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Chapter 2. Pressure Swing Adsorption Processes Feed 1 Feed 2 DEP3 Blowdown Purge DEP1 DEP2 PE1 PE2 Repressurization Figure 2.7: PSA processing steps transition for the first bed shown in Figure 4.3 9. 10. Second counter-current pressure equalization: The pressure inside the column continues to rise as the product end is connected to another column undergoing step 3. Counter-current re-pressurization with product: This is the final stage in the cycle where the column is pressurized with the product coming out of another bed in step2. By the end of this step, the pressure inside the column is at the same level as the feed pressure. 2.5 2.5.1 Temperature Swing Adsoprtion Alternative Options For Gas Separation and Purification In the case of PSA, the adsorbent regeneration operation is performed by low- ering the bed pressure, as the impurities at lower pressure have less affinity for the adsorbent. An alternative way to perform desorption is to raise the bed tem- perature levels, as employed in the temperature swing adsorption (TSA) cycle. Figure 2.8, depicts the comparison between the PSA and TSA cycles for a given adsorption isotherm. A TSA operation usually employs the following three basic steps. 1. Adsorption or production step at low temperature 41PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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