PHASE-EQUILIBRIA IN BINARY-SYSTEMS AND IN THE TERNARY-SYSTEM OF NORMAL-PROPYL BENZENE, NORMAL-DECANE AND PHENOL

Vapor-liquid equilibria of the binary systems n-propylbenzene+n-decane and +phenol and of the ternary system were measured using a modified Rock and Sieg circulation apparatus at 393.15 and 428.15 K. The position of the binodal curves in the ternary system was determined by means of titration method at 313.15 and 333.15 K. The binary VLE data were correlated using the activity coefficient models Wilson, NRTL and UNIQUAC. The correlations of the binary data and the predictions of the ternary VLE data by means of this models show small deviations with respect to experimental values. Different group-contribution methods (UNIFAC, Modified UNIFAC and GC-EOS) and the Schmidt-Wenzel EOS with chemical theory were used for the prediction of vapor-liquid equilibrium in binary systems and in the ternary system. The accuracy of prediction increases in the order GC-EOS, UNIFAC, Modified UNIFAC, Schmidt-Wenzel method.