IMPROVED METHOD FOR STOPPING A REACTION DURING THE PRODUCTION OF AROMATIC AMINES FROM NITROAROMATICS

摘要

A method for producing aromatic amines by hydrogenation of aromatic nitro compounds comprises the steps: A) supplying aromatic nitro compounds and hydrogen to a reactor and contacting them with a hydrogenation catalyst; and B) stopping the supply of aromatic nitro compounds and hydrogen to the reactor. Step B) is carried out such that: B1) first the supply of aromatic nitro compounds to the reactor is stopped so that any aromatic nitro compounds remaining in the reactor and/or in parts of the installation that are fluidically connected to the reactor upstream react with the hydrogen that is still being supplied, and B2) the supply of hydrogen is stopped after a predetermined time interval and/or once the concentration in aromatic nitro compounds in the gas flow entering the reactor falls below a predetermined value.