Vapor–liquid equilibrium of octane-enhancing additives in gasolines: 3. Total pressure data and gE for ternary mixtures containing di-isopropyl ether or benzene and n-heptane + cyclohexane at 313.15 K

New experimental isothermal P–x data at T=313.15 K for two ternary systems (di-isopropyl ether, (DIPE)+n-heptane+cyclohexane) and (benzene+n-heptane+cyclohexane) are reported. Data reduction by Barker’s method provides correlations for gE. The Wohl’s expansion, as well as Wilson, NRTL and UNIQUAC models have been applied sucessfully to the ternary systems.