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Method and apparatus for on-line measurement of the permeation characteristics of a permeant through dense nonporous membrane

  • US 6,335,202 B1
  • Filed: 06/10/1999
  • Issued: 01/01/2002
  • Est. Priority Date: 06/11/1998
  • Status: Expired due to Fees
First Claim
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1. A method for measuring permeation characteristics of a permeant through a dense nonporous membrane, comprising:

  • (a) storing a liquid feed in a feed tank at a prescribed temperature;

    (b) permeating said liquid feed from said feed tank through a membrane from which moisture residues and volatile components have been eliminated and the temperature of which is kept constant by a heating oven;

    (c) passing the permeant from said membrane through a mass flow meter to generate a potential difference, which is simultaneously displayed and recorded with time in a recorder that is connected to a digital display, to measure the permeation rate thereof;

    (d) measuring the composition of the permeant on-line by passing the permeant from said mass flow meter through a gas chromatograph equipped with a thermal conductivity detector; and

    (e) condensing the permeant after passing said gas chromatograph with a condenser equipped with a refrigerator.

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