Calorimetric study of the selected nitroalkane plus chloroalkane binary systems. Comparison with DISQUAC predictions

Excess enthalpies, H (E), at 298.15 K and atmospheric pressure determined for 12 binary liquid mixtures containing nitromethane or nitroethane+1-chlorobutane, +1-chloropentane, +1-chlorohexane, +1,2-dichloroethane, +1,3-dichloropropane, and +1,4-dichlorobutane by means of a flow 2277-LKB microcalorimeter, are reported on over composition range. The experimental results, along with the literature data on vapor-liquid equilibrium (VLE), excess Gibbs energies, G (E), and activity coefficients at infinite dilution, , are interpreted in terms of DISQUAC group contribution model. The systems are characterized by three types of contact surface: nitro (NO2), chlorine (Cl), and alkyl (CH3, CH2). The interchange energy parameters of the alkyl/NO2 and alkyl/Cl contacts were determined independently from the study of alkane+nitroalkane and alkane+chloroalkane systems. The structure-dependent interchange parameters of the NO2/Cl contact are reported in this work. The model provides a fairly consistent description of the VLE and of thermodynamic functions G (E), H (E), , for all investigated