Recovery of CO2 and H2 from PSA offgas in an H2 plant

A gas separation apparatus, comprising:

• a first pressure swing adsorption (PSA) unit that receives a feed gas comprising at least a first component and a second component, wherein the first PSA unit produces a first product gas predominantly comprising the first component, and a first offgas comprising at least some of the first component and at least some of the second component;
• a compressor fluidly coupled to the first PSA unit that compresses the offgas to form a compressed offgas;
• an absorber unit downstream of the compressor that employs a solvent to remove at least part of the second component from the compressed offgas to form an enriched compressed offgas that is at least partially depleted from the second component;
• a second PSA unit that receives the enriched compressed offgas and produces a second product gas predominantly comprising the first component, and a second Offgas;
• and further comprising a flash unit that regenerates the solvent and produces a stream of concentrated second component.