| 摘要 |
<p>The present invention generally relates to vacuum pressure swing adsorption (VPSA) processes and apparatus to recover CO2 having a purity of approximately =90 mole% from streams containing at least CO2 and H2 (e.g., syngas). The feed (24) to the CO2 VPSA (30) unit can be at super ambient pressure. The CO2 VPSA unit produces three streams, a H2-enriched stream (32), a H2-depleted stream (34) and a CO2 product stream (36). When the CO2 VPSA unit is installed between an SMR/shift reactor (16, 20) and a H2 PSA unit (28), H2 recovery is expected to be increased by extracting CO2, thereby increasing H2 partial pressure in the H2 PSA feed. The recovered CO2 can be further upgraded, sequestered or used in applications such as enhanced oil recovery (EOR).</p> |
