PROCESS FOR THE RECOVERY OF RHODIUM

摘要

A process for the recovery of rhodium from an organic reaction mixture containing rhodium/phosphite ligand complex, phosphite degradation products and high-boiler organic compounds, wherein A) the organic reaction mixture is subjected to an aqueous oxidative and/or acidic treatment, resulting in an aqueous-polar organic two-phase mixture, B) the aqueous phase is removed, C) solution of lipophilic phosphine and/or lipophilic phosphite in a non-polar solvent is added to the organic phase, which solvent is immiscible with the polar organic phase, resulting in a two-phase mixture containing a non-polar organic phase rich in rhodium and lipophilic phosphine and/or lipophilic phosphite and a polar organic phase rich in phosphite degradation products and high-boiler organic compounds, or the polar organic phase is extracted with an immiscible non-polar organic solvent, resulting in a two-phase mixture containing a non-polar organic phase rich in phosphite degradation products and a polar organic phase rich in rhodium, D) the non-polar organic phase is separated from the polar organic phase.