Sodium Hydroxide → 1-Aminoanthraquinone

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Reaction Steps

100 parts by weight of 5-nitrotetrahydroanthraquinone is added to and suspended in 1500 parts by weight of ethanol, to which is added 38.5 parts by weight of a 40 wt% sodium hydroxide aqueous solution, followed by agitation at about 75°C for 3 hours. Then, the resultant solution is cooled down to about 10°C, followed by filtration, washing with water and dripping. The resulting wet cake is then introduced into 1500 parts by weight of water for suspension, into which is dropped 990 parts by weight of a 16 wt% sodium sulfide aqueous solution at 95°C over a period of about 30 min with agitation, followed by further agitation at 95°C for 1 hour. The resultant solution is subjected to filtration followed by cooling to crystalize 1-aminoanthraquinone, then the 1-aminoanthraquinone is separated by filtration, washed with water and dried at 85°-95°C. The purity of 1-aminoanthraquinone thus obtained is determined by a KBr method using an infrared absorption spectrum.

Provenance & Evidence