PROCESS FOR THE RECOVERY OF CATALYST VALUES

摘要

Disclosed is an improved process for the recovery of rhodium catalyst values from "tars" formed during the preparation of acetic anhydride by the rhodium-catalyzed carbonylation of a mixture of methyl iodide and methyl acetate. The process entails an extraction process wherein rhodium-containing tar is extracted using a combination of aqueous hydrogen iodide, methyl iodide and elemental iodine to recover 95 weight percent or greater of the rhodium in the aqueous phase.