TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION

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TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION ( temperature-swing-adsorption-processes-for-gas-separation )

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Figure 2.14. Progress of liquid water removal from the adsorbent layer The integrated adsorbed concentration of CO2 in the adsorbent layer varies over two entire cycles as shown in Figure 2.15. Two consecutive cycles are considered to explain the cyclic steady state of the process with the operating capacity of the adsorbent ranging from point A to C. A partial increase in adsorbed CO2 concentration during the purge stage results in purification of product gas (up to point B) without any feed, while a further increase in adsorbed concentration is observed during the feed/adsorption stage as more CO2 enters the microchannel for separation (up to point C). An insignificant re- adsorption of trapped CO2 during the cooling stage is also observed (just before point A). As explained previously, the precise rate of regeneration of the adsorbent layer during the purge stage is difficult to determine. Nevertheless, the dotted lines shown in Figure 2.15 represent a possible pattern of variation of adsorbed concentrations, as water is removed from the adsorbent layer. 62

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