Bergwerksverband Gmbh

Clemens Linden

Georg Kolling

Kurt Handrick

Gunter Droll, Jr

A process for the manufacture of anthraquinone, in which o-benzyl-toluene is oxidized with air or an oxygen-containing gas in an acetic acid solution in the presence of cobalt, manganese and bromine salts as catalysts, to which solution sufficient acetic anhydride is added to bind the reaction water, thereby keeping the acid concentration constant. The crude o-benzoyl-benzoic acid is then esterified with methanol, the methyl ester distilled from the reaction mixture and heated with concentrated sulfuric acid to yield anthraquinone in good yield and of a high degree of purity.

Catalytic oxidative process for the manufacture of anthraquinone from

A process for the manufacture of anthraquinones in which o-benzyl-toluene is first oxidized with 25 to 50 weight-% nitric acid at atmospheric pressure and moderate temperatures, and then further oxidized with a more dilute nitric acid at elevated temperatures and pressures to yield crude o-benzoyl-benzoic acid. The crude product is then esterified with methanol, the methyl ester distilled and, when necessary, recrystallized, and heated with concentrated sulfuric acid to yield anthraquinone in high yield and of a high degree of purity.

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Essen-Bergerhausen, Germany

Clemens Linden