Synergistic solvent extraction and separation of trivalent lanthanide metals with mixtures of 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one and aliquat 336

摘要

The solvent extraction of La,Nd,Eu,Ho and Lu with 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one(HP)and the quaternary ammonium salt aliquat 336 in the chloride(QC1)and perchlorate(QC1O_4)forms in CHC1_3,CC1_4 and C_6H_(12)has been studied.On the basis of the slope analysis,the composition of the extracted species was determined as Q~+[LnP_4]~-(Q~+ is the quaternary ammonium salt cation).The values of the equilibrium constant were obtained.The effect of the diluents and the anions of the salt on the metal extraction and separation was determined.The possible interaction between the extractants and its influence on the synergistic extraction process have been discussed.