FIELD: chemistry.
SUBSTANCE: invention refers to methods of producing sulphur trioxide and tetrabromphthalic anhydride. Sulphur trioxide is produced by method involving that the first gas flow containing SO2, SO3 and oxygen and/or air, is supplied to vanadium-containing catalyst layer wherein SO2 is oxidised in SO3, and the second gas flow containing sulphur trioxide is isolated. This method is improved with supplying evaporated sulphur to the first gas flow, so produced mixture is supplied through considerable part of catalyst layer then exposed at one or more temperatures within approximately 450 to 700°C. Sulphur is oxidised to SO2. Consequently the second gas flow isolated from lower tail end of catalyst layer is enriched with sulphur trioxide to be used for producing compounds, such as tetrabromphthalic anhydride.
EFFECT: inventions allow for higher process efficiency.
34 cl, 5 dwg, 2 tbl, 7 ex
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