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a partly filled 120 μm thick adsorbent layer cannot be regenerated within 20 s as seen in Figure 2.8(b). Such behavior can be attributed to the convection-based design in the present study, where the diffusion in the adsorbent layer in the radial direction must be fast enough to match the feed gas convection in the axial direction in the microchannel. Thinner adsorbent layers can exhibit such behavior, as a result of lower mass transfer resistance within the adsorbent layer. It is found that mass transfer resistance through the adsorbent layer is up to ten times greater than the convection mass transfer resistance at the adsorbent layer wall. Therefore, employing a thin adsorbent layer reduces the overall mass transfer resistance by a significant margin. For thick adsorbent layers, diffusion in the adsorbent layer lags convection in the microchannel, contaminating the product before saturating the adsorbent layer. The reduced slope of the purity curve for a th of 120 μm, as shown in Figure 2.8(a), indicates that CO2 starts to enter the outlet stream after 0.4 s, while the adsorbent layer is not saturated with CO2 entirely; and even after 1.5 s, only 66% of the adsorbent layer is filled with CO2. For thinner adsorbent layers, the time required for adsorbent layer saturation matches the time required for the fluid breakthrough of CO2 closely. For useful operation of this cycle, the cycle times should therefore be based on convection time scales and not diffusion time scales. 47PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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