B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/1.C
B01J 31/40 (2006.01) B01J 38/52 (2006.01) C07C 51/48 (2006.01) C07C 51/573 (2006.01) C07C 53/08 (2006.01) C07C 53/12 (2006.01) C07C 69/16 (2006.01)
Patent
CA 1256085
PROCESS FOR PURIFYING AND RECOVERING CONTAMINATED CATALYST SOLUTION OBTAINED IN THE CARBONYLATION OF METHYL ACETATE AND/OR DIMETHYLETHER ABSTRACT OF THE DISCLOSURE Catalyst solution contaminated during the carbonylation of methyl acetate and/or dimethylether, containing carbonyl com- plexes of rhodium, quaternary heterocyclic aromatic nitrogen compounds or quaternary organophosphorus compounds as organic promoters, undistillable organic contaminants,acetic acid, acetic anhydride and ethylidene diacetate, is purified and re- covered: To this end the contaminated catalyst solution is ex- tracted with a dialkylether having from 1-4 carbon atoms and thereby freed from its organic contaminants, acetic acid, acetic anhydride and ethylidene diacetate, and the ether phase is se- parated from a precipitated promoter-containing catalyst com- plex; the ether phase is treated with iodine and/or methyl iodide, a further portion of precipitated promoter-containing catalyst complex is separated and united with the purified ca- talyst complex; the ether phase is distillatively separated in- to its constituents, recovered dialkylether is used for extrac- tion, and fresh catalyst solution is prepared from the recovered mixture of acetic acid, acetic anhydride and ethylidene diacetate and united purified catalyst complex, and the organic contami- nants retained in the residue coming from the ether phase di- stillation are expelled, and the purified catalyst is distil- litively freed from residual dialkylether.
505098
Erpenbach Heinz
Gehrmann Klaus
Lork Winfried
Prinz Peter
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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