Excess enthalpy of ethanol plus n-alkane (C6-C9) or cyclohexane or diisopropyl ether mixtures at 298.15 K: Measurement and modeling

Flow microcalorimeter was used to measure the excess molar enthalpy (H-m(E)) for ethanol (1) + n-alkanes or cydohexane or diisopropyl ether (2) systems at 298.15 K The plot for H-m(E) versus x(1) are tilted toward y-axis with a maxima at x(1)similar to 0.4 and for equimolar mixture the H-m(E) vary as: n-nonane > n-octane > cyclohexane > n-heptane > n-hexane > DIPE. The results were qualitatively discussed in terms of intermolecular interactions. For the theoretical interpretation of the experimental fa values, Flory-Treszczanowicz-Benson association model (FTB) based on Mecke-Kempter association in alcohol and Graph theoretical approach were applied. Graph theoretical approach and FTB model describe well the experimental H-m(E) data for present system except for ethanol + DIPE in case of FTB model. FTB model also predicted the excess molar volume (V-m(E)) for the present systems and compared well with their reported excess volume data. (C) 2019 Elsevier B.V. All rights reserved.