S. Delcros et al., LINEAR ALKANOATES PLUS AROMATIC HYDROCARBON BINARY-MIXTURES - NEW EXCESS ENTHALPY MEASUREMENTS AND DISQUAC ANALYSIS OF THERMODYNAMIC PROPERTIES, Fluid phase equilibria, 111(1), 1995, pp. 71-88
Excess enthalpies at 298.15 K and atmospheric pressure are reported fo
r 8 binary liquid mixtures of n-alkanoates (propyl methanoate, butyl m
ethanoate, ethyl ethanoate, propyl ethanoate, butyl ethanoate, methyl
propanoate, ethyl propanoate, propyl propanoate) + toluene. These expe
rimental results along with literature data on vapour-liquid equilibri
um (VLE), excess molar Gibbs energies (G(E)), excess molar enthalpies
(H-E), activity coefficients at infinite dilution (gamma(i)(infinity))
and excess molar heat capacities (Cp(E)) of n-alkanoates + benzene, o
r + toluene are examined on the basis of the DISQUAC group contributio
n model. The components in the mixtures are characterized by three typ
es of contact surfaces: carboxylate (COO group), aliphatic (CH3 or CH2
groups) and aromatic (C6H6 or C6H6 groups, in benzene or in toluene,
respectively). Interaction parameters for aliphatic/aromatic and aliph
atic/COO contacts have been estimated previously. In this work, we hav
e determined the missing heat capacity interaction parameters of the a
liphatic/COO contact and all the interaction parameters of the aromati
c/COO contact. The aromatic/COO contact is best described by entirely
dispersive parameters. The Gibbs energy and enthalpy parameters decrea
se, whereas the heat capacity parameters increase, with the n-alkyl ch
ain of the n-alkanoate.