Stripping of Rh–Sn–Cl-loaded alkylated 8-hydroxyquiniline with Na2SO3–HCl

✍ Scribed by Elyse Benguerel; George P Demopoulos

• Publisher: Wiley (John Wiley & Sons)
• Year: 2004
• Tongue: English
• Weight: 131 KB
• Volume: 79
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.953

✦ Synopsis

Abstract

Acidic rhodium(III) chloride solutions pretreated with SnCl~2~ at a ratio Sn(II) : Rh(III) = 3 are contacted with an alkylated 8‐hydroxyquinoline (Kelex 100) to prepare loaded organics which subsequently are subjected to stripping with Na~2~SO~3~–HCl solutions. Rh(III) was found to be stripped selectively involving the following reaction:

where H~2~Q is the protonated form of kelex 100. Direct characterization of the stripped complex and slope analysis confirmed this stripping reaction. Equilibrium was reached within 20 min. A kinetic analysis found the stripping process to be irreversible and to be controlled most probably by the slow release of SnCl~3~^−^ ligand from the intermediate Rh–Q–SO~3~–SnCl~3~ organic complex. Copyright © 2004 Society of Chemical Industry