Heterogeneous Nonequilibrium Mole Fraction Curve Maps

Abstract

A strategy for drawing mole fraction curve maps for heterogeneous mixtures, using the nonequilibrium model that involves rigorous mass-transfer calculations, is presented. The calculations involve the use of rigorous stability analysis in the form of the Gibbs tangent plane criterion and nonequilibrium liquid-liquid calculations when the mixture is determined to be unstable. This is followed by a nonequilibrium bubble-point calculation. A comparison of the equilibrium and nonequilibrium mole fraction curve maps for the mixture of ethanol, benzene, and water is presented.

Nonequilibrium Reactive Mole Fraction Curve Maps

“…10 This approach is used by Taylor et al 14 for the nonreactive separation case to calculate equilibrium RCM and composition trajectory maps (CTM) considering mass transfer effects. Sridhar et al, 15,16 addressed departures from equilibrium to draw nonequilibrium composition trajectories and locate azeotropes. They conclude that the stationary points of these models are the same, but nonequilibrium modeling is necessary to compute distillation boundaries.…”