FIELD: oil and gas industry.
SUBSTANCE: invention refers to application of a honeycomb catalyst, i.e. a catalyst with three or more beds for making phthalic anhydride by vapour-phase oxidation of orthoxylene and/or naphthalene. There is described application of the catalyst for making phthalic anhydride by vapour-phase oxidation of orthoxylene and/or naphthalene containing at least one bed from gas intake, the second bed closer to a gas output, and the third bed even closer to the gas output or at the gas output; and the catalyst beds, preferentially all of them, include an active material with TiO2, and activity of the first catalyst bed is higher than that of the second bed. There is also described method for making phthalic anhydride, according to which gaseous flow containing orthoxylene and/or naphthalene, and also molecular oxygen, at higher temperature are passed through the three-bed or honeycomb catalyst described above.
EFFECT: maintained high activity combined with very high selectivity.
27 cl, 4 ex, 6 tbl
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