Thermodynamic characterization of second generation biofuels: Vapour–liquid equilibria and excess enthalpies of the binary mixtures 1-pentanol and cyclohexane or toluene

The paper reports accurate experimental data of vapour–liquid equilibria at T = 313.15 K, using an isothermal total pressure cell, for the binary systems (1-pentanol + cyclohexane) and (1-pentanol + toluene). The data were correlated using Margules, Wilson, NRTL and UNIQUAC equations. Also, the enthalpies of mixing were measured for the same systems at two different temperatures T = (298.15 and 313.15) K using an isothermal flow calorimeter and the excess enthalpies were correlated by the Redlich–Kister equation. The thermodynamic behaviour of both systems is discussed.

► VLE and HE measurements are reported for the binary mixtures 1-pentanol and cyclohexane or toluene.
► The experimental data were correlated using well-known models.
► A positive deviation from the ideal behaviour is observed for both systems.