FIELD: chemical industry. SUBSTANCE: the product: 2,3,5- trimethylbenzoquinone. Reagent 1: 2,3,5,6- trimethylphenol. Reagent 2: oxygen or air. Reaction conditions: in the presence of a heterogeneous catalyst prepared by applying cuprous chloride, ammonium chloride and alkali metal chloride at to aluminium hydroxide a weight ratio of 1:(0.02-0.12):(0.38-0.5):(0.05- 2.02): (0.07-0.30), respectively in the presence of phosphoric acid, and the process is carried out in a solution of anhydrous primary C2-C4-aliphatic alcohol or methyl cellosolve or ethyl cellosolve or a mixture of ethyl cellosolve with ethanol at a trimethyl phenol to catalyst to solvent weight ratio of 1: (0.5-0.75): (4-12), respectively. EFFECT: more efficient preparation process. 1 tbl
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