Patent ID: 8895783

Claim:
A continuous process for preparing at least one aromatic amine, the process comprising hydrogenating of at least one nitroaromatic with hydrogen in a reactor, in the presence of a liquid phase comprising at least one aromatic amine and a gas phase comprising at least the hydrogen, in the presence of a catalyst suspended in the liquid phase at a temperature of from 50 to 250° C. and at a pressure of from 5 to 50 bar, wherein: the pressure in the reactor is maintained essentially constant by continuously adapting an amount of hydrogen fed to the reactor; a total amount of the hydrogen fed to the reactor is monitored; and introduction of the at least one nitroaromatic to the reactor is interrupted if hydrogen uptake in the reactor is not at least 50 mol %, of an amount of hydrogen required for stoichiometric reaction of the at least one nitroaromatic to form the at least one aromatic amine.