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R.S. Thakur et al. Table 2. Comparison for 95 mol% purity of CO2 Feed SLPM PH atm PI atm PL atm Extract Purity (mol%) Raffinate Purity (mol%) Productivity of CO2 (SLPM/hr.Kg) Productivity of H2 (SLPM/hr.Kg) Table 3. Comparison for 97% purity of CO2 Feed SLPM PH atm PI atm PL atm Extract Purity (%) Raffinate Purity (%) Productivity of CO2 (SLPM/hr.Kg) Productivity of H2 (SLPM/hr.Kg) 3-Bed PSA 19.5 20 0.683 1.55 ~95 95.82 0.0496 0.1991 3-Bed PSA 32 20 0.155 1.45 ~97 99.03 0.0827 0.3378 4-Bed PSA 19.5 20 - 1.43 ~95 94.29 0.0370 0.1470 4-Bed PSA 32.5 20 - 0.5 ~97 99.03 0.0628 0.2573 The simulation results presented in above table 2 and 3 shows that a moderately high productivity can be achieved with 3-Bed PSA compared to 4-bed PSA, thereby minimizing the initial cost as well as operating cost for CO2 separation using PSA technology. The reason for better performance of 3-bed over 4-bed PSA can be understood by analyzing the concentration profiles shown in Figures 3-6 typically for 97 mol% purity of CO2. This figure shows the solid and gas phase concentration profiles at the end of the steps in 3-bed and 4-bed PSA. The shift in the concentration profiles from stripping to enriching step in Figure -5 indicates that large amount of CO2 from the blowdown is circulated to enriching step and this limits the productivity of 4-bed PSA process. Whereas in 3-bed PSA recirculation between depressurization and stripping step is moderate as indicated by the shift in concentration profile between pressurization to stripping in Figure-3. It is observed that as purity requirement is lowered the recirculation amount reduces in both PSA process and their performance becomes almost similar. 7000 6000 5000 4000 3000 2000 1000 0 0 0.5L1 Stripping Blowdown Blowdown Pressurization Figure 3. Variation of amount adsorbed in solid phase with bed length for 3-Bed PSA (97% Purity) International Journal of Advanced Research in Chemical Science (IJARCS) Page 20 q CO2, mol/m3 PDF Image | Separation of CO2 H2 Gas Mixture Using PSA
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