... -029-1) the production method: To 1 - amino-anthraquinone -2 - carboxylic acid (2 - Anthraquinonecar-boxylic acid ,1-amino-) as raw materials, the medium in dichlorobenzene ... -based, the condensation with hydrazine hydrate, and then fuming sulfuric acid was the product of closed-loop. After filtering, crushing, drying ...