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Chapter 2. Pressure Swing Adsorption Processes Blowdown Vacuum Repressurization Feed Repressurization Feed Blowdown Vacuum Figure 2.3: Two-bed, four-step vacuum swing adsorption cycle than the atmospheric pressure. 2.3.3 Rapid Pressure Swing Cycle Rapid pressure swing adsorption (RPSA) cycle is one of the simplest version of PSA cycle, and involves only a single bed undergoing the following two steps: 1. Cocurrent pressurization with feed - adsorption step 2. Depressurization step The basic idea behind RPSA is to improve the adsorbent productivity (Eq. 2.3) by reducing the overall cycle time. In the first step, both repressurization with feed and adsorption with feed, are lumped together, leading to a overall shorter duration processing step in order to ensure desired product purity. In the next step, as shown in Figure 2.4 the product recovery continues along side the impurity removal at the feed end, as the pressure inside the bed reduces. 35PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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