A Nonequilibrium Model of Distillation Stage with Possible Occurrence of Two Liquid Phases

Abstract

A model of the rectification column stage is proposed in which the possible splitting into two liquid phases may occur. For this case, the equilibrium stage concept has hitherto been employed in the literature. In this work it is shown that even in this situation, it is possible to use, under certain simplifying assumptions, the up-to-date nonequilibrium stage concept. For solving the proposed model, a global approach is suggested with retaining the problem dimension regardless of the number of coexisting liquid phases