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CO2 and N2 on 13X zeolite was obtained using the micromeritics ASAP 2010 for three different operating temperatures. The mass transfer coefficients of CO2 and N2 was obtained using the rapid pressure swing apparatus (RPSA). In these simulations one parameter mass transfer coefficient with energy balance was used. The main heat transfer resistance is between the solid and gas phase inside of the column wall. In order to remove the heat transfer of the wall and outside the wall thickness was considered negligible. The heat transfer coefficient was obtained by fitting the temperature profile of the bed of a pure N2 purge run. Heat transfer and mass transfer coefficients were not changed in any simulation. Only the valve coefficient of different steps was changed in order to match the pressure history of the bed during a complete cycle. In Figure 4.5, the model predicted pressure profile of the bed was plotted against the experimental pressure profile of the bed-1 at the periodic state for the entire PSA cycle of run E-1. The PSA cycle consists of 7 steps namely feed step (F), heavy reflux step (HR), pressure equalization down step (E), counter-current blowdown step (CnD), light reflux step (LR), equalization step up (E*) and light product pressurization step (LPP). The experimental data was represented as the open circle whereas the solid line shows the model prediction. As it can be seen from the figure the DAPS can predict exactly the experimental pressure profile of the bed. It is very important to have a correct estimation of the individual component isotherms, mass transfer coefficients and heat transfer coefficients. The pressure profile was matched only adjusting the respective valve coefficients of each step no other parameter was adjusted. 29PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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