초록 ▼

Disclosed is an ultrathin permselective polyetherimide membrane having an average thickness of less than about 10 microns and formed of a polymeric composition comprising a polyetherimide prepared by reacting metaphenylenediamine and certain aromatic bis(ether anhydride)s. A gas separation process e

Disclosed is an ultrathin permselective polyetherimide membrane having an average thickness of less than about 10 microns and formed of a polymeric composition comprising a polyetherimide prepared by reacting metaphenylenediamine and certain aromatic bis(ether anhydride)s. A gas separation process employing the membrane is also disclosed.

대표청구항 ▼

A process for selectively removing a gaseous component from a gaseous mixture containing the component, which comprises contacting a major surface of an ultrathin permselective polyetherimide membrane having an average thickness of less than 10 microns and formed of a polymeric composition comprisin

A process for selectively removing a gaseous component from a gaseous mixture containing the component, which comprises contacting a major surface of an ultrathin permselective polyetherimide membrane having an average thickness of less than 10 microns and formed of a polymeric composition comprising a polyetherimide consisting essentially of repeating units of the following formula: [Figure] [Figure] wherein n is an integer from 1-8 and the oxygen atoms linking the phenylene and phthalimide rings are in the 3,3′; 4,4′; 3,4′positions or mixtures thereof on the phthalimide rings with a gaseous mixture containing at least two gaseous components selected from the group consisting of N2,C2H4, A, CO, O2, CO2, H2 and NH3 to effect selective removal from said mixture of the component having the highest permeability of the components present with respect to said membrane, said membrane increasing in permeability to said gaseous components in the order given.