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If we were to plot the mole fraction of the gas phase inside the adsorbent bed as a function of axial displacement, we would find the results plotted in Figure 2.9. Propagation of a Concentration Shock W ave 0.7+ 0.6+ Mole 0.5+ Fraction yH o Figure2.9PropagationofaConcentrationShockWave. The rapid decline in mole fraction is known in the literature as the "concentration shock wave." To the left of the shock wave, the mole fraction is equal to that of the feed, and to the right it is equal to zero. As we visualize the feed gas entering the bed and the shock wave moving through the bed, we begin to see how separation of the gases takes place. The shock wave represents the furthest position in the bed reached by the heavy component, which is being adsorbed as it encounters new adsorbent. Some light component desorbs and joins the light component in the feed. These light component gas molecules continue to move toward the product end of the bed. Due to the adsorption of the heavy component, the velocity of the shock wave is less than the velocity of the gas to the left of the shock wave, and the light component is forced through the shock wave, from low concentration to high concentration. This 0.4+ 0.3 + 0.2+ 0.1 + 0 ti Gas Flow r 0.5 1 Non-Dimensional Axial Displacement {-} 28PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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