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High carbon content filamentary membrane and method of making the same

  • US 6,565,631 B2
  • Filed: 10/03/2001
  • Issued: 05/20/2003
  • Est. Priority Date: 11/10/1999
  • Status: Expired due to Term
First Claim
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1. A carbon membrane for separating first and second gases from a feed mixture of gases, the membrane comprising:

  • an asymmetric hollow filamentary carbon membrane, comprising a partial carbonization product of an asymmetric hollow filament comprising an aromatic imide polymer material, comprising at least 95 weight percent carbon, and having a dense layer located in the outside surface portion of the hollow filamentary membrane and a porous base layer continued from the dense layer and located in the inside portion of the hollow filamentary membrane;

    wherein the carbon membrane is selectively permeable in favor of the first gas such that when a feed mixture containing the first and second gases contacts the carbon membrane, the first gas preferably passes through the membrane thereby forming a permeate enriched in the first gas and a retentate depleted in the first gas.

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