Extraction kinetics of rare earth metals with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester using a hollow fiber membrane extractor

Journal Article · Wed Mar 01 00:00:00 EST 1995 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496399508013891· OSTI ID:68043

Kubota, Fukiko; Goto, Masahiro; Nakashio, Fumiyuki ^[1]; Hano, Tadashi ^[2]

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1. Kyushu Univ., Fukuoka (Japan)
2. Oita Univ. (Japan)

A kinetic study concerning chemical complexation-based solvent extraction of rare earth metals with 2-ethylhexyl 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.

• Sponsoring Organization: USDOE
• OSTI ID: 68043
• Journal Information: Separation Science and Technology, Vol. 30, Issue 5; Other Information: PBD: Mar 1995
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
RARE EARTH COMPLEXES
SOLVENT EXTRACTION
KINETICS
MEMBRANES
PHOSPHINIC ACID ESTERS
MATHEMATICAL MODELS