Vapor-liquid equilibrium curve for the ethanol-water system

Vapor-liquid equilibrium curve for the ethanol-water system 

The residue curve map graphs the liquid composition paths that are solutions to the following set of ordinary differential equations  

A residue curve map of the propyl amine-acetonitrile-water system. 

Despite the advances in the thermodynamics for predicting azeotropic mixture, feasible distillation boundaries, and sequence of cuts, the azeotropic batch distillation system is still incipient in terms of design, optimization, and optimal control. 

Solution Since the curve from propyl amine to the ACN-water azeotrope is distillation barrier, there are two distillation regions in this system. For the left distillation region, the product sequence is propyl amine, ACN-water azeotrope, and water. For the right region, the sequence is propyl amine, ACN-water azeotrope, and ACN. This example shows that conventional distillation caimot obtain pure water and pure ACN cuts at the same time. 

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