SYNERGISTIC EXTRACTION OF SOME RARE EARTH IONS BY 1-PHENYL-3-METHYL-4-BENZOYL-5-PYRAZOLONE AND TRIOCTYLPHOSPHINE OXIDE IN PARAFFIN WAX

摘要

The paraffin wax was used as an organic solvent for l-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) and trioctylphousphine oxide (TOPO) in the extraction of rare earth ions(La~(3+), Pr~(3+), Eu~(3+), Yb~(3+) and Ho~(3+)) at the temperature of 70°C. The composition of the extracted species were given as RE(PMBP)_3(TOPO)_2 by means of slope analysis. The variation of the synergistic extraction equilibrium constant(Ksex) was studied at the temperature from 55°C to 75°C. The thermodynamic data obtained showed that me synergistic extraction of rare earth ions by PMBP and TOPO in melton paraffin wax is exothermic and the extracted complexes were formed by TOPO bonding to the outer sphere hydration.