Verfahren zur Herstellung von aromatischen Aminen

Die Erfindung betrifft ein Verfahren zur Hydrierung von Nitroaromaten zu aromatischen Aminen in der Gasphase mit Wasserstoff an in stationären oder quasi-stationären Betten angeordneten Katalysatoren in einem Reaktor, bei dem der in dem Reaktor befindliche Katalysator kontinuierlich oder in periodischen Abständen zumindest teilweise ausgetauscht wird, wobei innerhalb von 20 Tagen mindestens 10% des Katalysators ausgetauscht werden. Producing aromatic amine compound (I), comprises hydrogenation of nitro aromatic compound (II) with hydrogen in a gas phase and in the presence of a catalyst arranged in a stationary or quasi-stationary-bed in a reactor, where: the catalyst in the reactor is at least partially exchanged continuously within a period of 20 days from the start of the hydrogenation or at periodic intervals within 20 days after the start of each operating period; and the operating period is a period between two at least partially implemented catalyst-exchange processes including the initial filling of the reactor. Producing aromatic amine compound of formula (I) comprises hydrogenation of nitro aromatic compound of formula (II) with hydrogen in a gas phase and in the presence of a catalyst arranged in a stationary or quasi-stationary-bed in a reactor, where: the catalyst in the reactor is at least partially exchanged continuously within a period of 20 days from the start of the hydrogenation or at periodic intervals within 20 days after the start of each operating period; the operating period is a period between two at least partially implemented catalyst-exchange processes including the initial filling of the reactor; and at least 10% of the catalyst is exchanged. R2 : H, CH 3or ethyl; R1 : amino or R2; and R3 : nitro or R2. [Image].