Explicit equation to calculate the liquid-vapour equilibrium for ternary azeotropic and non azetropic systems

Abstract

A new set of explicit equations to calculate the composition of a vapour in equilibrium with a given liquid mixture at given pressure, and its bubble temperature has been developed. The proposed equations have been applied satisfactorily to different type of ternary liquid-vapour equilibriums and can be of great interest in complex calculations such as optimal design of multicomponent distillation columns, distillation column sequences and distillation boundaries in azeotropic systems. The explicit equations allow the direct calculation of the vapour composition and bubble temperature, thus avoiding the need of iterative calculations and the corresponding convergence problems associated to the solution of the typical set of non-linear equations involved in such problems.