Title:
REVERSE OSMOSIS MEMBRANE CLEANING AGENT, CLEANING LIQUID, AND CLEANING METHOD
Document Type and Number:
WIPO Patent Application WO/2017/017993
Kind Code:
A1
Abstract:
Provided is a reverse osmosis membrane cleaning agent which effectively removes contaminants that cannot be sufficiently removed by conventional cleaning agents when a reverse osmosis (RO) membrane used to treat water, particularly an aromatic polyamide-based RO membrane, becomes contaminated, and the performance thereof in terms of the permeation flux, differential pressure, salt rejection rate, and the like is reduced. This reverse osmosis membrane cleaning agent includes a compound having an N-containing saturated heterocyclic ring. Also provided are: a cleaning liquid which includes said RO-membrane cleaning agent; and a method in which the cleaning agent or the cleaning liquid is used to clean an RO membrane. The compound having the N-containing saturated heterocyclic ring, and in particular a compound having, as a skeleton, a pyrrolidine ring, a pyrrolidone ring, an imidazolidine ring, or an imidazolidinone ring, exhibits an excellent cleaning effect with respect to contaminants adhered to an aromatic polyamide-based RO membrane.
Inventors:
ISHII KAZUKI (JP)
KAWAKATSU TAKAHIRO (JP)
KAWAKATSU TAKAHIRO (JP)
Application Number:
PCT/JP2016/059148
Publication Date:
February 02, 2017
Filing Date:
March 23, 2016
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D65/06; B01D71/56; C11D1/22; C11D3/28
Foreign References:
| JP2012149202A | 2012-08-09 | |||
| JP2001507750A | 2001-06-12 | |||
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| JP2014088526A | 2014-05-15 | |||
| JP2013223835A | 2013-10-31 | |||
| JPS6023309A | 1985-02-05 | |||
| JP2015127056A | 2015-07-09 | |||
| JP2000256365A | 2000-09-19 | |||
| JP2004244345A | 2004-09-02 | |||
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| JP2003268400A | 2003-09-25 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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