Process for making acetic anhydride

Details Process for making acetic anhydride Process for making acetic anhydride

C - Chemistry, Metallurgy

07

C

260/536.5

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

Patent

CA 1167067

PROCESS FOR MAKING ACETIC ANHYDRIDE ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making acetic anhydride wherein methyl acetate and/or dimethylether (is) are reacted with carbon monoxide under practically anhydrous conditions at temperatures of 390 to 540 K, under pressures of 1 to 300 bars in the presence of a catalyst system com- prised of noble metals belonging to group VIII of the Periodic System of the elements or their compounds, iodine and/or its compounds and a tertiary or quaternary organic nitrogen, phos- phorus, arsenic or antimony compound. More particularly, use is made of a catalyst system containing vanadium or niobium or their compounds as additional constituents, the catalyst system being used in combination with reaction gas containing carbon monoxide and 5 to 30 volume % hydrogen.

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