Title:
CHEMICAL WASHING LIQUID FOR SEPARATION MEMBRANE
Document Type and Number:
Japanese Patent JP3905617
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently restore the function of a separation membrane without deteriorating the material of the membrane by using a mixed aq. soln. contg. citric acid and a detergent in a specified ratio as a chemical washing liq. for the separation membrane.
SOLUTION: This chemical washing liq. is made of an aq. soln. contg. citric acid and a detergent. From the viewpoint of the restoration of the water treating ability of a separation membrane, citric acid is contained in the mixed aq. soln. by 0.1-2 wt.%, preferably 0.1-1 wt.%, the detergent is contained by 0.05-4 wt.%, preferably 0.1-2 wt.% and the ratio of the citric acid content to the detergent content is regulated to the range of 0.1-3, preferably 0.1-2. The chemical washing liq. is easily prepd., has stable effective detergency and can easily restore the water treating ability of a separation membrane module without requiring any special control of the module or deteriorating the quality of the separation membranes. Washing operation is simple, washing time can be considerably shortened and washing ability is enhanced.
Inventors:
Nakatsuka Osamu
Sachiko Matsuoka
Sachiko Matsuoka
Application Number:
JP30931997A
Publication Date:
April 18, 2007
Filing Date:
October 23, 1997
Export Citation:
Assignee:
Daicel Chemical Industry Co., Ltd.
International Classes:
B01D65/06; B01D71/16; C11D1/02; C11D1/12; C11D1/38; C11D3/20; (IPC1-7): B01D65/06; B01D71/16; C11D1/12; C11D3/20
Domestic Patent References:
| JP58020205A | ||||
| JP63100996A | ||||
| JP7144120A | ||||
| JP60114304A | ||||
| JP3114304A |
Attorney, Agent or Firm:
Satoshi Furuya
Takahiko Mizobe
Shinji Mochida
Yoshitsune Kazumasa
Takahiko Mizobe
Shinji Mochida
Yoshitsune Kazumasa