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Hexanoic acid as an alternative diluent in a GANEX process: feasibility study

Elin Löfström Engdahl (Institutionen för kemi- och bioteknik, Kärnkemi) ; Emma Aneheim (Institutionen för kemi- och bioteknik, Kärnkemi) ; Gunnar Skarnemark (Institutionen för kemi- och bioteknik, Kärnkemi) ; Mark Foreman (Institutionen för kemi- och bioteknik, Kärnkemi) ; Christian Ekberg (Institutionen för kemi- och bioteknik, Kärnkemi)
Journal of Radioanalytical and Nuclear Chemistry (0236-5731). Vol. 290 (2014), 3, p. 1261-1266.
[Artikel, refereegranskad vetenskaplig]

Used nuclear fuel is radiotoxic for mankind and its environment for a long time. However, if it can be transmuted, the radiotoxicity as well as its heat load are reduced. Before a transmutation the actinides within the used fuel need to be separated from the fission, corrosion and activation products. This separation can be achieved by using the liquid–liquid extraction technique. One extraction process that can be used for such a separation is the Group ActiNide EXtraction (GANEX) process. One GANEX process that can successfully accomplish the separation utilizes the diluent cyclohexanone in combination with the extractant tributylphosphate (TBP) (30 % vol) and a second extractant, CyMe4-BTBP (10 mM). However, there are some issues when using cyclohexanone as diluent. In this work an alternative diluent has therefore been tried in order to determine if it can replace cyclohexanone. The diluent used was hexanoic acid. In a system containing 10–12 mM CyMe4-BTBP and 30 % vol TBP in hexanoic acid with the aqueous phase 4 M HNO3, the distribution ratios for americium and curium are unfortunately low (DAm = 1.1 ± 0.27, DCm = 1.6 ± 1.81). The concentration of CyMe4-BTBP ligand, the extractant of curium and americium, could unfortunately not be increased, because of limited solubility in hexanoic acid. The distribution ratios for fission, corrosion and activation products were low for most metals; however, cadmium, palladium and molybdenum all unfortunately have distributions ratios above 1. To conclude, low americium and curium extractions indicate that hexanoic acid is not a suitable diluent which could replace cyclohexanone in a GANEX process

Nyckelord: Solvent extraction, GANEX, diluent



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Denna post skapades 2013-11-27. Senast ändrad 2015-11-05.
CPL Pubid: 187523

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kärnkemi (2005-2014)

Ämnesområden

Energi
Hållbar utveckling
Kemi
Kemiteknik

Chalmers infrastruktur

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