초록 ▼

A novel class of polyimides useful in making semipermeable membranes for gas separation is synthesized by the reaction of 4,4′-[hexafluoroisopropylidene]-bis-[phthalic anhydride](6FDA) with 3,7-diamino-2,8-dimethyldiphenylenesulfone (AMPS). In lieu of the two methyl groups the diamine may be substit

A novel class of polyimides useful in making semipermeable membranes for gas separation is synthesized by the reaction of 4,4′-[hexafluoroisopropylidene]-bis-[phthalic anhydride](6FDA) with 3,7-diamino-2,8-dimethyldiphenylenesulfone (AMPS). In lieu of the two methyl groups the diamine may be substituted by H or C2-4 alkyl. Membranes made from the polyimides have high permeability for CO2 from mixtures containing CO2 and other gases such as CH4 and have commercially acceptable selectivity.

대표청구항 ▼

Membrane comprising a polyimide of the repeating structure －N〓(K)〓N－(Q) where (K) is [Figure] and R and R′are independently H or C1-4 alkyl. Process of separating a mixture of gases using the membrane of claim 8, wherein a feed gas stream contacts a first side of the membrane, under membrane separat

Membrane comprising a polyimide of the repeating structure －N〓(K)〓N－(Q) where (K) is [Figure] and R and R′are independently H or C1-4 alkyl. Process of separating a mixture of gases using the membrane of claim 8, wherein a feed gas stream contacts a first side of the membrane, under membrane separation conditions so that at least one component of the gas stream permeates through the membrane to be removed from a second side thereof.