Application of the data on dielectric constant and viscosity of binary mixtures to the selection of synergistic solvent extraction-binary mixtures of Cyanex and tertiary amine (TEHA)

Abstract

The binary mixtures of Cyanex compounds and tertiary amine have been employed for the synergistic solvent extraction of metal ions. Viscosities and dielectric constants of the binary mixtures consisting of Cyanex compounds (Cyanex 301, Cyanex 272, Cyanex 921 and Cyanex 923) and tertiary amine (TEHA) were measured at 293 K. The interaction between the constituents in the binary mixture was interpreted by analyzing the deviation values and Grunberg-Nissan interaction parameters (d) of viscosity and dielectric constant. Among the binary mixtures employed in this work, the mixture of Cyanex 301 and TEHA showed the strongest interaction (the maximum magnitude of deviations of viscosity and dielectric constant for this mixture was 3.30 mPa·s and 157.55), which was in good agreement with the FT-IR data. The necessary parameters for Redlich-Kister equation were successfully estimated from measured values of the deviation of the viscosity and dielectric constant of the mixture of Cyanex 301 and TEHA. Our results indicated that excess properties and Grunberg-Nissan interaction constant of a binary mixture might provide some information on the nature of the intermolecular interactions in the binary mixture and on the selection of an appropriate mixture for the solvent extraction of metal ions.