Membranes comprising aminoacid salts in polyamine polymers and blends
AssigneeExxon Research & Engineering Co.
InventorW. S. Winston Ho
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Abstract
The present invention is directed toward a composition comprising a polyamine or its polymer blend and at least one salt of an aminoacid, the salt of the aminoacid being present in an amount ranging from about 10 to 80 wt % based on the total weight of the composition. Another embodiment of the present invention comprises a membrane suitable for use in separating CO.sub.2 from gas streams containing CO.sub.2, especially H.sub.2 rich gas streams containing CO.sub.2 and CO. The membrane of this invention with polyamine shows higher CO.sub.2 selectivity and permeability than the prior membrane without polyamine.
Claims10
A membrane formed from a composition comprising:
- (a) a polyamine or its polymer blend,
- (b) at least one salt of an aminoacid, the salt of the aminoacid being present in an amount ranging from about 10 to about 80 wt % based on the total weight of the composition, wherein the aminoacid salt is selected from salts having the formulae:
- ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are hydrogen or alkyl groups having from 1 to 4 carbon atoms, n is an integer ranging from 0 to 4, A.sup.m+ is a cation having a valence of 1 to 3 and selected from metals of Groups IA, IIA, and IIIA of the Periodic Table of Elements and an amine cation having the formula:
- ##STR4## wherein R.sub.4 and R.sub.5 are hydrogen or alkyl groups having from 1 to 4 carbon atoms, R.sub.6 is hydrogen, an alkyl group of from 1 to 4 carbon atoms or an alkyl amine of from 2 to 6 carbon atoms and 1 to 4 nitrogen atoms, y is an integer ranging from 1 to 4, and m is an integer equal to the valence of the cation, and
- (c) about 1 to about 20 wt % of cross-linking agent based on the total weight of composition.
Dependencies are inferred from the claim text.