Abstract
The dielectric constants and viscosities of binary mixtures of organophosphorus acids (D2EHPA, Cyanex 301, PC88A, and Cyanex 272) and quaternary amine (Aliquat 336) were measured by varying their chemical compositions. The strength of the interaction between the components in the binary mixture was analyzed through the deviation of dielectric constant, viscosity, and Grunberg-Nissan interaction parameters. The interaction of binary mixture was also verified through Fourier-transform infrared spectroscopy (FT-IR). The results indicated that the mixtures of D2EHPA/ Cyanex 301 + Aliquat 336 showed the stronger interaction among four acidic extractants in this work. FTIR data and analysis of the interaction on the basis of chemical structure indicate that ionic liquid can form in the mixture of D2EHPA and Aliquat 336 at specific composition. Adduct can be formed between Aliquat 336 and organophosphorus acids through hydrogen bond of methyl group. Our results can give some information on the selection of the composition of binary mixtures between organophosphorus acids and Aliquat 336 for the synergistic extraction of metal ions in hydrometallurgy.
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