CONTINUOUS PROCESS FOR THE PREPARATION OF ACETIC ANHYDRIDE OR MIXTURES OF ACETIC ANHYDRIDE AND ACETIC ACID

摘要

the invention provides a continuous process for preparing acetic anhydride and of achieving the carbonylation of a mixture containing (i) and (ii) methyl iodide, methyl acetate, dimethyl ether and / or in the presence of a rhodium catalyst and a pr omoteur.and in which the concentration of the mixture of mu00e9sitylique carbonyl oxide is suppressed by the presence of a mixture of at least 100 ppm of dissolved ferrous iron and / or cobaltous.