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Countercurrent dehydration by hollow fibers

  • US 5,002,590 A
  • Filed: 09/19/1989
  • Issued: 03/26/1991
  • Est. Priority Date: 09/19/1989
  • Status: Expired due to Term
First Claim
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1. A gas dehydration process comprising:

  • (a) contacting a feed gas containing water vapor with the lumen side of thin film composite hollow fiber membranes arranged substantially parallel to each other in a chamber, each of said composite hollow fiber membranes having an effective water vapor permeability greater than 33×

    10-4 cm3 /cm2 ·

    sec·

    cmHg (200 SCFH/ft2 ·

    100 psi) and a ratio of effective water vapor permeability to effective feed gas permeability of at least 100 and comprising(i) a highly permeable support fiber having an effective air permeability greater than 33×

    10-4 cm3 /cm2 ·

    sec·

    cmHg (200 SCFH/ft2 ·

    100 psi) and a ratio of effective water vapor permeability to effective air permeability of less than 2, and(ii) a coating on the lumens of said support fiber, said coating having a ratio of effective water vapor permeability to effective feed gas permeability of at least 100; and

    (b) permitting water in said feed gas to permeate from the lumens to the outside of said hollow fiber membranes; and

    (c) removing permeated water from said chamber at a point near the feed end of said chamber.

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