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temperature swing of 175°C, the adsorbent swing capacity is up to 95% of the maximum adsorbent capacity (from point S to C). However, with a reduction of temperature swing to 75°C and 25°C, the adsorbent swing capacity decreases to the distance from points S to B and S to A (39% and 18% of the swing in the baseline case with 175°C), respectively. Therefore, with a desorption temperature of 50°C, up to 85% of the sensible energy can be saved; however, the adsorption capacity drops to 18% of the capacity with a desorption temperature of 200°C. This results in negligible product purity increment over the feed gas as shown in Figure 3.8(b), which shows the energy ratio-product purity curves for the maximum product collection times for a given feed time, as illustrated in Figure 3.3(b). Marginal improvement in product purity is possible by using a shorter adsorption stage, but the total process capacity is reduced by a substantial margin, negating the predicted compactness and high process capacity of the purification cycle illustrated in Figure 3.4. Thus, it is concluded that reducing the available temperature swing is not a viable option for reducing the total energy required, as it considerably deteriorates process performance without commensurate benefits. 83PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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