FORWARD OSMOSIS MEMBRANE AND MEMBRANE MODULE INCLUDING SAME

Title:

FORWARD OSMOSIS MEMBRANE AND MEMBRANE MODULE INCLUDING SAME

Document Type and Number:

WIPO Patent Application WO/2020/059769

Kind Code:

A1

Abstract:

Provided are a composite forward osmosis membrane and a membrane module including same. The composite forward osmosis membrane reduces salt back-diffusion and has high water-permeability, or is made of readily available materials and can be easily manufactured. Even when used at high pressure, separation between a substrate membrane support layer and a separation active layer does not occur in the composite forward osmosis membrane, and thus the composite forward osmosis membrane exhibits stable high performance. This composite forward osmosis membrane is composed of a hollow-strand porous polymer substrate membrane, wherein a separation active layer is present on the inner surface or outer surface of the substrate membrane, an inner columnar void layer having a predetermined shape is present at a predetermined thickness with respect to the thickness of the substrate membrane from the inner surface toward the center of the substrate membrane, and an outer columnar void layer is present at a predetermined thickness with respect to the thickness of the membrane from the outer surface toward the center of the substrate membrane. The substrate membrane has a water permeability F1 within a predetermined range and a rejection ratio R within a predetermined range, or the substrate membrane support layer contains a polyether sulfone having an OH group. The membrane has a thickness within a predetermined range and a compression strength within a predetermined range.

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Inventors:

INOUE FUMIYOSHI (JP)
KUBOTA NOBORU (JP)
MIKAWA MASATO (JP)
FUJITA MITSURU (JP)
KIGUCHI AKIRA (JP)
MIYAZAKI SHINJI (JP)

Application Number:

PCT/JP2019/036647

Publication Date:

March 26, 2020

Filing Date:

September 18, 2019

Export Citation:

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Assignee:

ASAHI CHEMICAL IND (JP)

International Classes:

B01D69/02; B01D61/00; B01D63/02; B01D69/08; B01D69/12; B01D71/68; D01F1/08; D01F6/76

Domestic Patent References:

WO2019131304A1	2019-07-04
WO2016027869A1	2016-02-25
WO2016027869A1	2016-02-25
WO2015141653A1	2015-09-24

Foreign References:

JP2018012072A	2018-01-25
JPH0810594A	1996-01-16
JP2014079687A	2014-05-08
JP2016029147A	2016-03-03
JP2016530078A	2016-09-29
US20140175006A1	2014-06-26
KR20160080377A	2016-07-08
US20130313185A1	2013-11-28
JP2013071106A	2013-04-22
JP2014213262A	2014-11-17

Other References: