B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/87
B01J 38/52 (2006.01) B01J 31/40 (2006.01) C07C 43/04 (2006.01) C07C 69/14 (2006.01)
Patent
CA 1280400
PROCESS FOR PURIFYING AND RECOVERING CATALYST SOLUTION CONTAMINATED DURING THE CARBONYLATION OF METHYL ACETATE AND/OR DIMETHYLETHER ABSTRACT OF THE DISCLOSURE Catalyst solution contaminated during the carbonyla- tion of methyl acetate and/or dimethylether. To this end, the contaminated catalyst solution is subjected in a first processing stage to extraction with a dialkylether and al- kanol, each of which has from 1-4 carbon atoms per alkyl group, and thereby freed from its organic contaminants, from acetic acid, acetic anhydride and ethylidene diace- tate, and the ether phase is separated from the purified promoter-containing catalyst solution; next, the ether phase is treated in a second processing stage with iodine and/or methyl iodide; the precipitated promotercontaining catalyst complex is separated and dissolved in the puri- fied catalyst solution coming from the first processing stage; the ether phase is separated into its constituents by distilling it; recovered dialkylether and alkanol are used again in the extraction stage; fresh catalyst solu- tion is prepared from the recovered mixture of acetic acid, acetic anhydride and ethylidene diacetate and from the united purified catalyst solution while residual di- alkylether and alkanol are distilled off, and the organic contaminants retained in the residue of the ether phase distillation are expelled.
533015
Erpenbach Heinz
Gehrmann Klaus
Lork Winfried
Prinz Peter
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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