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The solvent extraction of trivalent lanthanoids (without Pm) with thenoyltrifluoroacetone (HTTA) and dibenzo-18-crown-6 (DB18C6) or dibenzo-24-crown-8 (DB24C8) has been studied. It was found that in the presence of a crown ether (S) the lanthanoids have been extracted as Ln(TTA) 3 · S. On the basis of the experimental data, the values of the equilibrium constants have been calculated. It was established that the stability of the complexes involving DB24C8 is higher than those involving DB18C6. The influence of the synergistic agent on the extraction process has been discussed. The synergistic and separation factors have been determined too. [ABSTRACT FROM AUTHOR]

The synergistic solvent extraction of lanthanide ions with mixtures of 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one (HP) and the quaternary ammonium salt Aliquat 336 in chloride (QCl) or perchlorate (QClO4) forms in C6H6 was studied. The composition of the extracted species was determined as Q[LnP4] (Q+ is a quaternary ammonium salt cation). The values of the equilibrium constant were calculated. The extraction mechanism as well as the effect of the quaternary ammonium salt anion (Cl− or ClO4−) on the extraction process are discussed. The separation factors of the lanthanide ions were determined on the basis of the experimental data. Some trends in the lanthanide separation were established. [ABSTRACT FROM AUTHOR]

The solvent extraction behavior of 13 lanthanides has been investigated using 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HP) as an extractant in aqueous-benzene medium. The composition of the extracted species has been determined as LnP3·HP. The values of the equilibrium constant as well as the separation factors between the adjacent elements have been evaluated. [ABSTRACT FROM AUTHOR]