反応 #1153146
ord-e6fbd1aafa0241349ab15a4211021e92
反応条件
実験手順
A stirred vessel is charged with 450 parts of polyphosphoric acid containing 83.0% P2O5. Then 37.5 parts of 2,5-dianilinoterephthalic acid and 112.5 parts of 2,5-di-(4-toluidino)terephthalic acid are introduced at 125° C. with stirring, and the mixture is heated at 125° C. for 1 hour during which ring closure takes place to form the quinacridone. The reaction mixture is then metered over the course of 5 minutes into a second stirred vessel containing 1431 parts of 70% strength phosphoric acid and is hydrolyzed at 25° C. with stirring. During this procedure the temperature rises to 60° C. Following the hydrolysis, the phosphoric acid strength is 80%. The mixture is heated to 120° C. and stirred at 120° C. for 5 hours. It is cooled to 90° C. and the hydrolysis mixture is poured into 6000 parts of water at 25° C. with stirring. Thereafter, the mixture is heated to 90° C. and the mixed-crystal pigment is filtered off with suction, washed to neutrality with water and dried at 80° C.