Solvent extraction equilibria of palladium(ll) complex with 5,8-diethyl-7- hydroxydodecan-6-one oxime in some organic diluents

Abstract

The extraction equilibrium behaviour of palladium (II) from aqueous chloride solution with 5,8-diethyl- 7-hydroxydodecan-6-one oxime (LIX 63) in seven organic solvents has been studied. The overall extraction equilibrium is represented by the expression:<br><br>Pd² + 2 HL₍₀₎ <img src='http://www.niscair.res.in/jinfo/equation66.gif' border=0> PdL₂₍₀₎+2H^-<br><br> The distribution constant (K_DR) of LlX 63, determined between the organic solventsand water, increases in the order: <i>n</i>-heptane < <i>n</i>-hexane <carbon tetrachloride < benzene <dichloromethane < toluene < chloroform. The extraction equilibrium constant (<em>K</em>_ex ) is found to be independent of the solvent. Acid dissociation constant of the reagent LlX 63 is determined from 70% (vol/vol) ethanol-water medium and the overall extraction is predicted to be independent of the nature of solvent.