Membranes

Patent metadata

Field	Value
Publication number	US-9586183-B2
Application number	US-201314408737-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Jun 26, 2012
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A composite membrane comprising: a. a porous support; b. a polymeric layer comprising dialkylsiloxane groups and a metal, the polymeric layer being present on the porous support; c. a discriminating layer present on the polymeric layer; and d. optionally a protective layer present on the discriminating layer wherein the polymeric layer has a molar ratio of metal:silicon of at least 0.0005.

First claim

The invention claimed is:

1. A composite membrane comprising:
a. a porous support; and
b. a polymeric layer comprising dialkylsiloxane groups and a metal, the polymeric layer being present on the porous support;
c. a discriminating layer present on the polymeric layer; and
d. optionally a protective layer present on the discriminating layer

wherein the polymeric layer has a molar ratio of metal:silicon of at least 0.0005.

2. The membrane according to claim 1 , wherein the metal is derived from a metal complex.

3. The membrane according to claim 1 , wherein the metal is selected from any one of groups 4 and 5 of the periodic table.

4. The membrane according to claim 1 , wherein the metal is titanium, zirconium, hafnium, vanadium or niobium.

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

6. The membrane according to claim 1 , wherein the average thickness of the discriminating layer is 20 nm to 2 μm and the polymeric layer has an average thickness of 25 to 1200 nm.

7. The membrane according to claim 1 , wherein the porous support has surface pores of average diameter 0.001 to 0.1 μm.

8. The composite membrane according to claim 1 which is a composite gas separation membrane.

9. A gas separation cartridge comprising a composite membrane according to claim 1 .

10. The composite membrane according to claim 1 wherein:
(a) the metal is derived from a metal complex;
(b) the metal is selected from any one of groups 4 and 5 of the periodic table;
(c) the discriminating layer comprises a polyimide comprising trifluoromethyl groups;
(d) average thickness of the discriminating layer is 20 nm to 2 μm; and
(e) the polymeric layer has an average thickness 25 to 1200 nm.

11. The composite membrane according to claim 10 which is a composite gas separation membrane.

12. The composite membrane according to claim 1 which is a composite gas separation membrane and has a pure water permeability at 20° C. of less than 6.10-8 m3/m2·s·kPa.

13. The composite membrane according to claim 10 which is a composite gas separation membrane and has a pure water permeability at 20° C. of less than 6.10-8 m3/m2·s·kPa.

14. A gas separation cartridge comprising a composite membrane according to claim 4 .

15. A gas separation cartridge comprising a composite membrane according to claim 6 .

16. A gas separation cartridge comprising a composite membrane according to claim 10 .

17. A process for preparing a composite membrane comprising the steps:
(i) applying to a porous support a radiation-curable composition comprising a polymerisable dialkylsiloxane and a metal;
(ii) irradiating the radiation-curable composition on the support, thereby forming a polymeric layer comprising dialkylsiloxane groups and a metal on the porous support;
(iii) forming a discriminating layer on the polymeric layer; and
(iv) optionally forming a protective layer on the discriminating layer;

wherein the polymeric layer has a molar ratio of metal:silicon of at least 0.0005.

18. The process according to claim 17 wherein the radiation-curable composition comprises a metal complex and a polymerisable poly(dialkylsiloxane).

19. The process according to claim 17 which further comprises the step of forming a protective layer on the discriminating layer (step (iv)).

20. The process according to claim 19 wherein:
(a) the metal is derived from a metal complex;
(b) the metal is selected from any one of groups 4 and 5 of the periodic table;
(c) the discriminating layer comprises a polyimide comprising trifluoromethyl groups;
(d) average thickness of the discriminating layer is 20 nm to 2 μm; and
(e) the polymeric layer has an average thickness 25 to 1200 nm.

Assignees

• Fujifilm Mfg Europe Bv
• Fujifilm Imaging Colorants Ltd

Inventors

• Van Kessel Petrus

Classifications

• B01D53/228

  characterised by specific membranes · CPC title

• B01D69/127

  using electrical discharge or plasma-polymerisation · CPC title

• B01D2323/30

  Cross-linking · CPC title

• B01D71/64

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

• B01D71/022

  Metals · CPC title