Process for purifying and recovering the contaminated catalyst s

Details Process for purifying and recovering the contaminated catalyst s Process for purifying and recovering the contaminated catalyst s

1990-03-09

1991-03-26

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 31, 502 33, 560232, 562517, 562890, 562891, B01J 3868, B01J 3140, C07C 5308, C07B 4108

Patent

active

050029142

ABSTRACT:
A process for purifying and recovering the contaminated catalyst solution arising from the carbonylation of methanol, methyl acetate and/or dimethyl ether. The solution contains carbonyl complexes of rhodium, quaternary organophosphorus compounds as organic promoters, undistillable organic impurities, and acetic acid, acetic anhydride and ethylidene diacetate. The carbonyl complex of rhodium together with acetic acid, acetic anhydride and ethylidene diacetate are extracted from the contaminated catalyst solution by using a tri-C.sub.3 - to C.sub.8 -alkylphosphine. The trialkylphosphine phase is separated from the promoter phase and is separated into the volatile constituents acetic acid, acetic anhydride and ethylidene diacetate as well as trialkylphosphine. The rhodium carbonyl complex remaining as the residue and the recovered trialkylphosphine is used for further extraction. The contaminated promoter phase is freed of the organic impurities by extraction with dialkyl ethers, carboxylic acid esters or hydrocarbons and, after the extractant phase has been separated off, is recombined with the recovered acetic acid/acetic anhydride and ethylidene diacetate mixture and with the rhodium carbonyl complex and recycled to the carbonylation reactor. The impurities remaining as the residue from a distillation of the extractant phase which has been separated off are removed from the system.

REFERENCES:
patent: 4143066 (1979-03-01), Kalcevic
patent: 4297239 (1981-10-01), Bryant et al.
patent: 4298499 (1981-11-01), Imai
patent: 4371509 (1985-02-01), Grosse
patent: 4629711 (1986-12-01), Erpenbach et al.
patent: 4650615 (1987-03-01), Rizkalla
patent: 4746640 (1988-05-01), Erpenbach et al.
patent: 4795594 (1989-01-01), Dankowski

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