METHOD OF REMOVING ACETONE FROM STREAM CONTAINING ACETONE, METHYL ACETATE AND METHYL IODIDE Russian patent published in 2014 - IPC C07C45/83 C07C45/82 C07C49/08 C07C51/235 

FIELD: chemistry.

SUBSTANCE: invention relates to a separation method intended for removing acetone from a mixture comprising acetone, methyl acetate and methyl iodide. The method includes the following steps: (a) feeding said stream comprising acetone, methyl acetate and methyl iodide into a first distillation zone; (b) feeding acetic acid into said first distillation zone, either by addition of acetic acid to said stream comprising acetone, methyl acetate and methyl iodide or by feeding acetic acid directly to the first distillation zone at one or more points at or above the point of feeding said stream comprising acetone, methyl acetate and methyl iodide into the first distillation zone at step (a), or a combination of both; (c) removing from the first distillation zone a light fraction stream comprising methyl iodide and a heavy fraction stream comprising acetone, methyl acetate, acetic acid, and a reduced amount of methyl iodide; (d) feeding into a second distillation zone the heavy fraction stream from step (c); (e) removing from the second distillation zone a light fraction stream comprising methyl acetate and methyl iodide and a heavy fraction stream comprising acetone, methyl acetate and acetic acid; (f) feeding the heavy fraction stream from step (e) into a third distillation zone; and (g) removing from the third distillation zone a light fraction stream comprising methyl acetate and acetone and a heavy fraction stream comprising methyl acetate and acetic acid.

EFFECT: invention relates to a method of producing acetic anhydride or combined production of acetic anhydride and acetic acid.

24 cl, 1 dwg, 1 ex, 1 tbl