| 摘要 |
PURPOSE:To prepare aniline in extremely high purity, by carrying out the catalytic hydrogenation of nitrobenzene in the presence of a noble metal catalyst and a specific compound keeping the concentration of nitrobenzene at a low level. CONSTITUTION:Aniline is prepared by the catalytic hydrogenation of nitrobenzene in the presence of a compound selected from an alkali metal hydroxide, alkali metal carbonate, alkali metal bicarbonate, zinc acetate and zinc nitrate, using a noble metal catalyst. The reaction is carried out keeping the nitrobenzene concentration in the aniline reaction liquid at <=0.5wt%. The reaction pressure is preferably 1.5-10atm, and the reaction temperature is preferably 150-250 deg.C. A high purity aniline essentially free from unreacted nitrobenzene and having extremely low content of nucleus-hydrogenated product, can be prepared by this process. |
