The uniquac associated-solution theory: vapor-liquid equilibria of binary systems containing one associating and one inert or active component

Abstract

Brandani, V. and Evangelista, F., 1984. The UNIQUAC associated-solution theory: vapor-liquid equilibria of binary systems containing one associating and one inert or active component. Fluid Phase Equilibria, 17: 281–302. This article critically reconsiders UNIQUAC associated-solution theory, clearly identifying the physical approximations of the model. Data for binary vapor-liquid equilibria are correlated with this theory using pure-liquid association parameters determined by the method described in a preceding paper. For alcoholic systems, fitting of only two (inert component) or three parameters (active component) to the experimental data gives good improvement over the results from the original UNIQUAC equation. However, in the case of amine systems with inert components, such as saturated hydrocarbons, the UNIQUAC associated-solution theory fails unless a solvation effect is considered empirically.