Extraction Of Actinides And Lanthanides From Nitric Acid Solutions With Mixtures of 1,5-N,N′- Bis[(Diphenylphosphoryl)Acetyl(Hexyl)Amino]Pentane And New Asymmetrical Phosphonium- And Imidazolium Based Ionic Liquid

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Abstract

A new dicationic ionic liquid 1-methyl-3-(4-(tributylphosphonio)butyl)-1H-imidazol-3-ium di[bis(trifluoromethanesulfonul)imide] [ImP][Tf2N]2, characterized by high hydrophobicity (solubility in water 9.2 × 10-4 mol/l) was synthesized. The extraction of U(VI), Th(IV), and lanthanides(III) from nitric acid solutions with mixtures of 1,5-N,N’-bis[(diphenylphosphoryl)acety(hexyl)amino]pentane (L), containing two bidentate fragments Ph2P(O)CH2C(O)N(Hex)- interconnected by pentamethylene spacer through amide nitrogen atoms, and [ImP][Tf2N]2 in 1,2-dichloroethane (DCE) was studied. During the extraction of metal ions in this system, a significant synergistic effect is observed. The influence of the composition of the aqueous and organic phases on the efficiency of the extraction of metal ions into the organic phase is considered, and the stoichiometry of the extracted complexes is determined. The synergistic effect at the extraction of Ln(III) from 3 M HNO3 solutions with a mixture of L and [ImP][Tf2N]2 in DCE is an order of magnitude higher than in the L–[C8mim][Tf2N]–DCE system.

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About the authors

A. N. Turanov

Yu.A. Ossipyan Institute of Solid State Physics of the Russian Academy of Sciences

Email: sharovaev@mail.ru
Russian Federation, Chernogolovka, 142432

V. K. Karandashev

Institute of Microelectronics Technology and High-Purity Materials of the Russian Academy of Sciences

Email: sharovaev@mail.ru
Russian Federation, Chernogolovka, 142432

E. V. Sharova

A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences

Author for correspondence.
Email: sharovaev@mail.ru
Russian Federation, Moscow, 119334

O. I. Artyushin

A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences

Email: sharovaev@mail.ru
Russian Federation, Moscow, 119334

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Supplementary files

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2. Fig. 1. Effect of HNO3 concentration in the aqueous phase on the extraction of Th(IV) (1, 4), U(VI) (2, 5) and Eu(III) (3, 6) with solutions of compound L in dichloroethane (4-6) and in dichloroethane containing 0.003 M IL [ImP][Tf2N]2 (1-3). Concentration L, mol/l: 0.0001 (1, 4), 0.0005 (2, 5), 0.002 (3, 6).

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3. Fig. 2. Distribution coefficients of lanthanides(III) during extraction from solutions of 3 M HNO3 with solutions of compounds L (1, 2, 5) and CMFO Ph2Bu2 (3, 4, 6) in dichloroethane (5, 6) and dichloroethane containing 0.025 M [ImP][Tf2N]2 (1, 3) and [C8mim][Tf2N] (2, 4). The concentration of the compound is L 0.01 mol/l, CMFO Ph2Bu2 0.02 mol/L.

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4. 3. Effect of the concentration of compound L in dichloroethane containing 0.002 M [ImP][Tf2N]2 on the extraction of Th(IV), U(VI) and Ln(III) from solutions of 1 M HNO3.

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5. Fig. 4. Effect of the concentration of [ImP][Tf2N]2 in dichloroethane containing 0.002 M of compound L on the extraction of Ln(III) from a solution of 1 M HNO3.

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6. Fig. 5. Effect of [ImP]Br2 concentration in the aqueous phase on the extraction of Ln(III) from 0.01 M HNO3 solutions with 0.002 M solutions of the L compound in dichloroethane containing 0.002 M [ImP][Tf2N]2.

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7. Scheme

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