Process for making acetic anhydride and, if desired, acetic...

Details Process for making acetic anhydride and, if desired, acetic... Process for making acetic anhydride and, if desired, acetic...

C - Chemistry, Metallurgy

07

C

260/529.5, 260/5

C07C 51/12 (2006.01) C07C 51/56 (2006.01) C07C 53/08 (2006.01) C07C 53/12 (2006.01)

Patent

CA 1234150

PROCESS FOR MAKING ACETIC ANHYDRIDE AND, IF DESIRED, ACETIC ACID ABSTRACT OF THE DISCLOSURE: Acetic anhydride and acetic acid are made by reacting methyl acetate and/or dimethylether and, if desired, methanol with carbon monoxide, optionally in the presence of water, at temperatures of 350 to 575 K, under pressures of 1 to 300 bar in the presence of a catalyst system containing noble metals belonging to group VIII of the Periodic System of the ele- ments or their compounds, iodine and/or its compounds and, if desired, carbonyl-yielding non noble metals of groups IV, V, VI, VII or VIII of the Periodic system of the elements, or their compounds and, if desired, an aliphatic carboxylic acid having from 1 to 4 carbon atoms. To this end, a catalyst system containing tetrabutylphosphonium iodide as an additi- onal promoter is used.

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