Solvent extraction of An(III) and Ln(III) using TODGA in aromatic diluents to suppress third phase formation
The extraction of nitric acid, trivalent actinides and lanthanides with N,N,N′,N′-tetra-n-octyl-3-oxapentanediamide (TODGA) dissolved in the aromatic diluents 1,4-diisopropylbenezene and tert-butylbenzene was studied. Nitric acid extraction proceeds along the formation of 1:1 and 2:1 HNO3-TODGA addu...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
8 January 2020
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| In: |
Hydrometallurgy
Year: 2020, Volume: 192 |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2020.105248 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.hydromet.2020.105248 Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0304386X19308941 
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| Author Notes: | Patrik Weßling, Udo Müllich, Elise Guerinoni, Andreas Geist, Petra J. Panak |
| Summary: | The extraction of nitric acid, trivalent actinides and lanthanides with N,N,N′,N′-tetra-n-octyl-3-oxapentanediamide (TODGA) dissolved in the aromatic diluents 1,4-diisopropylbenezene and tert-butylbenzene was studied. Nitric acid extraction proceeds along the formation of 1:1 and 2:1 HNO3-TODGA adducts. An(III) and Ln(III) distribution ratios were determined as a function of nitric acid, TODGA and Ln(III) concentrations. Distribution ratios are approximately an order of magnitude lower in aromatic diluents compared to aliphatic diluents. No third phase formation was observed when contacting the solvent with an aqueous phase containing 1.5mol/L Er(NO3)3 in 2-4.3mol/L HNO3. Slope analysis indicates the formation of 1:3 and 1:4M(III):TODGA complexes. Using TRLFS, the formation of a previously unknown 1:2 complex in organic phases loaded with Ln(III) was observed for the first time. |
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| Item Description: | Gesehen am 13.05.2020 |
| Physical Description: | Online Resource |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2020.105248 |