Extraction by N,N-dialkylamides. II. Extraction of actinide cations

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299208918093· OSTI ID:171542

Condamines, N; Musikas, C ^[1]

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1. CEA-DCC-DPR-SEMP-SECP, Fontenay-aux-Roses (France)

N,N-dialkylamides are potential alternative extractants to tributyl-phosphate for the actinide separation in nuclear fuel reprocessing. Extraction mechanisms of U(VI), Th(IV) and Pu(IV) from nitric acid media are investigated for the amide DOBA(((C{sub 4}H{sub 9})(C{sub 2}H{sub 5})CHCH{sub 2}){sub 2}NC(O)C{sub 3}H{sub 7}) and DO{sub i}BA(((C{sub 4}H{sub 9})(C{sub 2}H{sub 5})CHCH{sub 2}){sub 2} NC(O)CH(CH{sub 3}){sub 2}). For low aqueous acidities, amides are neutral extractants. Extraction stoichiometries of U{bar O}{sub 2}(NO{sub 3}){sub 2}(Amide){sub 2}{bar O} (Amide = DOBA or DO{sub i}BA), P{bar O}u(NO{sub 3}){sub 4}(DOBA){sub 2}{bar O} have been established. Th(IV) is supposed to form a di- and a trisolvate in the inner-coordination sphere. For concentrated solvents, bilogarithmic dependences of distribution coefficients with ligand concentration point out non-integer slopes higher than those expected from stoichiometry. Such features, very often noted for amides, do not seem to be due to new chemical second-sphere species, which has never observed experimentally, but to polyoriented interactions between free ligands and complexes and may be considered as part of non-ideality. 21 refs., 15 figs., 6 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171542
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 1 Vol. 10; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
AMIDES
CATIONS
EXPERIMENTAL DATA
NITRIC ACID
PLUTONIUM
SOLVENT EXTRACTION
SPECTROPHOTOMETRY
STOICHIOMETRY
THORIUM
URANIUM