Abstract
Binary mixtures of tertiary amine and acidic extractant showed synergism on the extraction of metals from a weak acid solution but there is uncertainty in identifying the solvent extraction reaction. The nature of interaction between the extractants in the binary mixture affects synergism in extraction reaction. In order to correlate the interaction with the physical properties of each extractant in the binary mixture, extraction of HCl from dilute solution in the absence/presence of rare earth elements (REEs) has been investigated. The extraction order of HCl and REEs was: Cyanex 272+Alamine 336>PC88A+Alamine 336>D2EHPA>Alamine 336. The interaction between strong acidic extractant (D2EHPA) and Alamine 336 was strong enough to form an amine salt which took part in the reaction. In the binary mixture of weak acidic extractant (Cyanex 272 and PC88A) and Alamine 336, each extractant took part in the reaction independently.
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