Method for producing maleic anhydride

US7087767B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jens Weiguny · Freinsheim, DE
• Wilhelm Ruppel · Mannheim, DE
• Mark Duda · Ludwigshafen, DE

Key dates

• Filing date: Jul 22, 2003
• Grant date: Aug 8, 2006
• Expiry date: Jul 22, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms by means of oxygen-containing gases at from 350 to 500° C. in the presence of a volatile phosphorus compound over a vanadium-, phosphorus- and oxygen-containing catalyst in a shell-and-tube reactor unit having at least one reaction zone cooled by means of a heat transfer medium, in which the temperature and/or the amount of the heat transfer medium flowing into the first (relative to the feed direction) reaction zone are set so that the mean temperature of the heat transfer medium in the first reaction zone TSB(1st zone), which is calculated as the mean of the inflow temperature and the outflow temperature of the heat transfer medium, is in accordance with the formulae (I) and (II)TSB(1st zone)≦TR(1st zone)−TSafety(1st zone)  (I)TSB, Ymax(1st zone)−TA(1st zone)≦TSB(1st zone)≦TSB, Ymax(1st zone)+TB(1st zone),  (II)where