FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing 4-aminodiphenylamine by catalytic reduction of 4-nitrosodiphenylamine with hydrogen. The reduction reaction is carried out under conditions of the compulsory circulation of the reaction mass in organic solvent medium at temperature 45-120°C and under excess pressure 0.25-0.6 MPa with using the highly porous catalyst consisting of ceramic base and metallic palladium applied on it in the amount 1.5-3.5 wt.-%. The proposed method provides the conversion of 4-nitrosodiphenylamine as 99.9% and the yield of 4-aminodiphenylamine as 99.8%. Invention provides simplifying the technology due to absence of stages for activation and passivation of catalyst, reducing consumptions for purification of the ready product and high selectivity of the process.
EFFECT: improved preparing method.
4 cl, 9 ex
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