The excess molar volumes and enthalpies of (N-methyl-2-pyrrolidinone plus an alcohol) at T=298.15 K and the application of the ERAS theory

Excess molar volumes V-m(E) at T = 298.15 K and atmospheric pressure are reported for (N-methyl-2-pyrrolidinone + propan-2-ol, or butan-1-ol, or butan-2-ol, or 2-methylpropan-1-ol). The V-m(E) have been calculated from measured values of density using the vibrating tube technique. The results are discussed in terms of the hydrogen bonding and other intermolecular association. Excess molar enthalpies H-m(E) at T = 298.15 K and atmospheric pressure are reported for (N-methyl-2-pyrrolidinone + propan-1-ol, or propan-2-ol, or butan-1-ol, or butan-2-ol, or 2-methylpropan-1-ol). The H-m(E) have been obtained using flow calorimetry. The experimental results have been correlated and compared with the results from the Extended Real Associated Solution (ERAS) theory. The parameters adjusted to the mixtures properties are two cross association parameters and the interaction parameter responsible for the exchange energy of the van der Waals interactions. Self-association parameters of the alcohols and NMP are taken from the literature. (C) 2001 Academic Press.