Process for the recovery of catalyst values

Details Process for the recovery of catalyst values Process for the recovery of catalyst values

C - Chemistry, Metallurgy

22

B

53/168, 252/1.C

C22B 3/26 (2006.01) B01J 31/40 (2006.01) B01J 38/48 (2006.01) C07C 51/573 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2007730

Disclosed is an improved process for the recovery of rhodium catalyst values from "tars" n 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.

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