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Figure A.2 represents the corresponding temperature contours during the adsorption stage. The heat of adsorption is released, raising the temperature of the adsorbent locally, where the rate of adsorption is the highest, i.e., at the concentration wave front. While the adsorbent layer temperature increases with the progressing concentration front, it drops in the upstream region as a result of influx of cold feed gas. The cold feed mixture carries the heat away in the upstream locations, while adsorption continues in the downstream locations. This simulation does not consider asymmetric operation of inlet and outlet valves discussed in Chapters 2 and 3 that involves hot water entering the microchannel well before the adsorbent layer is saturated with feed mixture. However, for the sake of comparison of the radially lumped model and 2-D axisymmetric model, only gas-phase simulation is considered and the adsorbent layer response is noted. With the radially lumped model, it is assumed that the adsorbed concentration CA represents a radially integrated value. The diffusion of gases outward in the adsorbent layer is governed by the overall mass transfer resistance, and is assumed to represent the diffusion lag for all the radial calculation points. Therefore, the concentration wave front would have appeared as straight vertical lines in Figure A.1. Figure A.3 shows the effect of using these two approaches on the product purity variation. It is assumed that the product collection starts at the instant the feed gas enters the microchannel and the reference starting point for purity calculation is the same. 171PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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