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Title:
MEMBRANE SEPARATION METHOD, AND METHOD FOR MANUFACTURING LOOSE RO MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2023/276586
Kind Code:
A1
Abstract:
Provided is a membrane separation method in which a reverse osmosis method can be applied as a method for separating or concentrating a liquid to be treated having a high osmotic pressure or as a method for recovering water. This membrane separation method of a liquid to be treated having an osmotic pressure includes a first step for separating the liquid to be treated into a first permeable liquid and a first non-permeable liquid by a reverse osmosis method using a loose RO membrane (50). When the osmotic pressure of the concentration Cb' of the membrane surface of the liquid to be treated is πCb' and the maximum operating pressure difference is ΔPmax, the liquid to be treated satisfies πCb'>ΔPmax or has an osmotic pressure of 5 MPa to 100 Mpa. The loose RO membrane (50) is a membrane through which at least a portion of solutes contained in the liquid to be treated is passed together with a solvent.

Inventors:
NAKASUJI TAKEHIRO (JP)
YOKOKAWA NAOKI (JP)
KINOSHITA MASAHIRO (JP)
NAKAO SHINICHI (JP)
Application Number:
PCT/JP2022/023031
Publication Date:
January 05, 2023
Filing Date:
June 08, 2022
Export Citation:
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Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
B01D61/02; B01D61/12; B01D61/58; B01D69/02
Foreign References:
JPH09248429A1997-09-22
JP2001269543A2001-10-02
JP2001269544A2001-10-02
JPS61200810A1986-09-05
JPH04150923A1992-05-25
JP2005152818A2005-06-16
CN111807471A2020-10-23
JP2000093751A2000-04-04
JP2016155074A2016-09-01
JP2018001111A2018-01-11
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
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