تفاعل #1690571

معادلة التفاعل

P2O5

2,5-dianilinoterephthalic acid

2,5-di(3-chloro-4-methylanilino)terephthalic acid

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quinacridone

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONare introduced into a pressure vessel
2. 2
   درجة الحرارةthe mixture is heated at 125° C. for 1 hour during which ring closure

الإجراء التجريبي

380 parts of polyphosphoric acid, containing 85.0% P2O5, are introduced into a pressure vessel. Then 68.5 parts of 2,5-dianilinoterephthalic acid and 7.6 parts of 2,5-di(3-chloro-4-methylanilino)terephthalic acid are introduced with stirring at from 80 to 90° C. 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 introduced into a second pressure vessel where it is hydrolyzed under pressure and with stirring with a mixture of 1712 parts of 30% phosphoric acid at 140° C. During this hydrolysis the temperature rises to 155° C. The mixture is stirred at 155° C. for 0.5 hour. Then it is cooled to 60° C. and the mixed crystal pigment is filtered off with suction, washed to neutrality with water and dried at 80° C.

المصدر