The boiling points and vapor phase compositions of two binary n-hexane-phenol and benzene-phenol systems were measured according to liquid compositions at 1 atm.
The vapor-liquid equilibrium data of those binary systems were known to be consistent by the thermodynamic consistency test, and the parameters in the model were estimated by correlating the binary vapor-liquid data with the UNIQUAC model, and those binary interaction parameters were extended to predict the ternary vapor-liquid equilibria and solvent selectivity by extractive distillation.
The boiling points and compositions of the vapor phase for ternary systems were measured according to varying the concentration of phenol used as solvent in a binary n-hexane-benzene system forming the azeotropic mixture at 1 atm, and the experimental data were compared with values predicted by the binary interaction parameters.
And the experimental relative volatilities for the n-hexane-benzene system with solvent and without solvent were also compared with calculated values.