Targeting sidestream compositions in multicomponent nonideal distillation

Abstract:
Distillation columns comprising a sidestream can provide a simple means of process integration for certain cases. However, for the design of sequences involving sidestream columns, the computational expenditure of rigorous models becomes prohibitive and suitable shortcut techniques are required for a fast screening of design alternatives. While for ideal mixtures a comprehensive suite of such shortcut techniques is available, no such techniques accounting for sidestream columns are available for nonideal mixtures. In this paper a shortcut technique is presented which allows to tackle two design cases for highly nonideal and azeotropic mixtures.

Keywords:
Sidestream columns, minimum reflux, nonideal distillation, limiting sidestream purity, thermodynamic optimal separation.

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