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A 500 ml. electromagnetically stirred glass reactor was charged with 5.0 g (0.0168 mole) of 1-nitro-2-carboxyanthraquinone, 100 g of a 4% aqueous solution of sodium hydroxide and 0.25 g of 5% palladium-carbon. The inside of the reactor was purged with hydrogen, and the 1-nitro-2-carboxyanthraquinone was hydrogenated at 50° C. with stirring. In 5 hours, 0.0504 mole of hydrogen was absorbed, whereupon the reaction was stopped. The reaction mixture was filtered to separate the catalyst. The filtrate was oxidized with air with stirring at 20° to 30° C. for 2 hours, and then neutralized with 20% sulfuric acid to a pH of 2 to 3. The crystals precipitated were filtered, washed with water, and dried to afford 4.1 g of 1-amino-2-carboxyanthraquinone in a yield of 91.3%.

1. customThe inside of the reactor was purged with hydrogen
2. customwas hydrogenated at 50° C.
3. filtrationThe reaction mixture was filtered
4. customto separate the catalyst
5. stirringwith stirring at 20° to 30° C. for 2 hours
6. customThe crystals precipitated
7. filtrationwere filtered
8. washwashed with water
9. customdried