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Table 2.2: Table of Equilibrium, Delivery, and Differential Loadings for CO2 . Loadings Using Only 5A Zeolite (mol/kg sorbent) Stage 1 Equilibrium @ 200◦C, 47 mmHg Stage 1 Feed @ 25◦C, 1.9 mmHg Stage 1 Differential 0.0637 0.67 Stage 2 Equilibrium @ 2.45 0.606 Loadings Using 5A Zeolite for Stage 1 and NaY Zeolite for Stage 2 25◦C, 47 mmHg Stage 2 Outlet @ 200◦C, 1000 mmHg 0.662 Stage 2 Differential 1.79 (mol/kg sorbent) Stage 1 Equilibrium @ 200◦C, 152 mmHg Stage 1 Feed @ 25◦C, 1.9 mmHg Stage 1 Differential Adsorbent modeling Stage 2 Equilibrium @ 2.37 0.172 0.67 0.498 2.3 Discussion 25◦C, 152 mmHg Stage 2 Outlet @ 0.491 Stage 2 Differential 1.88 200◦C, 1000 mmHg The adsorption of CO2 onto 5A zeolite was measured gravimetrically using a Cahn balance and modeled using equation 2.1. Figures 2.2 and 2.3 show measured adsorption equilibrium data along with corresponding fit isotherms for various tem- peratures. These demonstrate that the multi-temperature Toth isotherm describes the adsorption equilibrium well for modeling purposes. [Note the single data point in Figure 2.2 at low loading that is far removed from the fitted curve. This point is likely not accurate, with the error caused by inaccuracy in the pressure measurement or a lack of attainment of equilibrium.] Adsorption bed sizing Using a basis removal rate of 4 kg/day and a 60 min half cycle, the amount of CO2 needed to be removed per cycle was calculated to be 167 g. The loadings 12PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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