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Chapter 2. Pressure Swing Adsorption Processes Blowdown Purge Repressurization Feed Repressurization Feed Blowdown Purge Figure 2.2: Two-bed, four-step Skarstrom cycle In particular, the counter-current purge is provided by drawing off a product side stream undergoing adsorption step (see Figure 2.2), making the assembly self-sufficient in terms of any input from the external sources. 2.3.2 Vacuum Swing Cycle A vacuum swing cycle (VSA) while employing exactly the same cyclic steps of Skarstrom cycle, differs from it in terms of using vacuum to regenerate the bed in the purge step, instead of the product itself. As shown in Figure 2.3, during the purge step, the product end remains closed while the feed end is connected to vacuum in order to remove the strongly adsorbed component. Furthermore, the omission of a dedicated product side stream for purging purpose, enhances the product recovery as well. However, this is only achieved at the expense of higher compression cost and is beneficial when the feed pressure is not significantly higher 34PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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