Thermodynamic behaviour of second generation biofuels: Vapour–liquid equilibria and excess enthalpies of the binary mixtures 2-pentanol and n-heptane or 2,2,4-trimethylpentane

• VLE and HE measurements are reported for the binary mixtures 2-pentanol and isooctane or heptane.
• The experimental data were correlated using Redlich–Kister, Margules, Wilson, NRTL and UNIQUAC.
• A positive deviation from the ideal behaviour with an azeotrope is observed for both systems.
• An endothermic effect is observed when the 2-pentanol is mixed with the hydrocarbons.

Accurate experimental data of vapour–liquid equilibria (VLE) and excess enthalpies are reported for the binary systems (2-pentanol + 2,2,4-trimethylpentane) and (2-pentanol + n-heptane). An isothermal total pressure cell was used for measuring the VLE at T = 313.15 K. The data were correlated using Margules, Wilson, NRTL and UNIQUAC equations. The excess enthalpies were measured at two different temperatures T = (298.15 and 313.15) K using an isothermal flow calorimeter and were correlated by the Redlich–Kister equation. Both binary systems exhibit a positive deviation from the ideality with azeotropes, and an endothermic behaviour has been observed when the 2-pentanol is mixed with these hydrocarbons.