Abstract
A new extractant, {[2-(2-diphenylphosphoryl)-4-ethylphenoxy]ethyl}diphenylphosphine oxide, has been synthesized, and its solutions in 1,2-dichloroethane and a ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, have been used to extract HNO3, uranium(VI), thorium(IV), and trivalent rare earths from nitric acid solutions. The stoichiometry of the extracted complexes has been determined, and the effects of the extractant structure and HNO3 concentration in the aqueous phase on the extraction efficiency have been studied. The extraction efficiency has been found to significantly increase when ionic liquid is present in the organic phase.
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