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It must be noted that with a multistage purification process, the degrees of freedom in the system increase directly with the number of stages and hence, the multistage process performance prediction is highly dependent on the selection of first stage process times, intermediate and final tank pressures, and mixing of gases in the intermediate tanks to maintain a high recovery factor. 3.9 Summary and Conclusions A novel temperature swing adsorption-based natural gas purification cycle using a monolith consisting of adsorbent-coated microchannels is investigated in Chapters 2 and 3. In Chapter 2, the development of a full process simulation model, and selection of geometric parameters and adsorbent and heat transfer fluid were reported. This Chapter develops a comprehensive performance map of the process that involves determination of ranges of product purity, CH4 recovery and process capacity, and energy requirements. The process capacity is found to be up to two orders of magnitude greater than those reported for the adsorbent bed-based PSA systems by Kapoor and Yang (1989) and Olajossy et al. (2003) with a competitive set of product purity and CH4 recovery factors. With a 203.41 s cycle time, and an initial mole fraction of 70% CH4, a range of product purities from 87% to 99% CH4 is possible, simultaneously recovering up to 83% CH4 from the feed stream. Thus, the process capacity and purification performance of the cycle under consideration are found to be better than those of bed-based PSA processes. The energy requirement for the process is found to be 14% of the product combustion potential and by reducing the pressure drop across the microchannel and recovering heat from the cooling stage, this energy ratio can be further decreased to 6%. 96PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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