DETERGENT FOR SELECTIVELY PERMEABLE FILM AND METHOD OF CLEANING

WIPO Patent Application WO/2004/076040

A1

A detergent for selectively permeable films which is highly effective in cleaning selectively permeable films, does not deteriorate the selectively permeable films, is safe for the human and the environment, and has excellent handleability. With this detergent, selectively permeable films which have been reduced in performances including permeation flux are efficiently cleaned in a short time to recover the performances. The detergent comprises a polyol having a molecular weight of 400 or lower and optionally further contains an organic solvent. The detergent is supplied to a concentrate chamber (3) of a module (1) and contacted with a selectively permeable film (2) to thereby conduct cleaning. According to need, water or an alkali solution is supplied from a water tank (6) or an alkali tank (8) to the concentrate chamber (3) of the module (1) to conduct cleaning. Thus, the selectively permeable film (2) recovers its performance.

JP3514825	METHOD FOR OPERATING WATER PURIFICATION SYSTEM AND WATER PURIFIER
JPS5955310	REGENERATING METHOD OF PERMSELECTIVE MEMBRANE
JP4683400	Water treatment equipment and water treatment method using this

KAWAKATSU TAKAHIRO (JP)
ORITA NOBUHIRO (JP)
HITOTSUYANAGI NAOTO (JP)

PCT/JP2004/002078

September 10, 2004

February 23, 2004

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KURITA WATER IND LTD (JP)
KAWAKATSU TAKAHIRO (JP)
ORITA NOBUHIRO (JP)
HITOTSUYANAGI NAOTO (JP)

B01D65/06; C11D7/26; C11D7/50; C11D11/00; (IPC1-7): B01D65/06; C11D7/26; C11D7/32; C11D7/50; B08B3/08

JPS5845712A	1983-03-17
JPS52125475A	1977-10-21
JP2001161811A	2001-06-19
JPH08281081A	1996-10-29
JP2000325758A	2000-11-28

See also references of EP 1600204A4

Yanagihara, Shigeru (10-4 Toranomon 3-chom, Minato-ku Tokyo 01, JP)

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