| 摘要 |
The preparation of hydrazobenzene by a catalytic alkaline hydrogenation of nitrobenzene with water vapour in alcoholic solution is effected using an alkali that is an alkali metal alcoholate (alkoxide) and/or an alkali metal hydroxide, hydrogenation pressures of >/= 1 bar and temperatures of up to 120 DEG C, and keeping the reaction mixture in turbulent agitation. Industrial practice is by means of an apparatus comprising a temperature controllable reactor and a pump-equipped recirculation loop emanating from the reactor in the region of the liquid column and ending in nozzles which disperse the reacting material finely into the gas space of the reactor.
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