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at pressures above the atmospheric (PSA), (2) desorb at vacuum conditions (VSA) (3) desorb by increasing temperature (TSA) or (4) by using electricity (ESA), among others.77 In order to assess the validity of the present study for practical applications, we provide next some insights into the understanding of the physical phenomena governing the behavior of the materials when adsorbing the different compounds present in the mixture, while including important equilibrium quantities often used as evaluation criteria in an early stage of design.78 The simplest configuration was considered for the swing adsorption process, including only two fixed beds in parallel, also called the 4-step Skarstrom’s79 cycle. While one bed is adsorbing, the other bed is desorbing (without including heat integration, pressure equalization and purge/rinse steps). The shortcut method described by Chung et al.80 was adopted for the calculations, since it allows a simple description of PSA processes based only on equilibrium parameters obtained on the high and low pressure levels regardless of the rate. Chung et al.’s methodology is extrapolated to VSA and TSA processes in this study, serving as a screening tool in the early stage of the process design. Energy requirements for compression/vacuum, as well as for heating, were included as a way to represent the costs associated in the different processes. Global balances were performed at equilibrium adsorption and desorption conditions (non-differential, as the ones presented in the short-cut methods of Chan et al.81 and Joss et al.82). The adiabatic energy requirement for compression/vacuum was calculated in a similar way as Chaffee et al.83 and Riboldi et al.84 using the following equation: (4) 15PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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