Volumetric, enthalpic and VLE studies of binary mixtures of isomers of butyl chloride with cyclohexane at 298.15 K

Abstract

Excess molar volumes (VmE), excess molar enthalpy (HmE) and isothermal vapor-liquid equilibrium data for n-, sec- and tert-butyl chloride (A) + cyclohexane (B) systems were measured at 298.15 K. Excess molar Gibbs free energy (GmE) for these systems were calculated by Barker's method. The VmE and HmE for these mixtures follow the sequence: n- > sec- > tert-butyl chloride while it is reverse for GmE. Prigogine-Flory-Patterson theory (PFP) predicts the experimental VmE and HmE data for these systems quite well except for HmE of n-butyl chloride (xA>0.5) mixtures and tert-butyl chloride mixtures for xA<0.5. The activity coefficients γA and γB of the components in binary (A+B) mixtures were also predicted by Singh and Maken activity coefficient model employing limited experimental activity coefficient data.