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particles in the upstream region, the rate of adsorption at local sites is small due to high intraparticle resistance, allowing the CO2 that is not adsorbed in the upstream region to flow toward the downstream region. Although the smaller adsorbent particle size in the downstream region enhances the rate of adsorption, the overall adsorbent uptake is not improved. Therefore, CO2 appears in the outlet stream within 1 s, which is much faster than the observed adsorption time of 2.3 s, although the average slope of the temperature curves remains 4.9°C s-1 as in the case of the linearly increasing particle diameter discussed above. Thus, in this case, despite the particle diameters decreasing to 2 μm toward the outlet, the adsorption rates achieved are only about as good as those seen with particles of diameter 7 μm uniformly spread along the length of the channel. For the third case described above, with an initially decreasing particle size from 7 μm diameter at the inlet to 2 μm diameter at the midpoint of the channel, followed by an increase to 7 μm at the outlet, the temperature variations are shown in Figure 4.17(c). In the upstream region, the larger adsorbent particles hinder adsorption locally, thereby allowing most of the CO2 mass, which should have been adsorbed, to flow downstream. As the particle size decreases toward the axial midpoint of the microchannel, the rate of adsorption improves, the CO2 wavefront decelerates, and the adsorption time increases due to improved adsorbent capacity. Beyond the axial midpoint, the rate of adsorption decreases again, due to increasing particle diameters, resulting in an overall adsorption time of 2.2 s. Therefore, the adsorption stage performance approaches shown in Figure 4.16(c) and (d), which is based on a constant adsorbent size of 2 μm. These predicted local variations provide insights into the effects of the actual particle size distribution in the channels. 147PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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