Production of acetic anhydride

Details Production of acetic anhydride Production of acetic anhydride

C - Chemistry, Metallurgy

07

C

260/536.5

C07C 53/12 (2006.01) C07C 51/54 (2006.01) C07C 51/56 (2006.01)

Patent

CA 1128545

PRODUCTION OF ACETIC ANHYDRIDE ABSTRACT OF THE DISCLOSURE: The invention relates to an improved process for making acetic anhydride by reacting methyl acetate and/ or dimethylether with carbon monoxide under practically anhydrous conditions, at temperatures of 350 to 575 K, under pressures of 1 to 300 bars, and in the presence of a catalyst system containing noble metals belonging to group VIII of the periodic system of the elements, or compounds thereof, iodine and/or its compounds, and an aliphatic carboxylic acid having 1 to 8 carbon atoms. The improved process is effected in the presence of a catalyst system con- taining, as additional ingredients, a heterocyclic aromatic compound, in which at least one hetero atom is a quaternary nitrogen atom, or a quaternary organo- phosphorus compound, and a zirconium compound being soluble in the reaction mixture.

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