公开(公告)号：US20240401207A1

公开(公告)日：2024-12-05

申请号：US18699889

申请日：2022-08-31

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takanori YOSHINO ,  Ayako KUMAGAI ,  Kazuhisa FUJITA ,  Kenya SATO ,  Kazuya WATANABE ,  Wei XIA

IPC: C23F15/00

Abstract: The present invention addresses the problem of providing a technique for a metal corrosion protection treatment for a water system, whereby it becomes possible to achieve a satisfactory anticorrosive effect without using a phosphorus compound, which is a causative substance for eutrophication, as a metal anticorrosive agent and it also becomes possible to achieve a satisfactory anticorrosive effect in high-hardness water as well as low-hardness water. The present invention can provide: a metal corrosion protection treatment method for a water system, in which a component (A) and a component (B) as mentioned below are allowed to be present at a usage ratio of 1:9 to 7:3 by mass in the water system; and (A) a copolymer of a (meth)acrylic acid monomer and a sulfonic acid monomer, and (B) a maleic acid-based polymer in which the carboxyl group content is 11.5 mmol/g or more.

公开(公告)号：US20230375291A1

公开(公告)日：2023-11-23

申请号：US18031008

申请日：2021-10-06

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takanori YOSHINO ,  Takashi KIKKAWA ,  Kazuhisa FUJITA ,  Natsumi TANIYAMA ,  Marina YANAGIDA

IPC: F28F23/00 ,  C09K5/20

CPC classification number: F28F23/00 ,  C09K5/20 ,  F28F2025/005

Abstract: The present invention provides a technique for improving the cooling performance of a cooling tower in a circulating cooling water system having the cooling tower. The present invention provides a method for improving cooling performance of a cooling tower in a circulating cooling water system having the cooling tower, wherein cooling water used in the circulating cooling water system is cooling water to which an agent including a surfactant is added, and the cooling water satisfies (a) a dynamic contact angle of 55° or less and (b) a bubble bulkiness of 250 mL or less.

公开(公告)号：US20180194659A1

公开(公告)日：2018-07-12

申请号：US15741920

申请日：2016-06-29

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Kunihiro HAYAKAWA ,  Kazuhisa FUJITA

IPC: C02F9/00

CPC classification number: C02F9/00 ,  B01D61/02 ,  B01D61/14 ,  B01D61/58 ,  B01D2311/04 ,  B01D2311/12 ,  B01D2311/18 ,  C02F1/004 ,  C02F1/441 ,  C02F1/444 ,  C02F1/66 ,  C02F5/10 ,  C02F5/105 ,  C02F2103/023 ,  C02F2103/16 ,  C02F2103/28 ,  C02F2303/08 ,  C02F2303/22 ,  F28B9/04 ,  F28F19/00 ,  F28F25/02 ,  F28G13/00

Abstract: Water discharged from a circulating cooling water system is treated by a water recovery system including a clarification equipment and an RO membrane, and treated water is returned to the circulating cooling water system. A dispersant is added to the circulating cooling water system for dispersing scale components. The dispersant includes a polymer having a carboxyl group and having a weight average molecular weight of 5,000 or less, and permeates through the clarification equipment. The polymer having a carboxyl group and having a weight average molecular weight of 5,000 or less permeates through the clarification equipment, and performs as a scale dispersing agent for the RO membrane, preventing precipitation of scale. Since the polymer intrinsically has an anticorrosion effect, it becomes unnecessary to add a phosphoric acid compound to the cooling water system as an anticorrosion agent, or the required amount of the compound to be added can be reduced.