Excess Molar Enthalpies and Excess Molar Volumes for Mixtures of 1,3-Dimethyl-2-imidazolidinone and an Alkanol at T = 298.15 K

Abstract

Excess molar enthalpies, , and excess molar volumes, , of the mixtures {(1,3-dimethyl-2-imidazolidinone (DMI) + methanol, ethanol, 1-propanol, 2-propanol, or 1-butanol} for the whole range of compositions have been measured at T = 298.15 K. The excess molar enthalpy values ranged from a minimum of −410 J mol-1 for the mixture (DMI + methanol) to a maximum of +650 J mol-1 for the mixture (DMI + 2-propanol). The excess molar volumes are negative for all the mixtures studied and ranged from − 0.83 cm3 mol-1 to − 0.20 cm3 mol-1. The Redlich−Kister polynomial was used to correlate both the excess molar enthalpy and excess molar volume data. The NRTL and UNIQUAC models were used to correlate the enthalpy of mixing data. Both the NRTL and UNIQUAC models correlate the data equally well. The results are discussed in terms of the ease of hydrogen bond formation between the proton of the alkanol and the O atom of 1,3-dimethyl-2-imidazolidinone and are compared with related systems found in the literature.