Title:
SEPARATION MEMBRANE, SEPARATION MEMBRANE ELEMENT, AND SEPARATION MEMBRANE MODULE
Document Type and Number:
WIPO Patent Application WO/2016/056547
Kind Code:
A1
Abstract:
[Problem] To provide a membrane that is for forward osmosis, that maintains high porosity while reducing concentration polarization by suitably controlling the distribution of said porosity, that has high water permeability and high self-supporting properties, that can be applied to various draw solutions, and that has high chemical durability. [Solution] A separation membrane that has an inclined structure from the outer surface side toward the inner surface side thereof, said separation membrane being characterized in that when the polymer density distribution in the membrane thickness direction is measured by Raman spectroscopy, the ratio of the thickness of a layer in which the polymer density is dense and the thickness of a layer in which the polymer density is sparse is in a range that satisfies 0.25 ≤ (thickness of sparse layer)/[(thickness of dense layer) + (thickness of sparse layer)] ≤ 0.6.
Inventors:
NAKAO TAKAHITO (JP)
AKASHI MAYUMI (JP)
YAO MIYUKI (JP)
WATANUKI SEIJI (JP)
KITAGAWA TOORU (JP)
AKASHI MAYUMI (JP)
YAO MIYUKI (JP)
WATANUKI SEIJI (JP)
KITAGAWA TOORU (JP)
Application Number:
PCT/JP2015/078331
Publication Date:
April 14, 2016
Filing Date:
October 06, 2015
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B01D69/00; B01D61/00; B01D63/02; B01D69/08; B01D71/52; B01D71/68; B01D71/76; B01D71/82; C08G65/38
Domestic Patent References:
| WO2003026779A1 | 2003-04-03 | |||
| WO2013005551A1 | 2013-01-10 | |||
| WO2013156598A1 | 2013-10-24 |
Foreign References:
| JP2014508637A | 2014-04-10 | |||
| JP2013076024A | 2013-04-25 | |||
| JP2013031836A | 2013-02-14 | |||
| JP2014514150A | 2014-06-19 |
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