| 摘要 |
PURPOSE:To obtain nitrobenzene useful as a raw material for aniline, intermediate for organic industrial chemicals, etc. in a good selectivity, by nitrating benzene with NO2 or N2O4 in the vapor phase in the presence of a highly active silica alumina catalyst. CONSTITUTION:A vapor-phase mixture of benzene with a nitrating agent, e.g. NO2 or N2O4, preferably NO2, is reacted with a diluent at a given flow rate, preferably an inert gas, e.g. N2, at a given flow rate in the vapor phase continuously while keeping an acidic compound oxide catalyst, e.g. silica alumina, at 150-300 deg.C to nitrate the benzene, and the formed nitrobenzene is separated from the vapor-phase mixture. The silica alumina catalyst to be used exhibits the strong acidity and has a strong acid point such as the Hammett acidity function H0<=-3 or H0<=-8. |
