Thermophysics of multicomponent nonelectrolytic solutions

Thermophysical properties of nonelectrolytic solutions have proven to be a very useful tool in elucidating the structural interactions among components. For example, density, viscosity, dielectric constant and refractive index can be used to study solvent - solvent specific interactions as afunction of temperature, while the composition dependence provides valuable and unsubstituible information about the presence and teh stoichiometry of complex adducts. In many cases, all of this information can be employed in a complementary fashion to clarify the macro- and microscopic behaviour of electrolytic solutions too. In this paper we will deal deal first of all with the above mentioned properties in aqueous and nonaqueous solutions, both binary and ternary mixtures , containing 1,2-ethanedyil derivatives such as 1,2-ethanediol (ED); 2-methoxyethanol (ME); 1,2-dimethoxyethane (DME); 2-chloroethanol (CE); 1,2dichloroethane (DCE); in addition to water (W) and DMF among other species. It is well recognized that correlation procedures of physical properties are and will always be valuable aids to practicing engineers and chemists, because of their extensive employment for predictive calculations in research, development, process design and analysis. Therefore, particular emphasiswill be given to these aspects and some standpoints will be discussed. Furthermore, careful attention will be paid about excess mixing properties and the pseudo-ideality condition which is sometimes encountered when working with binary and more complex solvent systems.