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adsorbent is heated to the desorption temperature, more gaseous CO2 accumulates in the void spaces and increases the total pressure, aiding quick removal of the gases. A wave of rising CO2 pressure can be observed in Figure 2.12(b) in the form of a distinct concentration peak followed by a rapid loss of mass in upstream regions. CH4 density, however, falls rapidly without any local peaks as the amount of CH4 adsorbed in the previous stage is small compared to that of CO2. Figure 2.12(c), which shows the corresponding adsorbed concentrations, indicates a continuous decrease in the adsorbed concentrations of both gases. It is also interesting to note that the residual feed gas gets adsorbed into the adsorbent downstream while the desorption process has started in the upstream adsorbent as a result of selection of premature termination of feed to prevent product contamination. Figure 2.13(a) shows the progress of gas removal from the adsorbent layer during the extended desorption stage. The CO2 desorption wave in the form of a gas density peak, which initiates with the start of the displacement stage and reaches the axial midpoint of the microchannel at 0.71 s, reaches the outlet in about the next 0.5 s. Continued decrease in both gas densities is seen as a result of slow diffusive flow afterwards, which is a result of the change in the mode of mass transfer from advective- diffusive to diffusive. As the desorption stage concludes at 4.71 s, CH4 density in the adsorbent layer is negligible, while CO2 density remains below 5% of the initial value at the start of desorption. Similar patterns are observed for the adsorbed concentration graph shown in Figure 2.13(b). The adsorbed concentration levels of both the component gases fall uniformly as a result of desorption from the adsorbent pores and removal from the void spaces through diffusion. The residual adsorbed concentration of CO2 at the end of 59PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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