Process for producing acetic anhydride and acetic acid.

摘要

In the process for producing acetic anhydride and acetic acid by reacting methanol and methyl acetate, optionally together with dimethyl ether, with carbon monoxide, acetic anhydride and acetic acid are effectively produced with the use of a sequence of production facilities by carrying out separation of the low-boiling-point fraction consisting mainly of methyl iodide, methyl acetate and dimethyl ether with the use of at least two distillation zones, separating the catalyst of drops entrained from the vapor-liquid separation zone in at least one distillation zone and further by controlling the pressurization of the vapor-liquid separation zone and the above distillation zones under 5 bar to a pressure being larger than the atmospheric pressure.