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As can be seen in Figure 2.2, more work must be done on the system to produce a given volume of pure species B as the initial mole fraction of species A increases and there is less species B in the feed. Equation (2.18) represents the work required to separate a mixture of gases into pure species A and pure species B. However, a PSA separation system does not generally separate a mixed gas into pure light product and pure heavy exhaust; some of the desired product gas is lost to the exhaust, and the product is generally not composed entirely of the desired gas. In order to extend Equation (2.18) to PSA processes, we must look at the flows through a PSA system and develop the concepts of purity and recovery. Purity is defined as the fraction of the product stream that is made up the desired product gas (in this case species B). Recovery is defined as the fraction of species B in the feed gas that ends up in the product gas. The flows through a PSA system can be seen in Figure 2.3. Feed NF = NFA + NFB PSA Exhaust Product Np=NPA+ NPB NE = NEA + NEB Figure2.3 TheFlowsinandoutofaPSAGasSeparationSystem. 14PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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