Title:
COMPOSITE SEMIPERMEABLE MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2023/048288
Kind Code:
A1
Abstract:
The present invention provides a composite semipermeable membrane which can achieve both of high salt removal performance and water permeability under a condition where the pressure is variable. The composite semipermeable membrane according to the present invention is provided with a microporous support membrane and a separation functioning layer containing a crosslinked aromatic polyamide, in which, when cross-sectional surfaces of arbitrarily selected ten areas each having a length of 2.0 μm in the direction along the film surface of the composite semipermeable membrane are observed, the average number density of protrusions each having a height of 1/5 or more of the 10-point average surface roughness in the separation functioning layer on each of the cross-sectional surfaces is 13.0 protrusions/μm or more, the average value of the amounts of deformation of the protrusions when the protrusions are pressed in at a force of 5 nN is 2.2 nm or less, and the standard deviation of the amounts of deformation is 1.2 nm or less.
Inventors:
OGAWA KUMIKO (JP)
SHIMURA HARUTOKI (JP)
OGAWA TAKAFUMI (JP)
SHIMURA HARUTOKI (JP)
OGAWA TAKAFUMI (JP)
Application Number:
PCT/JP2022/035764
Publication Date:
March 30, 2023
Filing Date:
September 26, 2022
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B01D69/00; B01D69/10; B01D69/12; B01D71/56
Domestic Patent References:
| WO2016136966A1 | 2016-09-01 | |||
| WO2016002821A1 | 2016-01-07 |
Foreign References:
| JP2016144794A | 2016-08-12 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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