B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/16, 117/88.5
B01D 53/22 (2006.01) B01D 71/64 (2006.01) C08G 73/10 (2006.01)
Patent
CA 1321688
TITLE POLYIMIDE GAS SEPARATION MEMBRANES ABSTRACT OF THE DISCLOSURE Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with diamines having alkyl substituents on all ortho positions to the amine functions, or with mixtures of diamines, some components having substituents on all positions ortho to the amine functions, are disclosed. Membranes formed from this class of polyimides have improved environmental stability and superior gas permeability. The range of gas permeation properties observed allows for the tailoring of membrane material for widely diverse gas separations. The high permeabilities of some gases from multicomponent mixtures is due to the optimization of the molecular free volume in the polymer.
549790
E. I. Du Pont de Nemours And Company
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Geo
L`air Liquide S.a.
Sim & Mcburney
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