Phase Liquid–Vapor Equilibria and Thermodynamic Properties of Solutions of Binary Systems of N-Propylbenzene–N-Alkylbenzenes

The phase equilibria of liquid–vapor solutions of four binary systems formed by n -propylbenzene and n -alkylbenzenes have been studied. It has been established that the contributions of intermolecular interactions to the Helmholtz energy for solutions of constant molar concentrations formed by n -propylbenzene and n -alkylbenzenes linearly and fractionally depend on molar mass of n -alkylbenzene in the homologous series. The corresponding equations have been derived.