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The adsorption stage times for both the pairs are comparable and are dependent on the adsorbent swing capacity for silicalite and zeolite 5A. It should be noted that the adsorbed CO2 after the purge stage is already high, because of the high CO2 mole fraction in the product, and the purge stage in fact involves purification of the product gas. Therefore, enough CO2 from the feed stage cannot be accommodated in the adsorbent layer, especially in zeolite 5A. This is attributed to the reduced operating capacity at a reduced temperature swing of 75°C. At the end of the adsorption stage, the CO2 adsorbed concentrations for zeolite 5A and silicalite rise from the equilibrium desorbed values at the start to the values at A and D, respectively. Table 2.8. Comparison of stage times with silicalite-water and zeolite 5A – PAO for a temperature swing of 75°C Stage Zeolite 5A - PAO Adsorption [s] 0.16 Displacement 1.40 of gas [s] Desorption [s] 5.00 Cooling [s] 23.00 Displacement 5.00 of liquid [s] Purge [s] 320400 Total time [s] 320434.56 Silicalite - Water 0.19 0.55 5.00 3.00 0.70 195.00 204.44 The desorption stage time is kept constant at 5 s for both the HTFs to assess desorption effectiveness. The desorption stage time with silicalite-water pair with Tdeso of 200°C discussed in the previous section is 4 s with a 95% regeneration. However, the desorption stage time with Tdeso of 100°C should be higher than 5.5 s. As shown in Figure 2.11(a), water is able to raise the temperature of the adsorbent layer within 3 s, while the temperature rise with PAO is slower and not all the axial locations reach 100°C after 5 s. 53PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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