EQUILIBRIA AND KINETICS OF URANIUM EXTRACTION WITH 5,8-DIETHYL-7-HYDROXYDODECAN-6-ONE OXIME IN VARIOUS SOLVENTS

Publisher Website
Google Scholar
Abstract
The extraction of uranium(VI) with 5,8-diethyl-7-hydroxydodecan-6-one oxime (LIX 63; HR) has been studied from the viewpoint of solvent effects. The distribution constant of LIX 63 (KDR) determined between organic solvents and the aqueous phase In creased In the order: n-heptane < n-hexane < kerosene < carbon tetrachloride < chlorobenzene < toluene < chloroform. The extracted species was found to be UO2R2, whose extraction equilibrium constant was evaluated as log Kex= −2.11±0.14 independent of solvent types. This reaction was first-order in metal and second-order in extractant and inverse first-order in hydrogen ion. The apparent rate constant has been found to vary inversely with the square of the KDR value in accordance with the view that the rate-determining step is ascribed to the reaction of UO2R+with the second ligand in the aqueous phase.