菌清洁期间系统被捕获在微粒去除膜上的污染物污染。 因此，优质的超纯水在短时间内供给到使用点。 超纯水生产系统设置有罐，泵，热交换器，紫外线装置，离子交换装置，第一微粒除去膜装置和第二微粒除去膜装置。 灭菌水和冲洗水的一部分被供给到第一微粒去除膜装置中，并且从给水侧部分排出到浓缩水侧部分而不渗透通过其除去微粒膜，并且剩余部分的水通过 通过第二微粒去除膜装置。

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.