1988 Volume 21 Issue 4 Pages 363-368
The kinetics of solvent extraction of copper(II) from aqueous sodium chloride solution with 2-ethylhexanal oxime in toluene was investigated, along with the aqueous distribution and the interfacial adsorption equilibrium of the extractant. 2-Ethylhexanal oxime was found to have rather high aqueous solubility and interfacial activity. The extraction rate was found to have a first-order dependence with respect to the concentration of neutral copper(II)-dichloro complex, CuCl2, and a second-order dependence with respect to that of the extractant. From these concentration dependencies of the reactant species, the extraction rate was inferred to be controlled by desorption of the final 1:2 metal:reagent complex from the interface brought about by substitution with the extractant molecule.
