Densities and Viscosities of Binary Liquid Mixtures of 1,6-Dichlorohexane with Different Hydrocarbons at 308.15, 313.15 and 318.15 K

Abstract

The densities (ρ) and viscosities (η) for the six binary mixtures of 1,6-dichlorohexane with cyclohexane, benzene, methylbenzene, 1,2-dimethylbenzene, 1,4-dimethylbenzene and 1,3,5-trimethylbenzene have been measured over the whole composition range and at 308.15, 313.15 and 318.15 K. The densities have been used to estimate the excess molar volumes (VE) of the binary mixtures at the three experimental temperatures. The experimental viscosities have been used to evaluate the deviations in viscosities (∆η) for the binary mixtures. The densities and viscosities increase as the mole fraction of 1,6-dichlorohexane increases in the binary mixtures. The excess molar volumes for the binary mixtures of 1,6-dichlorohexane with cyclohexane and with benzene are positive over the whole concentration range, at all the three experimental temperatures, while values for the binary mixtures of 1,6-dichlorohexane with methylbenzene, 1,2-dimethylbenzene, 1,4-dimethylbenzene, and 1,3,5-trimethylbenzene are negative for the entire composition range at the three experimental temperatures except for a positive value of VE at lower mole fractions of 1,6-dichlorohexane for the binary mixtures of 1,6-dichlorohexanes with 1,2-dimethylbenzene at 313.15 K. The ∆η values are negative for all the six binary mixtures at the three experimental temperatures. The experimental data of excess molar volumes VE and deviations in viscosities ∆η have been fitted using the Redlich–Kister polynomial equation. However, VE values for binary mixtures of 1,6-dichlorohexane with 1,2-dimethylbenzene at 313.15 K have been fitted using the Myers and Scott equation. The standard deviations in excess molar volumes [σ (VE)] and in deviations in viscosities [σ (∆η)] have also been evaluated. The experimental values of viscosities have been correlated with several equations suggested by Grunberg and Nissan, Katti and Chaudhri, and Hind, Mclaughlin and Ubbelohde. The Hind–Mclaughlin–Ubbelohde equation was found to be most suitable for the viscosities for all the binary mixtures studied at the three experimental temperatures. The results are discussed in terms of molecular interactions between the components of binary mixtures.