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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.:

US 10780400 B1

PDFFull Text
Date of Patent:
Sep. 22, 2020

Filed:

Mar. 23, 2016

Agent, liquid, and method for cleaning reverse osmosis membrane

Applicant:

Kurita Water Industries Ltd., Tokyo, JP;

Inventors:

Kazuki Ishii, Tokyo, JP;

Takahiro Kawakatsu, Tokyo, JP;

Assignee:

KURITA WATER INDUSTRIES LTD., Tokyo, JP;

Attorney:

Manabu Kanesaka

Primary Examiner:

Gregory R Delcotto

Int. Cl.
CPC ...
B01D 65/02 (2006.01); B01D 71/56 (2006.01); C11D 3/32 (2006.01); C11D 7/32 (2006.01); C11D 3/04 (2006.01); B08B 3/08 (2006.01); B08B 3/04 (2006.01); C11D 3/28 (2006.01); B01D 65/08 (2006.01); C11D 1/02 (2006.01); C11D 3/33 (2006.01); C11D 11/00 (2006.01); B01D 61/02 (2006.01);
U.S. Cl.
CPC ...
B01D 65/02 (2013.01); B01D 65/08 (2013.01); B01D 71/56 (2013.01); B08B 3/04 (2013.01); B08B 3/041 (2013.01); B08B 3/08 (2013.01); C11D 1/02 (2013.01); C11D 3/042 (2013.01); C11D 3/28 (2013.01); C11D 3/32 (2013.01); C11D 3/33 (2013.01); C11D 7/3263 (2013.01); C11D 11/0011 (2013.01); B01D 61/025 (2013.01); B01D 2321/168 (2013.01); Y02A 20/131 (2018.01);
Abstract

Provided is an agent and a liquid for cleaning an RO membrane to remove effectively foulants that can not be sufficiently removed with conventional cleaning agents when an RO membrane particularly an aromatic polyamide RO membrane has been used for water treatment and has become fouled resulting in degradation of performance such as permeation flux, pressure difference, and salt rejection rate. The agent for cleaning an RO membrane includes an aliphatic amide and/or an aromatic amide. Also provided is a method for cleaning an RO membrane with the cleaning agent or the cleaning liquid. The aliphatic amide and/or the aromatic amide particularly an aliphatic amide and/or an aromatic amide being soluble in water and having a relatively low molecular weight remove effectively foulants adhered on an aromatic polyamide RO membrane.

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