Title:
SCALE INHIBITOR FOR REVERSE OSMOSIS MEMBRANES AND REVERSE OSMOSIS MEMBRANE PROCESSING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/203527
Kind Code:
A1
Abstract:
A scale inhibitor for reverse osmosis membranes, which suppresses precipitation of calcium sulfate scale during a reverse osmosis membrane processing process, and which contains, as a main component, a copolymerized polymer (A) of an acrylic acid represented by formula (A) and 2-acrylamido-2-methylpropane sulfonic acid, said copolymerized polymer (A) having a mass average molecular weight of 3,000 or more but less than 11,000. It is preferable that the reverse osmosis membrane is processed with a sulfonic acid-modified polyvinyl alcohol in advance. In formula (A), m represents the ratio (mol%) of a constituent unit that is derived from 2-acrylamido-2-methylpropane sulfonic acid; n represents the ratio (mol%) of a constituent unit that is derived from acrylic acid; m is from 15 mol% to 40 mol% (inclusive); and (m + n) is from 90 mol% to 100 mol%.
Inventors:
ISHII KAZUKI (JP)
Application Number:
PCT/JP2020/013247
Publication Date:
October 08, 2020
Filing Date:
March 25, 2020
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D61/04; B01D71/56; C02F5/00; C02F5/10; C08F220/06; C08F220/56
Foreign References:
| JP2001224933A | 2001-08-21 | |||
| JP2012213686A | 2012-11-08 | |||
| JP2009101335A | 2009-05-14 | |||
| JP2015174030A | 2015-10-05 | |||
| KR101817548B1 | 2018-02-26 | |||
| JPS61125497A | 1986-06-13 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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