Calorimetric study of the selected nitroalkane+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, γ i ∞ , are interpreted in terms of DISQUAC group contribution model. The systems are characterized by three types of contact surface: nitro (NO 2 ), chlorine (Cl), and alkyl (CH 3 , CH 2 ). The interchange energy parameters of the alkyl/NO 2 and alkyl/Cl contacts were determined independently from the study of alkane+nitroalkane and alkane+chloroalkane systems. The structure-dependent interchange parameters of the NO 2 /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 , γ i ∞ , for all investigated mixtures.