Abstract
The equilibrium studies on the solvent extraction of copper(II) with 5-dodecylsalicylaldoxime, the active component of LIX 860, were carried out at 303 K to clarify the effects of the organic diluent and the aqueous media, together with measurements of the apparent molecular weight and aqueous solubility of the extractant. It was found that the title extractant exists as a monomeric species in the organic diluents, i.e., hexane, cyclohexane and toluene and is sparingly soluble in the aqueous solutions as well as other commercial hydroxyoximes. Copper(II) was extracted as a chelate of the type CuR 2 in the organic solution and the extraction equilibrium constant in hexane is about five times and twice greater than those in toluene and cyclohexane respectively, and further, the extraction equilibrium constant with 5-dodecylsalicylaldoxime was several times greater than those with other commercial hydroxyoximes. The effect of 1-tridecanol as a modifier on the extraction equilibrium was quantitatively clarified by taking account of the formation of the hydrogen bond between the extractant and 1-tridecanol.
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