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Into a 300 ml glass reactor equipped with a reflux condenser and a stirrer, and 50 g (0.207 mol) of the mixture (1:1) of the 3,4,5,6-tetrafluorophthaloyldifluoride and the 3,3,4,5,6,7- hexafluoro-1-[3H]-isobenzofuranone, 59.3 g (0.31 mol) of 2,4-dichlorobenzoic acid and 100 ml of xylene were charged, and the mixture was reacted at 150° C. for 12 hours with vigorous stirring. Then, the reaction mixture was separated by distillation to obtain 32.8 g of tetrafluorophthalic anhydride. The yield was 72.05%.

1. customInto a 300 ml glass reactor equipped with a reflux condenser and a stirrer
2. customthe mixture was reacted at 150° C. for 12 hours with vigorous stirring
3. customThen, the reaction mixture was separated by distillation