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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
First Claim
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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.

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