A highly efficient solvent system containing TODGA in room temperature ionic liquids for actinide extraction

Panja, S.; Mohapatra, Prasanta K.; Tripathi, S. C.; Gandhi, P.M.; Janardan, P.

doi:10.1016/j.seppur.2012.06.015

Cited by 134 publications

(39 citation statements)

References 38 publications

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“…This method is also widely used in ionic liquids, although the slope is often significantly far from an integerv alue. [50] On the basis of our model, we can calculate the expectedv ariation of logD U versus log[TBP]i n aw ay similar to the traditional slope analysism ethod. To this end we can safely consider only Equation (6) to be applicable, owing to the high acidity at which these experiments have been performed.…”

Section: Extraction Data Modelling and Discussionmentioning

confidence: 99%

Insights into the Mechanism of Extraction of Uranium (VI) from Nitric Acid Solution into an Ionic Liquid by using Tri‐n‐butyl phosphate

et al. 2015

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We present new results on the liquid-liquid extraction of uranium (VI) from a nitric acid aqueous phase into a tri-n-butyl phosphate/1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (TBP/[C4 mim][Tf2 N]) phase. The individual solubilities of the ionic-liquid ions in the upper part of the biphasic system are measured over the whole acidic range and as a function of the TBP concentration. New insights into the extraction mechanism are obtained through the in situ characterization of the extracted uranyl complexes by coupling UV/Vis and extended X-ray absorption fine structure (EXAFS) spectroscopy. We propose a chemical model to explain uranium (VI) extraction that describes the data through a fit of the uranyl distribution ratio DU . In this model, at low acid concentrations uranium (VI) is extracted as the cationic complex [UO2 (TBP)2 ](2+) , by an exchange with one proton and one C4 mim(+) . At high acid concentrations, the extraction proceeds through a cationic exchange between [UO2 (NO3 )(HNO3 )(TBP)2 ](+) and one C4 mim(+) . As a consequence of this mechanism, the variation of DU as a function of TBP concentration depends on the C4 mim(+) concentration in the aqueous phase. This explains why noninteger values are often derived by analysis of DU versus [TBP] plots to determine the number of TBP molecules involved in the extraction of uranyl in an ionic-liquid phase.

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Section: Extraction Data Modelling and Discussionmentioning

confidence: 99%

Insights into the Mechanism of Extraction of Uranium (VI) from Nitric Acid Solution into an Ionic Liquid by using Tri‐n‐butyl phosphate

et al. 2015

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“…Extraction of Am 3+ has been reported by Sengupta et al [32] using TODGA and a diglycolamide functionalized calixarene in C n mimPF 6 ionic liquids. Solvent extraction behavior of An n+ ions using TODGA in C n mimTf 2 N as diluent have been reported by Panja et al [33] and favored extraction of the actinides in RTIL compared to n-dodecane as diluent was observed.…”

Section: Introductionmentioning

confidence: 64%

Effect of room temperature ionic liquid on the extraction behavior of Plutonium (IV) using a novel reagent, bis-(2-ethylhexyl) carbamoyl methoxy phenoxy-bis-(2-ethylhexyl) acetamide [Benzodioxodiamide, BenzoDODA]

Panja

Ruhela

Tripathi

et al. 2015

Separation and Purification Technology

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“…The extractants such as N,N,N',N'-tetrabutyl-3-oxapentanediamide (TBDA) and N,N'-dimethyl-N, N'-dibutyl-3-oxapentanediamide (MBDA) or N,N,N´,N´-tetra-n-octyl diglycolamide (TODGA) used to extract Th(IV) [86] or Am(III), Pu(IV) and UO 2 2 + [87] have been dissolved in various imidazolium derivatives. As one can expect, the extraction systems using the ILs are more efficient for all the above actinides if compared with traditional diluents in the extraction system (e.g.…”

Section: Ionic Liquids In Extractionmentioning

confidence: 99%

Recent trends in metals extraction

Regel‐Rosocka¹

2013

REVMETAL

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After near 70 years of practical usage, solvent extraction is a perfectly mastered technique of separation, widely used on an industrial scale for the separation of metals mainly from raw materials. However, currently, in the era of depleting natural resources and increasingly less accessible deposits, environmental restrictions, etc., an increasing interest, both from social and economical constrains, is being directed at the extraction of metals from the secondary sources (such as batteries, electronic scrap). In many cases, solvent extraction, due to its operational characteristics, can be considered as the Best Available Technology for the purpose of separating multielemental metal solutions. This paper provides a brief overview of past achievements and present scenario of solvent extraction investigations and developments, describing some recently commissioned solvent extraction plants, whereas the Skorpion Zinc plant (Namibia) for zinc extraction from raw materials and caesium removal from radioactive High Level Wastes (HLWs) are told over in detail as case studies. The paper also presents some proposals for the use of liquid-liquid extraction to separate metal ions from secondary sources (e.g. cobalt from industrial waste streams). The review highlights the emerging use of ionic liquids as new extractants for metals, providing an insight into this exciting research field. Despite its detractors, solvent extraction has entered in force into XXI century as a leading separation technology for metals. KeywordsLiquid-liquid extraction; Metals; Extractants; Ionic liquids; Caesium. Tendencias recientes en la extracción de metales ResumenDespués de casi 70 años de uso práctico, la extracción líquido-líquido o extracción con disolventes es una técnica de separación muy evolucionada, utilizándose a escala industrial en el beneficio de metales obtenidos de diversas materias primas. Sin embargo, con el agotamiento de los recursos naturales y el aumento de depósitos minerales de más difícil acceso, restricciones medio ambientales, etc., ha aumentado el interés, tanto desde el punto de vista económico como social, en la recuperación de los metales contenidos en materiales secundarios (baterías, chatarras electrónicas). En muchos casos, la extracción líquido-líquido y debido a sus características operacionales, se considera como la mejor tecnología disponible respecto a la separación de disoluciones metálicas multielementales. Este trabajo considera algunos de estos anteriores estudios y presenta la situación actual de la tecnología en cuanto a investigaciones y desarrollos, describiendo algunas de las más recientes plantas industriales en funcionamiento, detallando la planta Skorpion (Namibia) para la obtención de zinc, así como investigaciones encaminadas a la eliminación de cesio de efluentes radioactivos. También se presentan algunas de las propuestas encaminadas a la separación-recuperación de metales de materiales secundarios (por ejemplo, cobalto). Por último, se describe el uso emergente de los iones líq...

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A highly efficient solvent system containing TODGA in room temperature ionic liquids for actinide extraction

Cited by 134 publications

References 38 publications

Insights into the Mechanism of Extraction of Uranium (VI) from Nitric Acid Solution into an Ionic Liquid by using Tri‐n‐butyl phosphate

Insights into the Mechanism of Extraction of Uranium (VI) from Nitric Acid Solution into an Ionic Liquid by using Tri‐n‐butyl phosphate

Effect of room temperature ionic liquid on the extraction behavior of Plutonium (IV) using a novel reagent, bis-(2-ethylhexyl) carbamoyl methoxy phenoxy-bis-(2-ethylhexyl) acetamide [Benzodioxodiamide, BenzoDODA]

Recent trends in metals extraction

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