Process for separating acetone from carbonylation mixtures

Details Process for separating acetone from carbonylation mixtures Process for separating acetone from carbonylation mixtures

1982-08-27

1984-04-24

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 70, 203 82, 203 84, 568387, 568411, B01D 340, C07C 4583

Patent

active

044446241

ABSTRACT:
The disclosure relates to a process for separating acetone from reaction mixtures originating from the reaction of methyl acetate and/or dimethylether with carbon monoxide and optionally hydrogen in the presence of a catalyst system consisting of carbonyl complexes of noble metals of group VIII of the Periodic System of the elements, acetic acid, an organophosphorus or organonitrogen compound, methyl iodide and optionally carbonyl-yielding compounds of common metals. To this end, the disclosure provides for the reaction mixture containing acetic anhydride, acetic acid, ethylidene diacetate, methyl iodide, acetone and methyl acetate which is distilled off from the catalyst solution, or just its low boiler fraction consisting of methyl acetate, methyl iodide and acetone to be subjected wholly or partially to an extractive distillation with acetic acid and for pure methyl iodide to be distilled off; for an acetone/methyl acetate mixture to be distilled off from the acetic acid extract; for this mixture to be separated in known fashion and for the acetic acid extractant to be recycled into the extraction stage, if desired after separation of the final reaction products comprised of acetic anhydride; ethylidene diacetate and acetic acid.

REFERENCES:
patent: 2704271 (1955-03-01), Harrison et al.
patent: 3591463 (1971-07-01), Copelin
patent: 3871970 (1975-03-01), Nienburg et al.
patent: 4252748 (1981-02-01), Hoch et al.
patent: 4364869 (1982-12-01), Muller et al.

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