Membrane-forming dope for carbon membranes and a method for producing a carbon hollow fiber membrane using the same

Patent metadata

Field	Value
Publication number	US-10150085-B2
Application number	US-201515515940-A
Country	US
Kind code	B2
Filing date	Oct 9, 2015
Priority date	Oct 30, 2014
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A membrane-forming dope for carbon membranes, comprising polyphenylene oxide in an amount giving a concentration of 15 to 40 wt. % in the membrane-forming dope, and sulfur in an amount giving a ratio of 0.1 to 5.0 wt. %, preferably 0.2 to 3.0 wt. %, of the total weight of the polyphenylene oxide and the sulfur, both of which are dissolved in a solvent that can dissolve these components. A hollow fiber carbon membrane is produced by molding the membrane-forming dope for carbon membranes in a hollow shape by means of a wet or dry-wet spinning method using a double tubular nozzle, subjecting the molded product to an infusibilization treatment by heating at 150 to 350° C. in the air, and then subjecting it to a carbonization treatment by heating at 600 to 800° C. in an inert atmosphere or under vacuum. When the product molded in a hollow shape by means of a wet or dry-wet spinning method is subjected to an infusibilization treatment by heating in the air while stretching the product with a stress of 0.002 to 0.005 MPa, a hollow fiber carbon membrane having excellent gas permeability and a further high gas separation factor (He/CH4) can be obtained.

First claim

The invention claimed is:

1. A membrane-forming dope for carbon membranes, comprising polyphenylene oxide in an amount giving a concentration of 15 to 40 wt. % in the membrane-forming dope, and sulfur in an amount giving a ratio of 0.1 to 5.0 wt. % of the total weight of the polyphenylene oxide and the sulfur, both of which are dissolved in a solvent that can dissolve these components.

2. The membrane-forming dope for carbon membranes according to claim 1 , further comprising an organic peroxide, a phenol resin crosslinking agent, or a quinone dioxime crosslinking agent.

3. A method for producing a hollow fiber carbon membrane, comprising molding the membrane-forming dope for carbon membranes according to claim 1 in a hollow shape by means of a wet or dry-wet spinning method using a double tubular nozzle, subjecting the molded product to an infusibilization treatment by heating at 150 to 350° C. in the air, and then subjecting it to a carbonization treatment by heating at 600 to 800° C. in an inert atmosphere or under vacuum.

4. The method for producing a hollow fiber carbon membrane according to claim 3 , wherein the product molded in a hollow shape by means of a wet or dry-wet spinning method is subjected to an infusibilization treatment by heating in the air while stretching the product with a stress of 0.002 to 0.005 MPa.

5. A hollow fiber carbon membrane produced by the production method according to claim 3 .

6. The hollow fiber carbon membrane according to claim 5 , wherein the surface is further subjected to chemical vapor deposition using hydrocarbon gas.

7. A hollow fiber carbon membrane produced by the production method according to claim 4 .

8. The hollow fiber carbon membrane according to claim 7 , wherein the surface is further subjected to chemical vapor deposition using hydrocarbon gas.

Assignees

• Nok Corp

Inventors

• Kondo Masataka
• Watanabe Kensuke
• Yamamoto Hirokazu

Classifications

• B01D71/021

  Carbon · CPC title

• B01D69/087 Primary

  Details relating to the spinning process · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• B01D2053/224

  with hollow fibres · CPC title

• B01D69/141

  Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes · CPC title