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adsorbent mass. Hence, increase in diameter has a favorable effect on the process performance and a diameter of 530 μm is considered for further analysis. Table 2.5. Effect of microchannel diameter on adsorption stage performance th [μm] 30 Dh Vw×10-8 Mads×10-6 [μm] [m3] [kg] 150 1.13 3.18 200 1.60 4.51 300 2.54 7.17 530 4.71 13.3 Mprod ×10-6 Mprod [kg] [kg kg-1] 1.66 0.52 2.45 0.54 4.63 0.64 11.7 0.88 To analyze the effect of adsorbent layer thickness, th, on process performance, Dh is fixed at 530 μm, while th is varied from 15 to 120 μm. Figure 2.8 shows the results from this parametric study. For a constant Dh, increase in th does not add any benefit to the adsorption stage performance. The product purity starts dropping at nearly same time just after 0.2 s; however, at different rates for different th values, as seen in Figure 2.8(a). For the thinnest adsorbent layer, the adsorbent layer saturates quickly within 0.2 s, while the CO2 adsorbed concentration in the adsorbent layer reaches the highest possible value analogous to the cases shown in Figure 2.8(b). However, as th increases, the feed gas wave front tends to reach the microchannel outlet without completely filling the adsorbent layer. For the thickest adsorbent layer with a th of 120 μm, 34% of the adsorbent layer remains unused as seen in Figure 2.8(b). The dispersed nature of the adsorption wave for thick adsorbent layer is in agreement with the previous experimental findings for the hollow fibers in the literature (Lively et al., 2011; Lively et al., 2012). Additionally, the desorption stage performance with a thick adsorbent layer deteriorates due to an increased mass transfer resistance to the desorbing gases. While the entire adsorbent layer can be saturated and regenerated within 4 s for a th of 15 μm, even 46PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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