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:
Sep. 28, 2021
Filed:
Jun. 29, 2016
Kurita Water Industries Ltd., Tokyo, JP;
Kunihiro Hayakawa, Tokyo, JP;
Kazuhisa Fujita, Tokyo, JP;
KURITA WATER INDUSTRIES LTD., Tokyo, JP;
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.