Tetra-butyl-malonamide and tetra-isobutyl-malonamide as extractants for uranium(VI) and plutonium(IV)

Journal Article · Fri Oct 01 04:00:00 UTC 1993 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299308918189· OSTI ID:171534

Nair, G M; Prabhu, D R; Mahajan, G R; Shukla, J P ^[1]

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1. Bhabha Atomic Research Centre, Bombay (India)

Two new symmetrical diamides, namely straight-chain alkyl substituted neutral tetra-butyl-malonamide (TBMA) and sterically hindered branched-chain alkyl substituted tetra-isobutyl malonamide (TIBMA) were synthesised, characterised and used for the extraction of U(VI) and Pu(IV) from nitric acid media into n-dodecane. Both the cations were found to be extracted as their disolvates. Interestingly TBMA extracted more efficiently than TIBMA but afforded poor selectivity for Pu/U separation. The thermodynamic parameters involved in the extraction, determined by the temperature variation method, indicated the reactions in all cases to be enthalpy favoured. Entropy was found to be counteracting the extraction of U(VI) and favouring the extraction of Pu(IV). The recovery of diamides from the loaded actinides could be easily accomplished by using dilute oxalic acid or dilute U(IV) as the strippant for Pu(IV) and using dilute Na{sub 2}CO{sub 3} as that for U(VI). 15 refs., 4 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171534
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 5 Vol. 11; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
AMIDES
DODECANE
ENTROPY
EXPERIMENTAL DATA
EXTRACTION
NITRIC ACID
PLUTONIUM IONS
SODIUM CARBONATES
THERMODYNAMICS
URANIUM IONS