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Appl. Sci. 2020, 10, 4692 13 of 19 that the amount of CH4 adsorbed along the adsorption bed remains substantially constant through the cycle and slightly high on the top of adsorption bed, as CO2 is first absorbed. Therefore, the proportion of CH4 rises on the top of the adsorption bed and the adsorption amount of CH4 is also increased proportionally. On the other hand, the CO2 load varies significantly during the various phases, as shown in Figure 10. The adsorbed amount of CO2 at the end of the adsorption step is high, but at the blowdown and purge steps, CO2 comes out from the adsorbent due to the regeneration step. This is precisely linked to the kinetic nature of the process. Figure 9. Quantity of CH4 adsorbed along the column at the end of the various phases (cycle 94). Figure 10. Quantity of CO2 adsorbed along the column at the end of the various phases (cycle 94). Figure 11 shows the mole fraction of CH4 along the three-meter length inside the adsorbent bed in the cyclic steady state. In the PR step, CH4 has a low adsorption kinetics and is not adsorbed to the adsorbent at the inlet yet. Therefore, the mole fraction equals 0.55, the same as the biogas feed. The curve shows that the mole fraction of CH4 inside the adsorption bed becomes slightly higher than the biogas along the adsorption bed length. At the AD step, the mole fraction also starts at 0.55, which has the same mole fraction of biogas as CH4, as the adsorbents reaches the equilibrium at the inlet, subsequently causing CO2 to be no longer adsorbed. However, CO2 is adsorbed when moving up to the upper part. Consequently, the CH4 mole faction rises up to more than 0.92. In the DPE step, onlyPDF Image | Biogas Six-Step Pressure Swing Adsorption
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