Synergistic extraction of uranium(VI) with primary amine N1923 and TOPO

Abstract

The synergistic extraction of uranium(VI) from sulfuric acid solution with primary amine N1923 and tri-octylphosphine oxide (TOPO) inn-heptane was studied. When the mole ratio of primary amine N1923 and TOPO is about 2∶1, the distribution coefficient will be the maximum. This result shows that primary amine N1923 and TOPO could exhibit the distinct synergistic effect for extraction of uranium(VI) from sulfuric acid solution. From the results of the extraction, it was suggested that the composition of synergistic extraction species is (RNH3)UO2(SO4)2·TOPO. The equilibrium constant (K 12) of synergistic extraction reaction has been evaluated, to be 1.07·109. In addition, the integration phenomenon of N1923 and TOPO have been discussed, the integration constant (K 3) is 1.60·102.