Two phase pressure swing adsorption process
AssigneeThe BOC Group, Inc.
InventorsYudong Chen, Akhilesh Kapoor, Narayanan Ramprasad
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Abstract
High purity strongly adsorbed gas, e. g., carbon monoxide, is separated from a gas mixture containing one or more other gas components, e. g., hydrogen carbon dioxide, methane, nitrogen and possibly other impurities, by a two-phase pressure swing adsorption process carried out in one or more adsorption vessels arranged in parallel and containing adsorbent which adsorbs the strongly adsorbed gas more readily than the other components of the gas mixture. The process includes two evacuation steps and two or more purge steps.
Claims31
A process for separating an adsorbable gas from a feed gas mixture by a pressure swing adsorption process comprising, in sequence, the steps:
- (a) passing said feed gas mixture at superatmospheric pressure cocurrently through at least one adsorption zone containing an adsorbent which selectively adsorbs said adsorbable gas from said feed gas mixture, thereby producing a first adsorbable gas-depleted gas stream;
- (b) depressurizing said adsorption zone, thereby producing an adsorbable gas-enriched gas stream;
- (c) purging the adsorbent in said at least one adsorption zone with said adsorbable gas-enriched gas stream, thereby producing a first purge effluent;
- (d) purging the adsorbent in said at least one adsorption zone with adsorbable gas-enriched product, thereby producing a second purge effluent;
- and
- (e) depressurizing said at least one adsorption zone, thereby producing said adsorbable gas-enriched product.
Dependencies are inferred from the claim text.