Excess molar enthalpies of methyl isobutyl ketone (MIBK) with alkan-1-ols (C1-C6) and their correlations at 298.15Â K

Excess molar enthalpies, HmE of methyl isobutyl ketone + methanol, +ethanol, +propan-1-ol, +butan-1-ol, +pentan-1-ol, and +hexan-1-ol have been measured at 298.15 K and atmospheric pressure with a Parr 1455 solution calorimeter. Excess molar enthalpies, HmE values are always positive and increase as the chain length of the alkan-1-ol is increased, showing maximum values varying from 882 (methanol) to 1510 J mol−1 (hexan-1-ol). The maximum values were observed about 0.5-0.6 mole fraction of methyl isobutyl ketone (MIBK). The experimental results are discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules. The experimental data were correlated by the Redlich-Kister equation and the two local-composition models (Wilson and NRTL). The correlation of excess enthalpy data in the systems using NRTL model provides good results.