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Title:
WATER-TREATMENT MEMBRANE, WATER-TREATMENT MEMBRANE ELEMENT AND METHOD FOR PRODUCING SAME, AND SUPPORT LAYER
Document Type and Number:
WIPO Patent Application WO/2016/204222
Kind Code:
A1
Abstract:
The water-treatment membrane according to the present invention has a support layer and a porous membrane layer, wherein, after 83 L of water per m2 of the membrane surface area has been passed through the water-treatment membrane at 20°C and then the water-treatment membrane is immersed in 22 L of water per m2 of the membrane surface area at 20°C for 16 h, the amount of all organic carbon that is eluted into the immersion water is 2.0 mg/L or less, or the amount of a non-ionic surfactant that is eluted into the immersion water is 0.5 mg/L or less. The method for producing a water-treatment membrane element according to the present invention has step (a) or (b). Step (a): immersing a water-treatment membrane having a support layer and a porous membrane layer in washing liquid which can dissolve a non-ionic surfactant so that at least the porous membrane layer of the water-treatment membrane is in contact with the washing liquid, and thereafter, causing the washing liquid to permeate from the porous membrane layer into the support layer, and discharging the washing liquid permeating the support layer to the outside of the water-treatment membrane. Step (b): washing the support layer with at least two different solvents, and thereafter, forming the porous membrane layer so that the porous membrane layer is adjacent to the washed support layer.

Inventors:
HINENOYA TAKASHI (JP)
MINAGAWA MASAKAZU (JP)
SHIBATA NORITAKA (JP)
TERAMACHI MASASHI (JP)
TAKAHASHI SHUSAKU (JP)
FUKUBA YOSHINORI (JP)
Application Number:
PCT/JP2016/067925
Publication Date:
December 22, 2016
Filing Date:
June 16, 2016
Export Citation:
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Assignee:
MITSUBISHI RAYON CO (JP)
International Classes:
B01D67/00; B01D69/10; B01D69/12
Domestic Patent References:
WO2012108429A12012-08-16
Foreign References:
JP2013198889A2013-10-03
JP2013155470A2013-08-15
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
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