SOLVENT-EXTRACTION OF PLATINUM(IV) WITH A NOVEL SULFUR-CONTAINING EXTRACTING REAGENT

A novel sulfur-containing solvent extraction reagent, 3,3-diethylthiet ane (DETE) was synthesized and its extraction mechanism of platinum (I V) from aqueous hydrochloric acid solution was investigated at 30 degr ees C in terms of the equilibrium distribution and extraction kinetics as well as its aqueous distribution and interfacial adsorption equili brium. Toluene was used as a diluent. It was elucidated that platinum( IV) is extracted as a solvated complex of the type, PtCl4.4DETE.DETE w as found to have no interfacial activity and the aqueous partition coe fficient as high as 8.17x10(-4). Extraction rate was measured by using a vigorously stirred cell. It was of the first order with respect to DETE while it is Oth and inversely first order with respect to chlorid e ion in its low and high concentration region; this result was interp reted in terms of the classical hetero-phase homogeneous reaction mode l.