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Gas separation using organic-vapor-resistant membranes and PSA

  • US 6,592,650 B2
  • Filed: 03/25/2002
  • Issued: 07/15/2003
  • Est. Priority Date: 05/19/2000
  • Status: Expired due to Term
First Claim
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1. A process for treating a gas mixture comprising a desired gas and an organic vapor, the process comprising the following steps:

  • (a) bringing the gas mixture into contact with the feed side of a separation membrane having a feed side and a permeate side, the separation membrane having a selective layer comprising;

    a polymer comprising repeating units having a fluorinated cyclic structure of an at least 5-member ring, the polymer having a fractional free volume no greater than about 0.3;

    (b) providing a driving force for transmembrane permeation;

    (c) withdrawing from the permeate side a permeate stream enriched in the desired gas compared to the gas mixture;

    (d) withdrawing from the feed side a residue stream depleted in the desired gas compared to the gas mixture;

    (e) passing at least a portion of the permeate stream as a feed stream to an adsorption unit adapted to preferentially sorb the organic vapor;

    (f) withdrawing from the adsorption unit a non-adsorbed product stream enriched in the desired gas compared to the gas mixture.

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