Thermodynamics of associated solutions. Excess thermodynamic properties of liquid mixtures of some organic compounds with amines

Abstract

The UNIQUAC associated-solution model reproduces successfully the vapor pressure isotherms of binary aliphatic amine-saturated hydrocarbon mixtures by use of smaller values of the association constant for aliphatic amines than those given by Brandani. In the correlation of vapor-liquid equilibrium and excess enthalpy data for amine-alcohol mixtures, two cases are studied for solvation equilibria between these two self-associating components (A, B). In vapor-liquid equilibrium data reduction, for aliphatic amine-alcohol mixtures, a single solvation model forming A i B j complexes gives better results than a multisolvation model forming copolymers such as (A i B j ) k , (A i B j ) k A l , A i (B j A k ) l B m , etc., and for aniline-alcohol mixtures the latter is better than the former. In excess enthalpy data reduction, both models give very similar results.