Excess parameters for the binary mixtures of sulfolane with chloroethanes at different temperatures

Densities (ρ), viscosities (η) and ultrasonic velocities (u) have been measured for the binary mixtures of sulfolane with 1,2-dichloroethane, 1,1,2-trichloroethane and 1,1,2,2-tetrachloroethane over the entire range of mole fraction at T = (303.15, 308.15 and 313.15) K. These data have been used to compute the excess molar volume (VE), deviation in viscosity (Δη), deviation in isentropic compressibility (Δκs), excess Gibbs free energy of activation of viscous flow (G*E) and Grunberg–Nissan interaction parameter (\( d^{\prime } \)). The excess parameters have been fitted to Redlich–Kister-type polynomial equation using multiparametric nonlinear regression analysis to estimate the binary coefficients and standard deviation. The experimental results have been discussed in terms of dipole–dipole interactions and formation of molecular complexes between unlike molecules of the investigated mixtures. Furthermore, the effect of temperature and chlorine atoms of chloroethane is also studied for the present binary mixtures.