METHOD FOR PRODUCING HOLLOW FIBER CARBON MEMBRANE AND SEPARATION MEMBRANE MODULE

• US 20180078907A1
• Filed: 03/02/2016
• Published: 03/22/2018
• Est. Priority Date: 03/27/2015
• Status: Active Grant

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Inventors: Yoshimune, Miki, Haraya, Kenji, Hara, Nobuo
• Granted Patent: US 10,456,751 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 2053/224 with hollow fibres
• CPC Class Codes: B01D 2256/16 Hydrogen
• CPC Class Codes: B01D 2256/245 Methane
• CPC Class Codes: B01D 2257/102 Nitrogen
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/228 characterised by specific membranes
• CPC Class Codes: B01D 63/0232 using hollow fibers mats as precursor, e.g. wound or pleated mats
• CPC Class Codes: B01D 63/0233 forming the bundle
• CPC Class Codes: B01D 67/0067 by carbonisation or pyrolysis
• CPC Class Codes: B01D 69/08 Hollow fibre membranes manufacture of hollow fibres D01D5/24, D01F1/08
• CPC Class Codes: D01D 5/24 with a hollow structure; Spinnerette packs therefor D01D5/38 takes precedence; producing tubes of plastic material B29D; addition of agents forming hollow filaments D01F1/08
• CPC Class Codes: D01F 6/76 from other polycondensation products
• CPC Class Codes: D01F 9/24 from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 70/62 related technologies for production or treatment of textile or flexible materials or products thereof, including footwear

Abstract

An object of the present invention is to provide a method capable of easily controlling the permeation rate and the selectivity of gas molecules, in a hollow fiber carbon membrane which can be used as a gas separation membrane. The present invention provides a method of producing a hollow fiber carbon membrane, the method including: a preparation step of preparing a precursor made of an organic polymer compound in the form of a hollow fiber; a preheating step of heating the precursor to a temperature of 150° C. to 400° C. in an atmosphere containing an oxygen gas; and a carbonization step of heating the precursor which has been subjected to the preheating step to a temperature of 450° C. to 850° C., thereby carbonizing the precursor; wherein the carbonization step includes heating the precursor in the presence of a hydrocarbon gas which may contain a nitrogen atom and which has from 1 to 8 carbon atoms. This method allows for easily controlling the permeation rate and the selectivity of gas molecules, in the resulting hollow fiber carbon membrane.

Claims

1. A method of producing a hollow fiber carbon membrane, the method comprising:

a preparation step of preparing a precursor made of an organic polymer compound in the form of a hollow fiber;

a preheating step of heating the precursor to a temperature of 150°

C. to 400°

C. in an atmosphere containing an oxygen gas; and

a carbonization step of heating the precursor which has been subjected to the preheating step to a temperature of 450°

C. to 850°

C., thereby carbonizing the precursor;

wherein the carbonization step comprises heating the precursor in the presence of a hydrocarbon gas which may contain a nitrogen atom and which has from 1 to 8 carbon atoms.

2. The method of producing a hollow fiber carbon membrane according to claim 1, wherein the hydrocarbon gas is a hydrocarbon containing a carbon-carbon unsaturated bond.

3. The method of producing a hollow fiber carbon membrane according to claim 1, wherein the organic polymer compound comprises at least one selected from the group consisting of polyphenylene oxide, and a polyphenylene oxide derivative containing structures represented by the following formulae (a) and (b):

4. The method of producing a hollow fiber carbon membrane according to claim 1, wherein the method is a method of producing a hollow fiber carbon membrane which satisfies the following condition:

the radius (bend radius) of a column which does not cause the hollow fiber carbon membrane to rupture, when the hollow fiber carbon membrane is wound about the column over an arc of 180°

or more, is 5 mm or less.

5. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 1.

6. The method of producing a hollow fiber carbon membrane according to claim 2, wherein the organic polymer compound comprises at least one selected from the group consisting of polyphenylene oxide, and a polyphenylene oxide derivative containing structures represented by the following formulae (a) and (b):

7. The method of producing a hollow fiber carbon membrane according to claim 2, wherein the method is a method of producing a hollow fiber carbon membrane which satisfies the following condition:

the radius (bend radius) of a column which does not cause the hollow fiber carbon membrane to rupture, when the hollow fiber carbon membrane is wound about the column over an arc of 180°

or more, is 5 mm or less.

8. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 2.

9. The method of producing a hollow fiber carbon membrane according to claim 3, wherein the method is a method of producing a hollow fiber carbon membrane which satisfies the following condition:

[condition];

the radius (bend radius) of a column which does not cause the hollow fiber carbon membrane to rupture, when the hollow fiber carbon membrane is wound about the column over an arc of 180°

or more, is 5 mm or less.

10. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 3.

11. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 4.

12. The method of producing a hollow fiber carbon membrane according to claim 6, wherein the method is a method of producing a hollow fiber carbon membrane which satisfies the following condition:

[condition];

the radius (bend radius) of a column which does not cause the hollow fiber carbon membrane to rupture, when the hollow fiber carbon membrane is wound about the column over an arc of 180°

or more, is 5 mm or less.

13. The method of producing a hollow fiber carbon membrane according to claim 8, wherein the method is a method of producing a hollow fiber carbon membrane which satisfies the following condition:

the radius (bend radius) of a column which does not cause the hollow fiber carbon membrane to rupture, when the hollow fiber carbon membrane is wound about the column over an arc of 180°

or more, is 5 mm or less.

14. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 6.

15. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 9.

16. A separation membrane module comprising a hollow fiber carbon membrane produced by the method of producing a hollow fiber carbon membrane according to claim 12.