Composite gas separation membrane, gas separation module, gas separation apparatus and gas separation method

Patent metadata

Field	Value
Publication number	US-2016184779-A1
Application number	US-201615063768-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Sep 9, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

There is provided a composite gas separation membrane including a gas separation layer, which is formed to include a polyimide resin, on a support layer having gas permeability, in which the polyimide resin includes a repeating unit represented by the following Formula (I)

in Formula (I), X represents a group having a specific structure represented by any of the following Formulae (I-a) to (I-h),

in Formula (I), Y 1 represents a group represented by the following Formula (II-a) or (II-b), and

in Formulae (II-a) and (II-b), R 3 represents a substituent group, A represents a dissociable group, p represents 0 or 1, p1 represents an integer of 0 to 2, and p2 represents an integer of 2 or greater.

First claim

What is claimed is:

1 . A composite gas separation membrane comprising:
a gas separation layer, which is formed to include a polyimide resin, on a support layer having gas permeability, wherein the polyimide resin includes a repeating unit represented by the following Formula (I) and a repeating unit represented by the following Formula (V),

in Formula (I), X represents a group having a structure represented by any of the following Formulae (I-a) to (I-h), X 1 represents a single bond or a divalent linking group, L represents —CH═CH— or —CH 2 —, R 1 and R 2 represent a hydrogen atom or a substituent group, and the symbol “*” represents a binding site with respect to a carbonyl group in Formula (I),

in Formula (I), Y 1 represents a group having a structure represented by the following Formula (II-a) or (II-b),

in Formulae (II-a) and (II-b), R 3 represents a substituent group, A represents a dissociable group, p represents 0 or 1, p1 represents an integer of 0 to 2, p2 represents an integer of 2 or greater, and the symbol “*” represents a connection site,

in Formula (V), X has the same definition as that for X in Formula (I), and Y 3 represents a group having a structure represented by the following Formula (VI), and

in Formula (VI), R 7 represents a substituent group, B represents a dissociable group, p4 represents an integer of 0 to 3, and the symbol “*” represents a connection site.

2 . The composite gas separation membrane according to claim 1 , wherein Y 1 is represented by Formula (II-b).

3 . The composite gas separation membrane according to claim 1 ,
wherein, when gas subjected to a separation treatment is mixed gas of carbon dioxide and methane, the permeation rate of carbon dioxide at 40° C. and 40 atm is greater than 20 GPU, and the ratio between permeation rates of carbon dioxide and methane (R CO2 /R CH4 ) is 15 or greater.

4 . The composite gas separation membrane according to claim 1 , wherein the support layer is formed of a porous layer on a gas separation layer side and a non-woven fabric layer on a side opposite to the gas separation layer.

5 . The composite gas separation membrane according to claim 1 , wherein the cut-off molecular weight of the porous layer is 100000 or less.

6 . The composite gas separation membrane according to claim 1 , which is used to allow selective permeation of carbon dioxide from gas containing carbon dioxide and methane.

7 . A gas separation module comprising the composite gas separation membrane according to claim 1 .

8 . A gas separation apparatus comprising the gas separation module according to claim 7 .

9 . A gas separation method comprising:
allowing carbon dioxide to selectively permeate from gas containing carbon dioxide and methane using the composite gas separation membrane according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Iizuka Yuusuke
• Sano Satoshi
• Hironaka Koji
• Narita Takeshi

Classifications

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B01D53/228

  characterised by specific membranes · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D71/64 Primary

  Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors · CPC title

• B01D69/1216

  Three or more layers · CPC title