Correlation of calorimetric data of isoamyl acetate plus primary and secondary alcohols (C1–C4) by Redlich–Kister, NRTL and UNIQUAC models at 298.15 K

Calorimetric measurements were performed for six binary mixtures of isoamyl acetate + alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol) by a Parr 1455 solution calorimeter over the entire composition range at T = 298.15 K and atmospheric pressure. The results were applied to calculate excess molar enthalpies HmE and excess partial molar enthalpies HiE. The HmE values were positive over the whole of composition range and become more positive with increasing the chain length and steric hindrance of the alkanols. The trend of the HmE data was interpreted in terms of the self-association of pure alkanols, dipole–dipole interactions between ester molecules and cross-association between unlike molecules (ester–alkanol). The correlations of experimental data were performed by Redlich–Kister equation and NRTL and UNIQUAC models.

► Excess molar enthalpies of isoamyl acetate + alcohols were calculated at 298.15 K. ► The HmE values are positive and become more positive with increasing chain length and steric hindrance of alkanols. ► The results were correlated with Redlich–Kister equation and NRTL and UNIQUAC models.