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The pressure swing adsorption process is divided into four stages that occur in cycles: 1. Adsorption: adsorption takes place at high pressure (up to 40 bar). The feed gas is fed through an adsorbent bed. The absorbent binds the easily absorbable gas mol- ecules, while gas molecules that are not readily absorbable or not absorbable at all pass through the bed. The absorbent bed continues to absorb gas molecules until it reaches its full capacity. 2. Depressurization: depressurization is the first regen- eration (desorption) step of the full absorbent bed. As the pressure drops, the gas molecules in the adsorbent bed are released and the target gas is discharged from the absorber vessel. 3. Purging: the adsorbent bed is purged with the target gas to fully regenerate it. 4. Repressurization: the absorber is pressurized using a feed gas mixture or the target gas until the process condi- tions for adsorption have been restored. Usually, four to five adsorption vessels are combined so that the PSA process can run continuously. While adsorption oc- curs in one vessel, the regeneration process and repressur- ization take place in the other vessels. 7 © Caloric Anlagenbau GmbHPDF Image | Pressure Swing Adsorption
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