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Asymmetric gas separation membranes

  • US 4,472,175 A
  • Filed: 06/30/1983
  • Issued: 09/18/1984
  • Est. Priority Date: 06/30/1983
  • Status: Expired due to Term
First Claim
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1. An asymmetric gas separation membrane exhibiting substantially improved gas separation selectivity comprising, a preformed asymmetric separation membrane of material having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Br nsted-Lowry acid, wherein with respect to the at least one gas, the acid contacted membrane exhibits a separation factor significantly greater than the separation factor exhibited by the membrane before acid contact.

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