PREPARATION OF PHTHALIC ANHYDRIDE FROM O-XYLENE

摘要

BASFAKTIENQESELLSCHAFT O.Z.0050/41580 Preparation of phthalic anhydride from o-xylene of the disclosure: Phthalic anhydride is prepared in a multiple tube reactor provided withseparate salt baths, the temperature of the salt bath used for cooling the first layer of catalyst, as regarded in the direction of flow of the reaction mixture, being from 2.degree. to 20.degree.C higher than that of the salt bath(s) associated with the following layer(s).