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Chapter 2. Pressure Swing Adsorption Processes cost due to the use of expensive adsorbents can also be quite significant. Towards this purpose, adsorbent productivity, defined in Eq. 2.3 is usually measured, which also captures the effective time utilization of the adsorbent under study. Adsorbent productivity = Amount of product component produced per cycle (Amount of adsorbent used)(PSA cycletime) (2.3) 2.3 Types of PSA Cycle A PSA system usually comprises of two or more adsorbent-filled beds intercon- nected to each other via a network of switch valves, which in turn controls the simultaneous operation of product purification and adsorbent regeneration steps. Therefore, a multiple bed assembly is used to ensure a constant supply of prod- uct, while the other beds are in the regeneration mode. The most commonly used PSA configurations are listed next with detailed description. 2.3.1 Skarstrom Cycle This is perhaps one of the most commonly used PSA cycle in practice for small scale gas separation applications. In his original work, Skarstrom [137] employed this for equilibrium based air drying applications. The cycle involves only 2 beds performing the following four basic steps: 1. Cocurrent Pressurization with feed 2. Adsorption with feed 3. Countercurrent blowdown 4. Countercurrent purge with product 33PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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