Method for producing a carbon hollow fiber membrane

• US 10,150,086 B2
• Filed: 12/11/2015
• Issued: 12/11/2018
• Est. Priority Date: 12/12/2014
• Status: Active Grant

• Current Assignee: NOK Corporation
• Original Assignee: NOK Corporation
• Inventors: Watanabe, Kensuke, Yamamoto, Hirokazu
• Primary Examiner(s): Shumate, Anthony R
• Application Number:
  US15/535,256
• Publication Number:
  US 20170320020A1
• Time in Patent Office: 1,096 Days
• CPC Class Codes: B01D 67/0067 by carbonisation or pyrolysis
• CPC Class Codes: B01D 67/0088 Physical treatment with compounds, e.g. swelling, coating or impregnation
• CPC Class Codes: B01D 69/08 Hollow fibre membranes manufacture of hollow fibres D01D5/24, D01F1/08
• CPC Class Codes: B01D 69/087 Details relating to the spinning process
• CPC Class Codes: B01D 71/021 Carbon
• CPC Class Codes: B05D 1/60 Deposition of organic layers from vapour phase vapour phase deposition in general C23C14/00, C23C16/00
• CPC Class Codes: D01D 1/02 Preparation of spinning solutions
• CPC Class Codes: D01D 10/02 Heat treatment heating for finishing D02J13/00
• 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 9/24 from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: D10B 2505/04 Filters

Abstract

A hollow fiber carbon membrane is produced by preparing a membrane-forming dope for carbon membranes by dissolving 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 0.2 to 3.0 wt. % based on the polyphenylene oxide, in a solvent capable of dissolving these components; preparing the membrane-forming dope for carbon membranes into a hollow shape by means of a spinning method in accordance with a non-solvent induced separation method using a double annular nozzle; performing a crosslinking treatment at 200 to 240° C. in the air; then performing an infusibilization treatment by heating at 250 to 350° C.; and further performing a carbonization treatment by heating at 450 to 850° C. in an inert atmosphere or under vacuum.

Claims

1. A method for producing a hollow fiber carbon membrane by preparing a membrane-forming dope for carbon membranes by dissolving 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 0.2 to 3.0 wt. % based on the polyphenylene oxide, in a solvent capable of dissolving these components;

preparing the membrane-forming dope for carbon membranes into a hollow shape by means of a spinning method in accordance with a non-solvent induced separation method using a double annular nozzle;

performing a crosslinking treatment at 200 to 240°

C. in the air;

then performing an infusibilization treatment by heating at 250 to 350°

C.; and

further performing a carbonization treatment by heating at 450 to 850°

C. in an inert atmosphere or under vacuum.

2. The method for producing a hollow fiber carbon membrane according to claim 1, wherein after the carbonization treatment, the surface is further subjected to chemical vapor deposition using hydrocarbon gas.

3. A hollow fiber carbon membrane produced by the method for producing according to claim 1.

4. A hollow fiber carbon membrane produced by the method for producing according to claim 2.