Studies Of Thermodynamic Properties Of Binary Mixtures Of Chloralkane And Aromatic Compounds

The values of the density have been determined for(dichloromethane + benzene,toluene,aniline,nitrobenzen),(1,2-dichloroethane + chlorobenzene,bromobenzene) and (1,1,2-trichlorotrifluoroethane+xylene) mixtures over entire range of concentration using a vibrating-tube densimeter at different temperature and atmospheric pressure.The excess molar volumes V_m~E,calculated from the data of density,were fitted to Redlich-Kister polynomial equation.The values of excess molar volumes are positive for binary mitures of dichloromethane with benzene,1,2-dichloroethane with chlorobenzene,bromobenzene.The V_m~E values of aniline,nitrobenzen with dichloromethane are negative.The(V_m~E-x) curves of (dichloromethane + toluene) are S-shaped.The Prigogine-Flory-Patterson(PFP) theory and its applicability in predicting V_m~E for (dichloromethane + benzene,toluene,aniline,nitrobenzen,1,2-dichloroethane + chlorobenzene,bromobenzene) are tested.Good agreement is for the mixtures dichloromethane + benzene,aniline,nitrobenzen and 1,2-dichloroethane + chlorobenzene, bromobenzene.For the mixtures dichloromethane with toluene,which shows an approximate S-shaped V_m~E behavior,the correlation fails.Furthermore,viscosities and refractive indices were measured for binary liquid mixtures of chlorobenzene and bromobenzene with 1,2-dichloroethane at T=(298.15,303.15,308.15, and 313.15) K over the whole composition range by a Ubbelohde suspended-level viscometer and Abbe refractometer at atmospheric pressure.Viscosity deviations(Δη) and refractive index deviations(Δn_D) have been calculated and fitted to the Redlich-Kister polynomial equations.Δn_D are positive whereasΔηare negative over the entire mixture composition for the two binary mixtures.The refractive indices were compared with the predictions of the Lorentz-Lorenz,Wiener,and Gladstone-Dale equations at 298.15 K.