반응 #1690575

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2,5-dianilinoterephthalic acid

2,5-di(3-toluidino)terephthalic acid

2,5-di(3-chloro-anilino)terephthalic acid

P2O5

→

quinacridone

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후처리

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

실험 절차

465 parts of polyphosphoric acid, containing 85.0% P2O5, are introduced into a pressure vessel. Then 83.8 parts of 2,5-dianilinoterephthalic acid, 4.6 parts of 2,5-di(3-toluidino)terephthalic acid and 4.6 parts of 2,5-di(3-chloro-anilino)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 2095 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.

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