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US 4,990,168 AGranted
Recovery of carbon dioxide from a carbon dioxide plant vent gas using membranes
OwnerRichard A. Sauer, Joseph E. Paganessiinventors
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Abstract
A process for recovering CO.sub.2 from a CO.sub.2 liquifaction plant vent gas, which comprises feeding vent gas from a CO.sub.2 liquifaction plant to a first semi-permeable gas separation membrane through which and at a pressure at which CO.sub.2 is capable of diffusing therethrough, to form a CO.sub.2 -enriched permeate, and then returning the CO.sub.2 -enriched permeate to a feed side of said CO.sub.2 liquifaction plant at a pressure capable of effecting the same.
Claims13
A process for recovering CO.sub.2 from a CO.sub.2 liquefaction plant vent gas, said process consisting essentially of:
- (1) feeding said vent gas to at least a first semipermeable gas separation membrane to form a CO.sub.2 -enriched permeate and non-permeating gas;
- (2) venting said non-permeating gas to the atmosphere;
- (3) optionally passing said CO.sub.2 -enriched permeate from said first semipermeable gas separation membrane to a second semipermeable gas separation membrane;
- (4) optionally passing said CO.sub.2 -enriched permeate through a passive catalytic burn-out unit;
- and
- (5) passing said CO.sub.2 -enriched permeate to a feed-input of said CO.sub.2 liquefaction plant.
3 more elements
Dependencies are inferred from the claim text.