公开(公告)号：EP1645555B1

公开(公告)日：2011-09-28

申请号：EP04738332.8

申请日：2004-07-02

申请人： Jiangsu Sinorgchem Technology Co., Ltd

发明人： WANG, Nongyue ,  YU, Ruibiao ,  MAO, Xiaohui ,  FENG, Xiaogen ,  CHENG, Qianwen

IPC分类号： C07C211/55 ,  C07C209/36 ,  C07C209/60

CPC分类号： C07C211/55 ,  C07C209/36 ,  C07C209/60 ,  Y02P20/584

摘要： The present invention discloses a method for producing 4-aminodiphenylamine by reacting nitrobenzene with a aniline in the presence of complex base catalyst for condensation and complex powdery catalyst for hydrogenation, which comprises the steps of condensation, separation, hydrogenation, separation II and refining sequentially. The method of the present invention can be carried out continuously. By using the complex base catalyst for the condensation, followed being separated and recycling before the hydrogenation, the problem of heat-sensitive decomposition of the complex base catalyst during the hydrogenation procedure can be avoided. Accordingly, the choice of the hydrogenation catalyst is increased, and lower-cost hydrogenation catalysts can be used. Meanwhile, the apparatus can be selected easily and the industrialization can be achieved simply. The complex base catalyst according to the invention is cheaper. The catalystic activity of the catalyst is high and the condition of the reaction is gentle. Additionally, the complex base catalyst is suitable to a wide range of water content. Accordingly the amount of the by-product is decreased, and the conversion and the selectivity can be increased. The labour intensity of the process control is low. Moreover, corrodible liquid is not generated and the environmental pollution can be reduced. The content of 4­aminodiphenylamine reaches 99% (by weigh), and yield of the industrial- scale production is greater than 95%.