PURPOSE: To obtain anthraquinone industrially in high selectivity for a long time, by catalytically oxidizing 2-methyldiphenylmethane in the vapor phase with air or a gas containing molecular oxygen in the presence of a catalyst prepared by mixing vanadium oxide with Al2O3, etc. to give a catalytically active substance.
CONSTITUTION: 2-Methyldiphenylmethane is catalytically oxidized in the vapor phase with air or a gas containing molecular oxygen in the presence of a catalyst, consisting of vanadium oxide and one or more selected from Al2O3, ZrO2 and SnO2, and prepared by mixing one or more compounds preferably selected from an alkali metal, Tl, P and Sb in an amount of 0.01W10wt% expressed in terms of the oxide having the maximal valence to give a catalytically active substance at 300W500°C and 500W10,000hr-1 (S.T.P) to afford anthraquinone. The mixing weight ratio of the catalytically active substance is 1W30% vanadium oxide and 20W99% Al2O3 and/or ZrO2 and/or SnO2.
YONEDA TADAHIRO
NAKAHARA SABUROU
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