Extraction of palladium(II) from nitric acid solutions with 1-Benzoyl-3-[6-(3-benzoyl-thioureido)-hexyl]-thiourea

The extraction of palladium (II) from HNO3 solutions with 1-Benzoyl-3-[6-(3-benzoyl-thioureido)-hexyl]-thiourea (Ia) and several monodentate thiourea derivatives in 1,2-dichloroethane has been studied. The effect of HNO3 concentration in the aqueous phase and that of the extractant in the organic phase on the Pd(II) extraction is considered. The stoichiometry of the extracted complexes has been determined. The increasing number of thioamide groups in the molecule of Ia increases its extraction efficiency towards Pd(II). The potentialities of a polymeric resin impregnated with compound Ia for selective extraction of Pd(II) from nitric acid solutions are demonstrated.