Title:
POROUS MEMBRANE AND DESALINATION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/071005
Kind Code:
A1
Abstract:
With porous membranes in the related art, if the porous membrane is used with a filtration undiluted solution that is easily contaminated, membrane closure occurred due to turbidity separated by filtration and, as a result, membrane clogging occurred, and permeation performance readily deteriorated. The purpose of the present invention is to provide a porous membrane that has high permeability and excellent stain resistance, and is capable of maintaining high filtrate permeability with respect to a filtration undiluted solution that is easily contaminated. A porous membrane according to the present invention comprises polyvinylidene fluoride resin, and, given surface A as one surface thereof and surface B as the other surface thereof, has a ratio (Hα/Hβ) of an α-type structural crystal (Hα) to a β-type structural crystal (Hβ) in a crystalline portion of the polyvinylidene fluoride resin measured by an attenuated total reflection (ATR) method at the surface A from 0 to 0.5, a pure water permeability of 0.25 to 1.2 m3/m2/h/50 kPa, and an average value of a surface pore diameter of a surface pore of the surface A of the porous membrane from 5.0 to 12.0 nm.
Inventors:
TACHIBANA TAKASHI (JP)
SHIMURA SHUN (JP)
HANAKAWA MASAYUKI (JP)
HANADA SHIGEHISA (JP)
SHIMURA SHUN (JP)
HANAKAWA MASAYUKI (JP)
HANADA SHIGEHISA (JP)
Application Number:
PCT/JP2023/034640
Publication Date:
April 04, 2024
Filing Date:
September 25, 2023
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B01D61/04; B01D61/12; B01D61/22; B01D61/58; B01D63/02; B01D65/02; B01D69/00; B01D69/02; B01D69/08; B01D71/34; C02F1/44
Domestic Patent References:
| WO2019044312A1 | 2019-03-07 |
Foreign References:
| JP2021041313A | 2021-03-18 | |||
| JP2015073916A | 2015-04-20 | |||
| US20190126208A1 | 2019-05-02 | |||
| JP2017029934A | 2017-02-09 |
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