# Distillate and Still Compositions for Batch Rectification of a Binary Mixture at a Very Large Reflux Ratio

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Consider a binary mixture with constant relative volatility, , subject to a batch rectification. Initially the binary mixture in the still is equimolar. The rectifying section has stages. A very large reflux ratio is chosen so that the Fenske equation is valid. In such a case, the still and distillate compositions are given by:

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Contributed by: Housam Binous (March 2011)

Open content licensed under CC BY-NC-SA

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For more information, see:

M. F. Doherty and M. F. Malone, *Conceptual Design of Distillation Systems*, Boston: McGraw-Hill, 2001.

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