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Synergistic solvent extraction of lanthanide ions with mixtures of D2EHPA and MIDPA in phosphonium-based ionic liquids

Matsumiya, Masahiko*; Nomizu, Daiki*; Tsuchida, Yusuke*; Sasaki, Yuji  

The synergistic solvent extraction of lanthanide(III) with mixtures of di-(2-ethylhexyl)phosphoric acid (D2EHPA, A) and monoisodecyl phosphoric acid (MIDPA, B) in phosphonium-based ionic liquid was investigated. In the case of D2EHPA or MIDPA single extractant system, Ln(III) (Ln = Pr and Nd) was extracted as [LnA$$_{3}$$HA] or [LnB$$_{3}$$HB], respectively, the extracted species of Tb(III) or Dy(III) were determined by slope analysis. According to the equilibrium constants ($$K_{rm A}$$, $$K_{rm B}$$ and $$K_{rm AB}$$) and the formation constants ($$beta_{1}$$, $$beta_{1}$$ and $$beta_{3}$$), it was found that the extracted complex [TbHA$$_{2}$$B$$_{2}$$ or [DyHA$$_{2}$$B$$_{2}$$] was more stable than [LnA$$_{3}$$HA] or [LnB$$_{3}$$HB]. The synergistic extraction effects were investigated to study the possibility of separating Dy(III) from Pr(III) and Nd(III) according to their separation factors.

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Category:Metallurgy & Metallurgical Engineering

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