Ammonia → Disperse Blue 60

Participants

Reaction Conditions

Reaction Steps

225.2 g of 3-methoxypropylamine are charged to a 750 ml sulfonating flask and heated to 40° C. With stirring, 141.2 g of 1,4-diaminoanthraquinone-2,3-dicarboximide are added over 3 hours. The ensuing reaction is slightly exothermic, with evolution of NH3. The viscous suspension is stirred for another hour at 40°-45° C., then cooled to 20° C. and further stirred for one hour. The precipitated product is filtered with suction and washed with 300 ml of methanol and then with 300 ml of water, affording 226.6 g of N-(3-methoxypropyl)-1,4-diaminoanthraquinone-2,3-dicarboximide [dye of formula (3)]. After optional replenishment with fresh 3-methoxypropylamine, the mother liquor can be re-used for a new batch.

Provenance & Evidence