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

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*15K 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 1510Jmol(--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.