Preparation of phthalic anhydride

US4369327A · kind A · utility

Assignee

• BASF SE

Inventors

• Dieter Stockburger · Havelsee, DE
• Wilhelm Schultz · Havelsee, DE
• Johannes E. Schmidt · Ludwigshafen, DE
• Friedrich Wirth · Ludwigshafen, DE
• Herwig Hoffmann · Bischofswerda, DE
• Bernhard Holzknecht · Ellerstadt, DE
• Klaus Wintermantel · Weinheim, DE

Key dates

• Filing date: Oct 20, 1981
• Grant date: Jan 18, 1983
• Expiry date: Oct 20, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/313
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of phthalic anhydride (PA) of catalytic oxidation of naphthalene or o-xylene with air, a preheated mixture of air and naphthalene or o-xylene being passed into a reactor charged with the catalyst, and the reaction gas leaving the reactor being passed through a separator in which the PA is separated out as a solid, in which process the air fed to the reactor is preheated, before or after the admixture of naphthalene or of o-xylene, by using it to cool the reaction gas in the PA separator.