Collect. Czech. Chem. Commun. 1979, 44, 808-822

Simultaneous correlation of vapour-liquid equilibrium and heats of mixing and prediction of excess heat capacities. The systems benzene-n-alcohols and cyclohexane-n-alcohols

Vladimír Dohnal, Jaroslav Vinš and Robert Holub

Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


The Wilson, the enthalpic Wilson and the Orye equations were used for the simultaneous correlation of extensive data sets on VLE and heats of mixing of eight binary systems hydrocarbon-n-alcohol, viz. benzene-methanol, -ethanol, -n-propanol, -n-butanol, cyclohexane-ethanol, -n-propanol, -n-butanol and n-heptane-ethanol. The expected quadratic temperature dependence of parameters of these equations makes a good simultaneous description possible of excess free enthalpy and heat of mixing as a function of temperature. The Wilson equation gives demonstrably the best description of the experimental data. All the equations were as well used to predict excess heat capacities for the systems listed and the confidence intervals were estimated for the predicted results. The comparison with experimental data for four of these systems shows that the predicted excess heat capacities are in general in good agreement with the experiment; however, the Wilson equation yielded again the best results.