반응 #1153145

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2,5-dianilinoterephthalic acid

2,5-di-(4-toluidino)terephthalic acid

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quinacridone

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후처리

1. 1
   workup.STIRRINGstirred at 125° C. for 1 hour during which ring closure

실험 절차

A pressure vessel is charged with 405.7 parts of polyphosphoric acid containing 85.0% P2O5. Then 20.3 parts of 2,5-dianilinoterephthalic acid and 60.9 parts of 2,5-di-(4-toluidino)terephthalic acid are introduced at 80 to 90° C. with stirring, and the mixture is heated at 125° C. and stirred 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 10 seconds into a second pressure vessel containing 184 parts of water and is hydrolyzed at 150° C. under pressure. Following the hydrolysis, the phosphoric acid strength is 89.7%. During this procedure the temperature rises to 180° C. The mixture is cooled to 150° C. and stirred at 150° C. for 3 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 mixed-crystal pigment is filtered off with suction, washed to neutrality with water and dried at 80° C.

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