| 摘要 |
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 DEG to 540 DEG K., under pressures of 1 to 300 bars in the presence of a catalyst system comprised 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, phosphorus, 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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