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Chapter 2. Pressure Swing Adsorption Processes In this stage the inlet to bed remain closed and outlet is now connected to another bed which has just finished counter current depressurization. The pure product coming out of the bed acts as an excellent source of purge stream for the other bed (step 7). Consequently, the system dependence on the external supply of product stream is further reduced. 5. Third co-current depressurization: The column continues to depressurize itself and is now connected to another column at lower pressure which has just finished purge step (step 8), in order to fully utilize the pure product gas at the product end to pressurize other columns. 6. Counter current depressurization: This is the blowdown stage, where the feed end is now opened to a lower pressure sink and the product is closed. During this stage the impurities, which are most concentrated near the feed end gets desorbed and leaves the column as an off gas, thus bringing adsorbent bed regeneration. 7. Counter current purge: The feed end still remains open to a low pressure sink, while the product end is now connected to a bed which has just finished first co-current de- pressurization (step 4). The pure product stream entering the bed at low pressure sweeps away the remaining impurities. 8. First counter-current pressure equalization: The column feed end is now closed and the product end is connected to another column undergoing step 5. Consequently, the pressure inside the bed starts rising. 40PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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