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Energy Efficiency of Gas Separation Pressure Swing Adsorption

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Energy Efficiency of Gas Separation Pressure Swing Adsorption ( energy-efficiency-gas-separation-pressure-swing-adsorption )

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1 Figure2.4ReversibleWorkdoneBytheSysteminConcentratingOneLitreOfOxygenFromAir. We now extend the reversible work calculation to the case in which the product partial pressure of species B must be kept constant and greater than atmospheric. This is true when the product is used in a chemical reaction in which the rate is dependent on the partial pressure of the reactants. A n example of this is the dissociation of O2 at the cathode of a fuel cell. Another example is the combustion of fossil fuels. Holding the partial pressure of species B constant implies that at low purity, the total product pressure is high, while at 100% purity, the total product pressure is the partial pressure of species B. A graph of total product pressure Pp vs. purity can be seen in Figure 2.5, in which the partial pressure of species B is kept at three atmospheres. 17

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