1-Nitroanthraquinone → 1-Aminoanthraquinone

Participants

Reaction Steps

A slurried mixture of a nitroanthraquinone and water and a 12.0% sodium hydrosulfide aqueous solution were poured simultaneously into a 1,500-volume-part glass-made flask under agitation while maintaining the internal temperature of the vessel at 94°-96° C. The feeding rates of said slurried mixture (nitroanthraquinone concentration in the slurry: 17.27%) and the 12.0% sodium hydrosulfide solution were maintained at 805 part/hr and 722 part/hr, respectively. One hour after start of pouring, draw-out of the reaction mixture from the bottom of the flask was started and the draw-out rate was kept constant at 1527 part/hr. The efflux rate of aminoanthraquinone (as dry cake portion) obtained by filtering and washing the effluent after reaching a steady state in the vessel was 117 part/hr.

Provenance & Evidence