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The separation of polar gases from nonpolar gases may be effected by passing a mixture of nonpolar gases over the face of a multicomponent membrane at separation conditions. The multicomponent membrane which is used to effect the separation will comprise a mixture of a glycol plasticizer having a mo

The separation of polar gases from nonpolar gases may be effected by passing a mixture of nonpolar gases over the face of a multicomponent membrane at separation conditions. The multicomponent membrane which is used to effect the separation will comprise a mixture of a glycol plasticizer having a molecular weight of from about 200 to about 600 and an organic polymer cast on a porous support. The porous support is pretreated prior to casting of the mixture thereon by contact with a polyhydric alcohol whereby the pores of the support are altered, thus adding to the increased permeability of the polar gas.

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A multicomponent membrane, useful for the separation of fluid components of a fluid feed mixture, comprising a mixture of a glycol plasticizer and an organic polymer cast on a porous support which has been subjected to treatment prior to the casting of said mixture thereon by contact with a polyhydr

A multicomponent membrane, useful for the separation of fluid components of a fluid feed mixture, comprising a mixture of a glycol plasticizer and an organic polymer cast on a porous support which has been subjected to treatment prior to the casting of said mixture thereon by contact with a polyhydric alcohol. A process for the separation of a polar gas from a nonpolar gas in a feed mixture containing said gases which comprises contacting said mixture with the upstream face of a multicomponent membrane which comprises a mixture of a glycol plasticizer having a molecular weight of from about 200 to about 600 and an organic polymer cast on a porous support, said support having a ratio of total surface area to total pore cross-sectional area of from about 5:1 to about 900:1 and which has been subjected to pretreatment prior to the casting of said mixture thereon by contact with a polyhydric alcohol, at separation conditions, in which said polar gas has a greater steady state permeability than said nonpolar gas, and recovering the permeate which emanates from the downstream face of said membrane, said permeate comprising a product mixture in which the proportion of polar gas to nonpolar gas is greater than the proportion of polar gas to nonpolar gas in said feed mixture.