Benzo-15-Crown-5 as Synergistic Agent in the Extraction of Pr(III) from Perchlorate Medium with Thenoyltrifloroacetone in 1,2-Dichloroethane, Carbon Tetrachloride and Chloroform

Valeri Jordanov
Department of General and Inorganic Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Okhridski Blvd., 1756 Sofia, Bulgaria

The synergistic solvent extraction of Praseodymium (Pr) from perchlorate medium by mixtures of thenoyltrifluoroacetone (HTTA) and a crown ether benzo-15-crown-5 (B15C5) is studied. The composition of the extracted species has been determined as Pr(TTA)3.2B15C5. The values of the equilibrium constant KT,S are calculated. Furthermore, the influence of the polarity of organic diluents on the extraction process is investigated.

Keywords: synergistic extraction, lanthanides, thenoyltrifluoroacetone, benzo-15-crown-5.