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Figure2.5TotalProductPressurevs.PurityforconstantO2PartialPressureof3atm. The work equation in this case becomes: wrev ~ RT0 NpAm\ V-yP) VJV (2. ypi \ f +NpBln +NEAln +NEB\n The graph of this equation can be seen in Figure 2.6 for the case of oxygen concentration (yo = 0.78). More work is now required at low purity than at high purity. This is because at low purity, although little separation work is required, a lot of nitrogen leaves the system as product at pressure Pp. This is exaggerated by the increase in total pressure at low purity necessary to maintain the product oxygen partial pressure. The minimum reversible work required per litre of O2 occurs at approximately 60 to 70% purity, and depends slightly on recovery. 18PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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