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Table 2.10. Single-point process performance comparison with the literature Parameter Present Study CH4 Molar Purity [%] 90 CH4 Mass Recovery [%] 82 Process capacity 9118 [LSTP kg-ads-1 hr-1] Kapoor and Yang (1989) 82-95 40-94 < 121 Olajossy et al. (2003) 86-98 86-93 < 167 Pahinkar et al. (2016) ~ 97 > 94 < 2750 It must be noted that the calculations presented in this section refer to a single adsorption stage time based on the criteria shown in Table 2.2. A comprehensive investigation of the purification cycle is reported in Chapter 3, wherein further improvements in the process performance through variation of stage times and heat and mass recovery are also reported. 2.5 Conclusions A novel TSA process cycle involving adsorbent microchannels for natural gas purification is proposed and the underlying fluid dynamics and heat and mass transfer are analyzed computationally. Comprehensive HT/MT/FD models are developed for the adsorption, desorption, cooling and purge stages of the process cycle to investigate species exchange and adsorption phenomena in the adsorbent layer in a cyclic steady state process. It is found that the adsorption stage is fast, resulting in adsorbent layer saturation within 0.2 s as a result of the convection-governed process, unlike the diffusion-governed process in the case of adsorbent beds. Due to the presence of two different phases in the microchannel during the desorption stage, species exchange is subjected to varying mass transfer resistances. Nevertheless, the desorption stage does not take more than 4 s for a near complete regeneration of the adsorbent layer. As a result of the small thermal mass 65PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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