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1858 3. Results and discussion 3.1 Adsorption isotherms of 13X-Ca and AC5-KS The adsorption isotherms of CO, CO2 and H2 on 13X-Ca and AC5-KS were measured by Lopes et al. (2009, 2010). The adsorption data were fitted by employing the extended Langmuir-Freundlich isotherm equation in this study. The fitting parameters are detailed in Table 3. Table 3: Langmuir-Freundlich isotherm fitting parameters of CO, CO2 and H2 on 13X-Ca and AC5-KS CO ai,1(mole/Kg) ai,2(mole/K‧Kg ) bi,0(1/bar) bi,1(K) ni,1(-) ni,2(K) CO2 ai,1(mole/Kg) ai,2(mole/K‧Kg ) bi,0(1/bar) bi,1(K) ni,1(-) ni,2(K) H2 ai,1(mole/Kg) ai,2(mole/K‧Kg ) bi,0(1/bar) bi,1(K) ni,1(-) ni,2(K) AC5-KS 16.4 4.47 x10-5 9.397 x10-5 2.292 x103 1.599 -277.975 25.1 -4.18 x10-2 9.719 x10-5 1.856 x103 1.675 -275.04 6.57 3.70 x10-2 4.338 x10-6 1.913 x103 2.652 -527.941 13X-Ca -1.36 2.32 x10-2 9.36 x10-4 1.583 x103 2.63 x10-1 79.505 1.64 1.33 x10-2 6.566x10-5 3.204x103 -1.218 576.276 -0.649 1.96 x10-2 6.797 x10-6 2.042 x103 1.43 -158.364 3.2 Dual-bed 8-step PSA process simulation In this study, the optimal operating conditions are discussed by varying the operating variables, such as feed pressure and bed length. Bed length at H2-PSA: All the operating variables are fixed except bed length. The amount of adsorbent increases when bed length increases. Figure 3 shows that as bed length increases, the H2 recovery decreases since the hydrogen flow to the top product decreases. At the same time, the CO2 flow to the top product decreases, so that H2 purity increases. When the amount of adsorbed gas increases, the gas flow to the bottom product increases during desorption. The CO2 purity in the bottom product decreases since the recovery of H2 increases in the bottom product. (a) (b) 99.99 99.98 99.97 99.96 99.95 99.94 99.93 99.92 83 82 81 80 79 78 77 76 600 650 700 750 Bed Length(cm) 800 H purity 2 H recovery 2 0.06 0.05 0.04 0.03 0.02 0.01 0.00 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 600 650 700 Bed Length(cm) 750 800 CO purity 2 CO recovery 2 Purity(%) Recovery(%) Purity(%) Recovery(%)PDF Image | Carbon Dioxide Capture and Hydrogen Purification PSA
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