Korbinian Krämer, Andreas Harwardt, Wolfgang Marquardt:
A novel shortcut method for the design of heteroazeotropic distillation of multicomponent mixtures
FOCAPD 2009 (Foundations of Computer-Aided Process Design), Breckenridge, Colorado, USA, 7-12.06.2009
Shortcut methods are a valuable tool in the early stages of chemical process design, where numerous flowsheet alternatives need to be evaluated to determine the most energy-efficient, feasible flowsheet. Various shortcut methods based on tray-to-tray calculation and pinch point analysis for the inspection of feasibility and the determination of the minimum energy demand for homogeneous azeotropic distillation have been published in the literature. For multicomponent heteroazeotropic distillation, however, no generally applicable shortcut methods have been presented so far. Based on the existing shortcut methods for homogeneous distillation, a shortcut method for heteroazeotropic distillation, the feed pinch method (FPM) is proposed in this work. The FPM is based on rigorous thermodynamics, applicable to heterogeneous azeotropic mixtures of any number of components and can be automated. The new method is illustrated by several examples of ternary as well as quaternary heteroazeotropic separations, for which feasibility and minimum energy demand is determined with paramount robustness and efficiency.
Heteroazeotropic distillation, Shortcut method, Feed pinch method, Rectification body method