ASYMMETRIC OR COMPOSITE MEMBRANES BASED ON POLYQUINOXALINES, THEIR POSSIBLE APPLICATION IN GAS PERMEATION AND MORE PARTICULARLY FOR THE FRACTIONATION OF GAS MIXTURES, AND IN PARTICULAR THE DEHYDRATION AND DEACIDIFICATION OF GASES, ESPECIALLY HYDROCARBONS

摘要

P The invention relates to an asymmetric membrane obtained from polymers of the polyquinoxalines family, characterized by the existence of a "skin" of small thickness (0.1 to a few microns) from which the defects have been eliminated and reduced the diameter of the pores to a value less than 10 Å, while ensuring a ratio between this diameter and that of the pores of the opposite face by at least 100 to allow the passage of gas molecules by a dissolution mechanism- broadcast. /P