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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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4.11 Efficiencies

Up until now we have always assumed that the stages are equilibrium stages. Stages that are very close to equilibrium can be constructed, but they are only used for special purposes, such as determining equilibrium concentrations. To compare the performance of an actual stage to an equilibrium stage, we use a measure of efficiency.

Many different measures of efficiency have been defined. Two that are in common use are the overall efficiency and the Murphree efficiency. The overall efficiency, Eo, is defined as the number of equilibrium stages required for the separation divided by the actual number of stages required:

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