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Process for separating gaseous mixtures using a semipermeable membrane constructed from substituted poly(arylene oxide) polymer

  • US 4,586,939 A
  • Filed: 11/29/1983
  • Issued: 05/06/1986
  • Est. Priority Date: 08/26/1982
  • Status: Expired due to Fees
First Claim
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1. In a process for the separation of gases from a mixture containing at least two gases into two fractions, one fraction being enriched with at least one of said gases and the other fraction being depleted in same, the process comprising:

  • contacting the gaseous mixture with a semipermeable membrane in such a manner that a portion of the gaseous mixture selectively passes through the membrane resulting in the enriched fraction being on one side of the membrane and the depleted fraction being on the other side of the membrane, the improvement comprisingthe use of a single layer semipermeable membrane containing at least about 25 weight percent, based upon the total weight of the membrane, of at least one substituted poly(arylene oxide) polymer containing at least about 50 mole percent of structural units of the formula ##STR12## wherein each R is independently a C1 to C8 aliphatic radical;

    a C5 to C7 cycloaliphatic radical;

    a C1 to C8 alkoxy radical;

    a C6 to C12 aromatic radical or an inertly-substituted derivative of any one of them, each radical being free of a tertiary alpha-carbon atom; and

    each X is independently hydrogen or a halide radical at least the size of a chloride radical, with the proviso that at least one X is not hydrogen.

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