Gas Separation Membranes with Intermixed Layers

Patent metadata

Field	Value
Publication number	US-2017296981-A1
Application number	US-201715642663-A
Country	US
Kind code	A1
Filing date	Jul 6, 2017
Priority date	Jun 26, 2012
Publication date	Oct 19, 2017
Grant date	—

Abstract

A composite membrane comprising:
a) a porous support; b) a gutter layer; and c) a discriminating layer;

wherein at least 10% of the discriminating layer is intermixed with the gutter layer.

First claim

1 .- 11 . (canceled)

12 . A composite membrane comprising:
a) a porous support; b) a gutter layer; and c) a discriminating layer; wherein the discriminating layer comprises a polyimide, cellulose acetate, polyethyleneoxide or polyetherimide and wherein at least 10% of the discriminating layer is intermixed with the gutter layer.

13 . The composite membrane according to claim 12 wherein the discriminating layer has an average thickness of 10 to 400 nm.

14 . The composite membrane according to claim 12 , wherein the discriminating layer comprises a polyimide comprising trifluoromethyl groups.

15 . The composite membrane according to claim 12 , wherein the discriminating layer comprises a polyimide comprising groups of the Formula (1):

16 . The composite membrane according to claim 12 , wherein a portion of the gutter layer is present within the support and a portion of the gutter layer is outside of the support and the following conditions are satisfied:
(i) the portion of the gutter layer outside of the support has an average thickness (GL e ) of 10 nm to 900 nm; and (ii) the portion of the gutter layer present within the support has an average thickness (GL i ) of 10% to 350% of GL e .

17 . A gas separation module comprising a composite membrane according claim 12 .

18 . The composite membrane according to claim 12 wherein a portion of the gutter layer is present within the support and a portion of the gutter layer is outside of the support and the following conditions are satisfied:
(i) the portion of the gutter layer outside of the support has an average thickness (GL e ) of 200 nm to 900 nm; and
(ii) the portion of the gutter layer present within the support has an average thickness (GL i ) of 10% to 200% of GL e .

19 . The composite membrane according to claim 12 wherein a portion of the gutter layer is present within the support and a portion of the gutter layer is outside of the support and the following conditions are satisfied:
(i) the portion of the gutter layer outside of the support has an average thickness (GL e ) of 400 nm to 900 nm; and
(ii) the portion of the gutter layer present within the support has an average thickness (GL i ) of 20% to 90% of GL e .

20 . The composite membrane according to claim 18 wherein the discriminating layer comprises a polyimide comprising trifluoromethyl groups.

21 . The composite membrane according to claim 19 wherein the gutter layer comprises dialkylsiloxane groups.

22 . The composite membrane according to claim 12 wherein the gutter layer contains a metal and silicon in a molar ratio of at least 0.0005.

23 . The composite membrane according to claim 12 which has a pure water permeability at 20° C. of less than 6×10 −8 m 3 /m 2 .s.kPa.

24 . The composite membrane according to claim 12 which has a dry thickness of 20 to 500 m.

25 . The composite membrane according to claim 21 which has a pure water permeability at 20° C. of less than 6×10 −8 m 3 /m 2 .s.kPa and a dry thickness of 20 to 500 μm.

26 . A gas separation module comprising a composite membrane according to claim 19 .

27 . A gas separation module comprising a composite membrane according to claim 25 .

Assignees

• Fujifilm Mfg Europe Bv

Inventors

• Umehara Takeshi
• Nakanishi Masatoshi
• Itami Yujiro
• Noda Hiroyuki
• Kurima Akihiro
• Iwahashi Kimiko

Classifications

• B01D69/12 Primary

  Composite membranes; Ultra-thin membranes · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B05D3/06

  by exposure to radiation (B05D3/02 takes precedence {; plasma treatment B05D3/141}) · CPC title

• B01D2325/04

  Characteristic thickness · CPC title

• B01D71/70

  Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only · CPC title