How does a Pressure Swing Adsorption (PSA) system work?

PSA exploits the pressure dependence of adsorption - more gas adsorbs at high pressure. The cycle has: Adsorption step (high pressure, target component adsorbs), Blowdown (pressure reduced, adsorbed gas released), Purge (low pressure, remaining adsorbate removed), and Repressurization. Multiple beds operate in sequence for continuous production. Applications include hydrogen purification (from SMR), oxygen from air, and natural gas upgrading.