Extraction Kinetics of Rare Earth Metals with 2-Ethylhexyl Phosphonic Acid Mono-2-ethylhexyl Ester Using a Hollow Fiber Membrane Extractor

Fukiko Kubota, Masahiro Goto, Fumiyuki Nakashio

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)

    Abstract

    A kinetic study concerning chemical complexation-based solvent extraction of rare earth metals with 2-ethylhexyI phosphonic acid mono-2-ethylhexyl ester dissolved as an extractant in n-heptane was carried out using a microporous hydrophobic hollow fiber membrane extractor. The effects of concentration of chemical species in aqueous and organic feed solutions on the apparent permeabilities of metal species for extraction and stripping, respectively, were investigated to clarify the permeation mechanism. From the experimental results it was predicted that the permeation rate is controlled by diffusion of the chemical species in aqueous and organic phases and by interfacial chemical reaction. The experimental data were analyzed by the diffusion model accompanied with an interfacial reaction, taking into account the velocity distributions of the aqueous and organic phases through the inner and outer sides of the hollow fiber.

    Original languageEnglish
    Pages (from-to)777-792
    Number of pages16
    JournalSeparation Science and Technology
    Volume30
    Issue number5
    DOIs
    Publication statusPublished - 1995

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)
    • Process Chemistry and Technology
    • Filtration and Separation

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