Polyimide gas separation membranes and process of using same

摘要

Novel aromatic polyimide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides are derived from a variety of aromatic tetracarboxylic dianhydrides used to form aromatic polyimide gas separation membranes and diamines of the formula where -x- is a divalent radical such as -o- or and -Ar'- is a divalent radical such as phenylene, napthalene, biphenyl or l