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US 5,393,323 AGranted
Aromatic polyethersulfone gas separation membranes
AssigneeL'Air Liquide
InventorJohn W. Simmons
Life of this patent
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Abstract
Novel alkyl-substituted aromatic polyethersulfone gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyethersulfones are formed from aromatic alcohols of the formula ##STR1## where Z is independently alkyl groups having 1 to 10 carbon atoms, most preferably a tertiary butyl group, n is an integer from 1 to 4, preferably 1.
Claims6
A gas separation membrane formed from an aromatic polyethersulfone comprising:
- (a) at least one unit derived from the following formula:
- ##STR6## where Z is independently, alkyl groups having 1 to 10 carbon atoms, or aromatic groups having 6 to 12 carbon atoms;
- n is independently an integer from 1 to 4 inclusive ##STR7## and (b) at least one unit derived from an aromatic dihalogenated sulfone.
Dependencies are inferred from the claim text.