16.8 Rate-Based Analysis of Distillation

For binary distillation, the equilibrium stage analysis of distillation can be made to agree quite well with experimental results by predicting a Murphree efficiency for each stage in the column (Section 16.6). Commercial simulators will include efficiency calculations. Unfortunately, for multicomponent distillation, the Murphree efficiencies are, in general, not equal. To fit experimental results, it is sometimes necessary to use negative values for the Murphree efficiency. This is not satisfactory and is a sign that the assumption of equilibrium stages is not appropriate for this particular multicomponent distillation. A more fundamental analysis based on mass- and heat-transfer rates on each stage ...

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