초록 ▼

A process for improving the permselectivity of an aromatic polyimide gas separation membrane comprising contacting the membrane with a solution of a surfactant in a solvent which swells the membrane but in which the membrane material is soluble to an extent of no more than 3% under the conditions us

A process for improving the permselectivity of an aromatic polyimide gas separation membrane comprising contacting the membrane with a solution of a surfactant in a solvent which swells the membrane but in which the membrane material is soluble to an extent of no more than 3% under the conditions used to contact the membrane.

대표청구항 ▼

A gas separation membrane comprising an aromatic polyimide posttreated with a solution of an effective amount of a surfactant in a solvent, the solvent being capable of swelling the membrane but incapable of dissolving more than 3 weight percent of the membrane under conditions of contacting the mem

A gas separation membrane comprising an aromatic polyimide posttreated with a solution of an effective amount of a surfactant in a solvent, the solvent being capable of swelling the membrane but incapable of dissolving more than 3 weight percent of the membrane under conditions of contacting the membrane, the amount of surfactant being sufficient to provide at least a 5% improvement in the selectivity of the membrane with respect to oxygen over nitrogen from a 21/79 mole ratio oxygen/nitrogen mixture over the selectivity achieved with the solvent alone. A process of separating at least one component from a gaseous mixture comprising bringing said gaseous mixture into contact with a feed side of the gas separation membrane of claim 13 in a manner to cause the component to permeate said membrane to a permeate side, the resulting gas mixture on the permeate side being enriched in the component over that of the mixture on the feed side.