Shortcut methods for nonideal multicomponent distillation: 1. simple columns

Abstract:
In process design shortcut methods are a prerequisite for the fast evaluation of alternatives. In this paper the rectification body method (RBM) for the calculation of the minimum energy demand of homogeneous, azeotropic multicomponent distillation processes is presented. The new method incorporates both the classical Underwood technique and certain previously proposed techniques as special cases. It employs all pinch point branches of both column sections and thus requires no a--priori selection of active pinch points. It is entirely general and can be applied to any type of split of nonideal and azeotropic mixtures irrespective of the number of components. Hence, it significantly extends previous results and practical applicability. Its features are highlighted through examples of nonideal separations with three, four, and five components.

Keywords:
Minimum reflux, azeotropic distillation, pinch points, geometric criterion, shortcuts.

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