Production of amine from nitro compound by catalytic hydrogenation, e.g. toluene diamine from dinitrotoluene, uses loop reactor with top spray for recycling part of reaction mixture from loop and reversed flow near bottom

摘要

The production of amines (I) by hydrogenation of nitro compounds (II), carried out in a vertical reactor with length greater than its diameter. It has a spray at the top for introducing educts and reaction mixture and an outlet through which the reaction mixture is pumped into an external cycle. The circulation is reversed in the lower zone of the reactor.