The main purpose of this article is to study the function of catalyst promoters, such as SO42-/Fe2O3, SO42-/Fe2O3 supported by active carbon and active carbon plus fuming sulfuric acid, in the reaction between chlorine and acetic acid which used acetic anhydride as catalyst. We found that SO42-/Fe2O3 supported by active carbon has the highest activity among these catalyst promoters in this reaction.To a certain extent, not only the production of MCA and reaction velocity can be raised, but also the production of DCA can be depressed.
