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Chapter 2. Pressure Swing Adsorption Processes Pressure swing (ideal) PL TL TH Pressure PH Figure 2.8: Comparison of pressure swing and temperature swing adsorption for adsorbent regeneration 2. Heating the bed for desorption of impurities 3. Cooling the bed back to the adsorption conditions For heating and cooling operation both, direct means such as using purge/inert gas or indirect means involving heating jackets, coils or microwave can be em- ployed [96, 97]. The key advantage of TSA over PSA is its ability to separate impurities having a tendency to form strong bonding with the adsorbent (chemisorption) [78], as a change of only few degrees in temperature can cause considerable change in the loading amount, leading to an effective separation. Consequently, TSA is usually preferred for purification purposes instead of bulk separation. On the other hand, a major challenge related to the use of TSA is the relative long duration of the processing steps necessary to change the bed temperature, as compared to a PSA system. It should be noted that bed pressure transients can be quickly realized in 42 H: High L: Low Temperature swing (ideal) Solid loadingPDF Image | Operation and Control of Pressure Swing Adsorption Systems
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