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during the separation process, such as the movement of the concentration shock wave. 4. While keeping the low pressure, pressure ratio, feed mole fraction, and selectivity ratio constant, changing the cycle can greatly change the second law efficiency of the separation. For the example case of oxygen concentration using Zeolite 5A adsorbent (PL = 1 arm, n = 15.6, initial mole fraction yo = 0.78, and selectivity ratio P = 0.582), the second law efficiencies of the Four-Step, Ideal Four-Step, and Ideal Three-Step cycles are 4.18, 32.30 and 43.98%, respectively. 5. As the steps used in the three cycles analyzed within this thesis are typical of the steps in many PSA systems, the principles and equations developed within this model can be applied to other cycles. 6. Graphs of the net work required to separate oxygen using zeolite 5A for the Four-Step cycle and the Ideal Four-Step cycle, as a function of the lower pressure and the pressure ratio, are given in Figures 3.13 and 3.22. 7. Graphs of the second law efficiency of oxygen separation using zeolite 5A for the Four-Step cycle and the Ideal Four-Step cycle, as a function of the lower pressure and the pressure ratio, are given in Figures 3.14 and 3.23. 8. Graphs of the net work and second law efficiency of the Ideal Three-Step cycle are given in Figures 3.29 and 3.30, respectively. When the various parameters are changed the net work and the second law efficiency also change. We first examine the effect of changing the pressure ratio and the lower pressure limit of the cycle. Increasing the pressure ratio increases the recovery 142PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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