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

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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 - Jan 1 1995

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Rare Earth Metals
Permeation
Rare earths
Esters
Membranes
Kinetics
Acids
Fibers
Heptane
Solvent extraction
Surface chemistry
Velocity distribution
Metals
Complexation
Chemical reactions
2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

All Science Journal Classification (ASJC) codes

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

Cite this

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