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

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299308918165· OSTI ID:171437

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

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1. Kyushu Univ., Fukuoka (Japan)

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){sub 2}, as follows. M{sub aq}{sup 3+} + 3(HR){sub 2 org} MR{sub 3} {center_dot} 3HR{sub org} + 3H{sub aq}{sup +} The extraction equilibrium constants of metals were obtained and compared with the extraction equilibrium constants obtained by di(2-ethylhexyl)phosphoric acid (henceforth DZEHPA). 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. 13 refs., 8 figs., 2 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171437
• Journal Information: Solvent Extraction and Ion Exchange, Vol. 11, Issue 3; Other Information: PBD: Jul 1993
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
RARE EARTH COMPOUNDS
EXTRACTION
ESTERS
HEPTANE
MATHEMATICAL MODELS
ORGANIC ACIDS