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

07

C

252/87

C07C 51/09 (2006.01) B01J 23/96 (2006.01) B01J 31/40 (2006.01) C07C 51/573 (2006.01)

Patent

CA 1156643

TITLE PROCESS FOR THE RECOVERY OF CATALYST VALUES ABSTRACT OF THE DISCLOSURE Disclosed is a process for the recovery of catalyst values from a catalyst-tar solution derived from a production system in which acetic anhydride is prepared by carbonylating methyl acetate in the presence of rhodium, lithium and methyl iodide. The catalyst values are recovered by submitting the catylist-tar solution to an extraction using methyl iodide And aqueous hydrogen iodide. The presence of hydrogen iodide in the aqueous phase stabilizes the rhodium in water soluble form and thereby permits the aqueous phase containing the catylist values to be concentrated to remove most of the water prior to recycling to the carbonylation reactor.

388920

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