The extraction properties of various ligands namely tributyl phosphate, trialkylphosphine oxide, carbamoylmethylphosphine oxide, diglycolamides, pyridine-2,6-dicarboxamide, crown ether, and calix crown ether by using 2-undecanone (U-2) as a diluent were studied. It was shown that the solvents on the basis of the listed ligands in U-2 have fairly high extraction ability towards the extracted metals. The use of U-2 as a diluent prevents the third-phase formation or precipitation, which are common for non-polar diluents. The combined solvent composed of 1,3-dioctyloxycalix4arenecrown-6 (Oct-C4C-6) and N,N,N',N'-tetraoctyldiglycolamide (TODGA) in U-2, which is an analogue of previously proposed СНОN-UNEX-solvent, provides the simultaneous extraction of cesium, strontium, and actinides. The fundamental possibility of U-2 use as a diluent for tributyl phosphate (TBP) applied for uranium and plutonium recovery, for ligands selective to minor actinides and rare earth elements, and also for calix crown ethers and crown ethers applied for Cs and Sr recovery has been established. This gives every reason to consider U-2 as a promising option for the implementation of the concept of a single diluent for all stages of spent nuclear fuel (SNF) solution reprocessing.
Бабаин et al. (Tue,) studied this question.
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