Vapor-liquid equilibrium, densities, and interfacial tensions for the system benzene + propan-1-ol

Isobaric vapor-liquid equilibrium data at 50, 75, and 94 kPa have been determined for the binary system benzene + propan-1-ol, in the temperature range 320-370 K. The measurements were made in a vapor-liquid equilibrium still with circulation of both phases. Mixing volumes have been also determined from density measurements at 298.15 K and 101.3 kPa and, at the same temperature and pressure; the dependence of interfacial tension on concentration has been measured using the maximum bubble pressure technique. According to experimental results, the mixture presents positive deviation from ideal behaviour and azeotropy is present at 50, 75, and 94 kPa. The mixing volumes of the system change from negative to positive as the concentration of benzene increases, and the interfacial tensions exhibit negative deviation from the linear behaviour. The activity coefficients and boiling points of the solutions were well-correlated with the mole fraction using the Wohl, Wilson, UNIQUAC, NRTL equations and predicted by the UNIFAC group contribution method. Excess volume data and interfacial tensions were correlated using the Redlich-Kister model.