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US 5,964,925 AGranted
Sulfonated polyimide gas separation membranes
AssigneePraxair Technology, Inc.
InventorsYurdagul F. Ozcayir, Gertrud Goetz, Benjamin Bikson
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Abstract
Gas separation membranes are prepared from sulfonated polyimides exhibiting desirable gas separation characteristics, combined with good film-forming properties and desirable solubility characteristics.
Claims6
A gas separation membrane formed from an aromatic polyimide of the following general formula:
- ##STR7## wherein Ar.sub.1 and Ar.sub.2 are organic radicals with at least 80% of the Ar.sub.1 and Ar.sub.2 radicals comprising aromatic radicals, and wherein a portion of said Ar.sub.2 radicals is a sulfonic acid radical selected from the group consisting of 4,4'-diaministilbene-2,2'-disulfonic acid, 4,4'-diamino-2,2'-biphenyldisulfonic acid, one of their respective salts, or mixtures thereof.
A gas separation membrane formed from an aromatic polyimide of the following general formula:
- ##STR8## wherein Ar.sub.1 and Ar.sub.2 are organic radicals with at least 80% of the Ar.sub.1 and Ar.sub.2 radicals comprising aromatic radicals, and wherein a portion of each of said Ar.sub.1 and Ar.sub.2 aromatic radicals contain sulfonic acid radicals.
Dependencies are inferred from the claim text.