Basf Aktiengesellschaft

Wilhelm Schultz

Herwig Hoffmann

Friedrich Wirth

Johannes E Schmidt

Dieter Stockburger

Klaus Wintermantel

Bernhard Holzknecht

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.

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Gruenstadt, Germany

Wilhelm Schultz