Shortcut design of extractive distillation columns

Abstract:
Extractive distillation is a common process for the separation of homogeneous azeotropic mixtures. In this process entrainer feed flowrate and reflux ratio of the extractive column represent the crucial design degrees of freedom which govern feasibility and operating cost. In this work feasibility and operational stability of the extractive column is related to the analysis of the nonlinear dynamics of the extractive section. A fully-automated shortcut design method for the simultaneous determination of minimum entrainer feed flowrate and minimum reflux ratio is presented. The application of this method to a ternary and a quaternary example is shown.

Keywords:
Design, Distillation, Extractive Distillation, Shortcut Method, Rectification Body Method.

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