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encounter a counteracting force that could prevent this refrigerant transfer). The physical effect of surface tension forces in terms of HTF ingress into the adsorbent layer can manifest after substantial mass of gases leaves the adsorbent layer by diffusing through the adsorbent layer, followed by getting dissolved in the liquid HTF. The present model takes the different modes of mass transfer into account to accurately model the species diffusion in gases and liquids. The HTF is not modeled as a mixture component, and conservation of CH4 and CO2 is targeted. This approach enables full process simulation without addressing HTF ingress in the adsorbent layer. The interaction of HTF and adsorbent layer in presence of surface tension forces should be investigated in detail in future, using flow visualization and other relevant techniques to characterize the desorption stage phenomenon in the adsorbent layer. Nevertheless, the full process model does consider that due to a combined effect of surface tension forces and impurity removal from the adsorbent layer, the adsorbent layer is completely filled with liquid HTF at the end of the cooling stage, and this liquid must be removed, so that a fresh batch of impure gas can be sent for purification. Modeling techniques used to predict the time required for liquid HTF removal are discussed in a subsequent section. 32PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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