Shell-and-tube reactor for preparing maleic anhydride

US9522374B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Gerhard Olbert · Dossenheim, DE
• Hans-Jürgen Bassler · Eislingen/Fils, DE
• Michael Steiniger · Neustadt, DE

Key dates

• Filing date: Nov 9, 2010
• Grant date: Dec 20, 2016
• Expiry date: Nov 18, 2032

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/0286
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Apparatus for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a stream containing hydrocarbons having at least 4 carbon atoms per molecule, which includes a reactor with reaction tubes into which a solid-state catalyst over which the exothermic reaction of the stream with an oxygen-comprising gas stream takes place is introduced and one or more pumps and heat exchangers located outside the reactor and through which a heat transfer medium formed by a salt melt flows through the intermediate space in the reactor between the reaction tubes and takes up the heat of reaction, with the temperature of the melt being in the range from 350 to 480° C. The reaction tubes are made of a heat-resistant alloy steel which includes at least 0.5% by weight of chromium or at least 0.25% by weight of molybdenum or both.