Extraction of rare earth metals with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester in the presence of diethylenetriaminepent aacetic acid in aqueous phase

Fukiko Kubota, Masahiro Goto, Fumiyuki Nakashio

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    62 Citations (Scopus)

    Abstract

    The extraction equilibria of rare earth metals with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (commercial name, PC-88A, henceforth abbreviated as HR) dissolved in n-heptane were measured at 303 K. It was found that rare earth metals are extracted with the dimer of the extractant, (HR)2, as follows. Mni UQ + 3(HR)2, ⇌ MRa • 3HR org + 3H+ uqThe extraction equilibrium constants of metals were obtained and compared with the extraction equilibrium constants obtained by di(2-ethylhexyl)phosphoric acid (henceforth D2EHPA). Furthermore, the extraction equilibria of rare earth metals with PC-88A in the presence of diethylenetriaminepentaacetic acid (henceforth DTPA) in an aqueous phase were also measured to discuss the effect of DTPA on the extraction of rare earth metals.

    Original languageEnglish
    Pages (from-to)437-453
    Number of pages17
    JournalSolvent Extraction and Ion Exchange
    Volume11
    Issue number3
    DOIs
    Publication statusPublished - Jan 1 1993

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)

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