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The paraffin wax was used as a diluent for 1-nitroso-2-naphthol(HA) and trioctylphosphine oxide(TOPO) in the extraction of lanthanides at 70℃. The composition of the extracted species was given as LnA_3(TOPO)_2 by means of the slope analysis. The variation of the synergistic extraction equilibrium constant(K_ sex) was investigated at 60～80℃, and the thermodynamic data were calculated. The dependence of separation factors on temperature was also studied.
The paraffin wax was used as a diluent for 1-nitroso-2-naphthol (HA) and trioctylphosphine oxide (TOPO) in the extraction of lanthanides at 70 ° C. The composition of the extracted species was given as LnA_3 (TOPO) _2 by means of the slope analysis. The variation of the synergistic extraction equilibrium constant (K_ sex) was investigated at 60-80 ° C, and the thermodynamic data were calculated. The dependence of separation factors on temperature was also studied.