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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Table 2.9. Final stage times and total cycle time selected for the full process simulation Stage Adsorption [s] Displacement of gas [s] Desorption [s] Cooling [s] Displacement of liquid [s] Purge [s] Total time [s] Time [s] 0.19 0.52 4.00 3.00 0.70 195.00 203.41 Figure 2.12(a) shows the adsorbed concentration of CH4 and CO2 during the adsorption stage. It can be seen that the CH4 concentration in the adsorbent layer decreases as the adsorption wave front progresses. CO2, on the other hand, diffuses and is adsorbed as it travels through the channel. The feed gas supply is stopped at 0.19 s to prevent contamination of the collected product. It should be noted that the adsorption stage duration affects the CH4 yield and purity. More advanced control of the supply and collection times should yield a broad spectrum of product purity to meet varying end use requirements. 57

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