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Multicomponent gas separation membranes having polyphosphazene coatings

  • US 4,728,345 A
  • Filed: 12/28/1983
  • Issued: 03/01/1988
  • Est. Priority Date: 12/28/1983
  • Status: Expired due to Fees
First Claim
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1. In a multicomponent membrane for gas separation comprising a coating in occluding contact with a porous separation membrane of material, which material exhibits selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of a gaseous mixture, said porous separation membrane having a substantial void volume, wherein, with respect to one pair of gases, the material of the porous separation membrane exhibits a determined intrinsic separation factor greater than the determined intrinsic separation factor of the material of said coating, and the multicomponent membrane exhibits a separation factor significantly greater than the determined intrinsic separation factor of material of said coating and greater than the separation factor exhibited by the porous separation membrane;

  • the improvement comprising a polyphosphazene coating material having the formula;

    ##STR6## where R and R'"'"' are the same or different organic substituents and n is an integer of two or more, said polyphosphazene coating material swells no more than about 25% by volume when exposed to aliphatic and aromatic hydrocarbons contained in said gaseous mixture.

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