C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/439, 260/529
C07C 53/08 (2006.01) B01J 31/40 (2006.01) B01J 38/68 (2006.01) C07C 51/373 (2006.01) C07C 51/42 (2006.01) C07C 53/12 (2006.01) C07C 69/16 (2006.01) C07F 15/00 (2006.01)
Patent
CA 2008226
In a process for removing the metallic corrosion products from a contaminated catalyst solution produced on carbon- ylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of rare metals from group VIII of the Periodic Table of the elements, quaternary organo-phosphorus compounds as organic promo- ters, metallic corrosion products and acetic acid, acetic anhydride, ethylidene diacetate and, in some cases, undistillable organic compounds, the catalyst solution is treated with water, the rare metal carbonyl complex and the undistillable organic compounds, if present, being precipitated, while the organic promoter and the metallic corrosion products remain in solution; the aqueous phase is separated from the precipitated rare metal carbonyl complex and the organic promoter is extracted from the aqueous phase using C4-C8-alkanols, the promoter is recovered by the evaporating extractant, the promoter is recombined with the precipitated rare metal carbonyl complex and with the undistillable organic compounds, if present, and the purified catalyst solution is recycled into the process after addition of acetic acid and/or acetic anhydride; finally, the aqueous phase with the metallic corrosion products is purged.
Erpenbach Heinz
Lork Winfried
Prinz Peter
Seidel Andreas
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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