NOVEL POLYAMIDE COMPOSITE MEMBRANES FOR GAS SEPARATION PREPARED BY INTERFACIAL POLYCONDENSATION

Interfacial polycondensed composite membranes are well known for rever se osmosis. This study describes the preparation of interfacial polyme rized composite membranes for gas separation obtained from new polyami des. The polymers were synthesized by derivates of terephthaloylchlori de and commercially available multifunctional amines. The membrane pol ymers consist of linear or crosslinked chains. A high flux of carbon d ioxide, 0.3 m(3) m(-2) h(-1) bar(-1), was observed, combined with a ca rbon dioxide/nitrogen selectivity up to 30. The permeability to hydroc arbons increased with hydrocarbon vapor concentrations. The synthesis of the thin polyamide layer was transmitted to a continuous production . (C) 1997 John Wiley & Sons, Inc.