FIELD: chemical industry. SUBSTANCE: the product is a mixture of 1,7-disulfo-3,4,9,10- perylenetetracarboxylic acid dianhydres of the empirical formula: C24H8O14S2; the yield 83%; the decomposition temperature 350 C. Reagent 1: 3,4,9,10-perylenetetracarboxylic acid dianhydride. Reagent 2: 15-25 % oleum. Reaction conditions: in the air at 180-240 C. EFFECT: improved synthesis conditions. 2 tbl
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