Process for making acetic anhydride

US4529560A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wilhelm Vogt · Lichtenau, DE
• Erhard Jagers · Bornheim, DE
• Hermann Glaser · Lechenich, DE

Key dates

• Filing date: Jul 19, 1983
• Grant date: Jul 16, 1985
• Expiry date: Jul 19, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/56
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The disclosure relates to a process for making acetic anhydride by reacting methyl acetate and/or dimethylether with carbon monoxide, which may be used in admixture with up to 30 volume % hydrogen, under practically anhydrous conditions at temperatures of 390.degree. to 540.degree. K., under pressures of 1 to 300 bars in the presence of a catalyst system containing nickel or nickel compounds, iodine and/or its compounds as well as a tertiary or quaternary organic nitrogen, phosphorus, arsenic or antimony compound. More particularly a catalyst system is used which contains vanadium or niobium or a compound thereof as an additional constituent.