초록

Composite semi-permeable membranes comprised of an extremely thin layer of a sulfonated polysulfone polymer coated on a porous support are useful in processes for the selective permeation of ammonia from a mixture of gases containing the ammonia component in admixture with other gaseous components.

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A process for separating ammonia from a gaseous mixture thereof with other gaseous components which comprises contacting said gaseous mixture with one side of a gas separation composite membrane comprising a porous support coated with a thin layer of a cation exchange type polymer containing the sul

A process for separating ammonia from a gaseous mixture thereof with other gaseous components which comprises contacting said gaseous mixture with one side of a gas separation composite membrane comprising a porous support coated with a thin layer of a cation exchange type polymer containing the sulfonic acid ion exchange group in the polymer molecule represented by the general formula: [Figure] (I) wherein A, B, D and E are unsubstituted or substituted arylene groups with at least one A, B, D, E groups in the polymer chain repeat unit substituted by a free sulfonic acid group or its salified form: R and R′can be the same or different and represent an alkyl group or a halogenated alkyl group having from 1 to 4 carbon atoms; b represents the polymer average molecular weight, generally above about 10,000; c, d and e are integers having a value of from zero to about 6; and the degree of sulfonation －Sn is from about 0.2 to about 2; and recovering the permeate and retentate components, said polymer providing enhanced selectivity and permeability characteristics for the selective permeation and separation of ammonia as the permeate component from the other components of the gaseous mixture comprising retentate components.