Patent ID: 8752390

Claim:
A method for concurrently producing power and H 2 from a gaseous mixture comprising H 2 and CO 2 , the method comprising: feeding the gaseous mixture at super-atmospheric pressure to a first pressure swing adsorption (PSA) system comprising adsorbent that selectively adsorbs CO 2 at said pressure, and selectively adsorbing CO 2 from the gaseous mixture with said adsorbent and at said pressure, thereby obtaining an H 2 -enriched mixture at super-atmospheric pressure; forming a fuel stream from a portion of the H 2 -enriched mixture, combusting said fuel stream and expanding the resulting combustion effluent to generate power; feeding another portion of the H 2 -enriched mixture at super-atmospheric pressure to a second PSA system comprising adsorbent that selectively adsorbs CO 2 at said pressure, and selectively adsorbing CO 2 from said portion of the H 2 -enriched mixture with said adsorbent and at said pressure, thereby obtaining an H 2 product; desorbing CO 2 from the first PSA system, at a pressure lower than said pressure at which CO 2 was selectively adsorbed from the gaseous mixture to form a CO 2 -enriched mixture; and desorbing CO 2 from the second PSA system, at a pressure lower than said pressure at which CO 2 was selectively adsorbed from the H 2 -enriched mixture, to form an H 2 and CO 2 -containing mixture; wherein all or a portion of the H 2 and CO 2 -containing mixture is used as a purge gas for the first PSA system and/or is compressed and recycled to the first PSA system for further separation.