Excess enthalpies of 12 binary liquid mixtures of trichloromethane or 1,1,2,2-tetrachloroethane + 1-chloroalkanes (C4 - C9) at 298.15 K

Abstract

Enthalpy-of-mixing, HE, measurements are reported at 298.15 Kfor 1-ch/oroalkanes (1-chlorobutane through 1- chlorononane) + trichloromethane or + 1,1,2,2- tetrachloroethane The mixtures containing 1-chlorobutane are exothermic. HE increases with the chain length of the J-chloroalkane becoming negative/positive or positive for J,1,2,2-tetrachloroethane + 1-chlorooctane or + 1- chlorononane. The experimental HE data are not reproduced by the Modified UNIFAC group contribution method (Dortmund version), using the parameters published in 1993, mainly because of having neglected the group proximity effect. The DISQUAC mode� with dispersive parameters changing regularly with the structure of the molecules, describes fairly well both the magnitude and the shape of the experimental HE curves.