Method for producing phthalic anhydride

US7772410B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Claus Hechler · Mannheim, DE
• Gerhard Olbert · Dossenheim, DE

Key dates

• Filing date: Dec 21, 2005
• Grant date: Aug 10, 2010
• Expiry date: Sep 21, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/2485
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Processes comprising: (a) providing a reactant comprising a component selected from the group consisting of o-xylene, naphthalene and mixtures thereof, and a gas comprising oxygen; (b) reacting the reactant and the gas in a reaction system, in the presence of a catalyst, to form phthalic anhydride; wherein the reaction system comprises: (i) at least two reaction zones, each reaction zone cooled with a coolant; and (ii) an intermediate cooling zone disposed between a first of the at least two reaction zones and a second of the at least two reaction zones; and wherein the coolant entering the first of the at least two reaction zones has a temperature which is more than 20° C. higher than a temperature of the coolant entering the second of the at leas two reaction zones.