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5 CONCLUSIONS AND RECOMMENDATIONS A novel TSA cycle using adsorbent-coated microchannels for natural gas purification was proposed and analyzed. Comprehensive HT/MT/FD models were developed for the adsorption, desorption, cooling, and purge stages of the cycle to investigate species exchange and mass transfer phenomena in the adsorbent layer in a cyclic, steady-state process. Full process simulations were conducted and process performance maps in terms of ranges of gas processing capacity, product purity, CH4 recovery, and operating energy requirements were presented. The process performance was then compared with that of conventional purification systems. Gas adsorption in adsorbent-coated microchannels was experimentally investigated and the adsorbent uptake capacity, adsorption time, and the temperature rise at the adsorption wave front were documented. Laboratory scale models were developed to replicate the experimental procedure. The adsorption time and temperature rise data from the experiments and models were compared to validate the modeling techniques and confirm the feasibility of the process investigated in the present work. Based on these simulations, the times required for satisfactory completion of each of the stages in the cycle were estimated. The optimal adsorbent-coated microchannel geometry was selected after a parametric study on microchannel hydraulic diameter and adsorbent layer thickness. It was concluded that a hydraulic diameter of 530 m, with an adsorbent layer thickness of 30 m resulted in short cycle times of 203 s for the baseline case considered. With the adsorption, desorption and cooling stages executed within ~8 s, the purge stage for a silicalite-water pair was extended for 195 s, to completely dry the 158PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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