Process for removing metallic corrosion products from a contamin

Details Process for removing metallic corrosion products from a contamin Process for removing metallic corrosion products from a contamin

1990-01-26

1991-01-15

Konopka, Paul E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

502 33, 560232, 562519, 562890, 562891, B01J 3868, B01J 3140, C07C 5154, C07C 5112

Patent

active

049853830

ABSTRACT:
In a process for removing the metallic corrosion products from a contaminated catalyst solution produced on carbonylation of methanol and/or methyl acetate and/or dimethyl ether and containing carbonyl complexes of noble metals from group VIII of the Periodic Table of the elements, quaternary organo-phosphorus compounds as organic promoters, 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 noble 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 noble metal carbonyl complex and the organic promoter is extracted from the aqueous phase using C.sub.4 -C.sub.8 -alkanols, the promoter is recovered by evaporating the extractant, the promoter is recombined with the precipitated nobel 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.

REFERENCES:
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patent: 4440570 (1984-04-01), Erpenbach et al.
patent: 4442304 (1984-04-01), Erpenbach et al.
patent: 4521526 (1985-06-01), Hoffman
patent: 4578367 (1986-05-01), Hoffmann
patent: 4746640 (1988-05-01), Erpenbach et al.

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