Speakers
Description
Fluorinated diluents have been considered as possible alternative for hydrocarbons. Among their advantages one can list particulary their chemical stability and in many cases high polarity. Unfortunately, the best studied polar fluorinated diluents such as meta- nitrobenzotrifluoride (F-3, MNBTF) or phenyl trifluoromethyl sulfone ( FS-13, PMTS) have density about 1.41 g/cm$^{3}$ and higher solubility in acid solutions than the traditional hydrocarbons. Recently, a new class of fluororganic compounds – carbonates of fluorinated alcohols was proposed as potential diluents. Carbonates of 2,2,3,3-tetrafluoropropan-1-ol (BK-1) and 2,2,3,3,4,4,5,5-octafluoropentan-1-ol are available and rather cheap; they have high boiling point, high density (1.578 and 1.722 g/cm$^{3}$, respectively) and low solubility in water.
In the presented work, extraction ability of two perspective extracting compounds, CyMe$_{4}$-BTBP and CyMe$_{4}$-BTPhen, considered for the SANEX process dissolved in the new fluorinated diluent BK-1 was tested to assess the extractability of trivalent lanthanoids and minor actinoids. The dependences of distribution coefficient D$_{Am}$, D$_{Eu}$, and D$_{Cm}$ and separation factor SF$_{Am/Eu}$ and SF$_{Am/Cm}$ on HNO$_{3}$ concentration (0.001 – 4 mol/L) were evaluated. The SF$_{Am/Eu}$ values higher than 300 were achieved in 2 mol/L and 4 mol/L HNO$_{3}$ for CyMe$_{4}$-BTPhen. The highest SF$_{Am/Cm}$ value (about 5.8) was achieved in 4 mol/L HNO$_{3}$ for CyMe$_{4}$-BTPhen as well. The extraction of studied Ln(III) and An(III) by the neat diluent (without extraction compound) showed that there is no extraction by diluent itself. Moreover, kinetics of Am(III), Eu(III) and Cm(III) extraction was evaluated and will be presented.
