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recovery obtained with the structured adsorbents is higher than that obtained with the packed bed. This is directly related to the sharpness of the mass transfer front during the feed step. The sharper front for the structured adsorbents results in less breakthrough of CO2 during step 1 and therefore a higher recovery in the product stream. The CO2 recovery is a function of CO2 working capacity (WC) which decreases as cycle time decreases. As evident from Figure 12, in the case of C5400 and C5900 adsorbents, a decrease from 86 % to 75 % and 90 % to 80 % occurs respectively when cycle time is decreased from 205 to 15 s, while in the case of 13X pellets, the recovery only reaches 80 % for long cycle times. Longer cycle time gives higher purity and recovery because the lower resulting velocities lead to sharper mass transfer zones. The recovery could be improved by replacing the 3-step cycle with a more complex cycle incorporating product rinse and pressure equalisation. However, the scope of the present work was not to optimize system performance but rather to explore and illustrate the advantages and disadvantages of structured adsorbents versus conventional adsorbent beads. The specific productivity (throughput) of adsorbents at different cycle times is presented in Figure 13. The throughput attainable in a given volume of vessel in a cyclic adsorption system may be expressed as throughput (TPD) gas _ production cycle cycle mads day specific productivity f WC where WC is adsorbent working capacity (moles/kg adsorbent/cycle), mads is the mass of adsorbent, is the cycle time (s/cycle) and f is a proportionality constant. As expected, all three adsorbents displayed a hyperbolic pattern for productivity as a function of cycle time as suggested by the above equation. The throughput is highest for a packed bed because of the higher zeolite loading per unit volume. However, the structured adsorbents follow the 126PDF Image | Structured Zeolite Adsorbents for PSA Applications
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