Gas separation membranes with intermixed layers

Patent metadata

Field	Value
Publication number	US-10005043-B2
Application number	US-201715642663-A
Country	US
Kind code	B2
Filing date	Jul 6, 2017
Priority date	Jun 26, 2012
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

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

The invention claimed is:

1. 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.

2. The composite membrane according to claim 1 wherein the discriminating layer has an average thickness of 10 to 400 nm.

3. The composite membrane according to claim 1 , wherein the discriminating layer comprises a polyimide comprising trifluoromethyl groups.

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

5. The composite membrane according to claim 1 , 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 .

6. A gas separation module comprising a composite membrane according claim 1 .

7. The composite membrane according to claim 1 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 .

8. The composite membrane according to claim 1 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 .

9. The composite membrane according to claim 7 wherein the discriminating layer comprises a polyimide comprising trifluoromethyl groups.

10. The composite membrane according to claim 8 wherein the gutter layer comprises dialkylsiloxane groups.

11. The composite membrane according to claim 1 wherein the gutter layer contains a metal and silicon in a molar ratio of at least 0.0005.

12. The composite membrane according to claim 1 which has a pure water permeability at 20° C. of less than 6×10 −8 m 3 /m 2 ·s·kPa.

13. The composite membrane according to claim 1 which has a dry thickness of 20 to 500 μm.

14. The composite membrane according to claim 10 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.

15. A gas separation module comprising a composite membrane according to claim 8 .

16. A gas separation module comprising a composite membrane according to claim 14 .

Assignees

• Fujifilm Mfg Europe Bv

Inventors

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

Classifications

• B05D3/06

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

• B01D63/08

  Flat membrane modules · CPC title

• B01D71/64

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

• B01D71/82

  characterised by the presence of specified groups, e.g. introduced by chemical after-treatment · CPC title

• B01D71/32

  containing fluorine atoms · CPC title