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US 4,789,386 AGranted
Metal ionomer membranes for gas separation
AssigneeThe Dow Chemical Company
InventorsWalter L. Vaughn, Marinda L. Wu
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Abstract
The invention relates to improved gas separation membranes fabricated from a polymer containing a hydrocarbon backbone and pendant metal ionomer groups wherein the pendant metal ionomer groups contain cations of alkali metals, alkaline earth metals, or transition metals bound to pendant --CO.sub.2.sup.-. The metal modified membranes result in improved gas selectivities with comparable or improved permeabilities over the unmodified membranes. The membranes may be used to separate gas mixtures such as carbon dioxide and methane or oxygen and nitrogen.
Claims13
A method of separating gases comprising
- (a) contacting with a feed gas mixture under pressure one side of a semipermeable membrane fabricated from a polymer containing a hydrocarbon backbone and pendant metal ionomer groups, wherein the pendant metal ionomer groups are comprised of cations of alkali metals, alkaline earth metals, or transition metals bound to pendant --CO.sub.2.sup.- ;
- (b) maintaining a pressure differential across the membrane under conditions such that at least one of the component(s) of the feed gas mixture selectively permeates through the membrane from the high pressure side to the low pressure side of the membrane;
- (c) removing the permeated gas which is enriched in the faster permeating component(s) from the low pressure side of the membrane;
- and
- (d) removing the nonpermeated gas which is depleted in the faster permeating component(s) from the high pressure side of the membrane.
2 more elements
Dependencies are inferred from the claim text.