Patent ID: 8835688
Filing Date: 2014-09-16
Classification: B01J,C07C

Abstract:
1. A process for preparing an aromatic amine, the process comprising: hydrogenating a nitroaromatic with hydrogen in the presence of a suspended catalyst in a liquid phase and in a reactor, thereby obtaining the aromatic amine, wherein at one end of the reactor is a driving jet nozzle via which a reaction mixture from a bottom region of the reactor is injected via an external loop into the one end of the reactor, the process comprises introducing the nitroaromatic at the one end of the reactor with an inlet that is distinct from the driving jet nozzle, the process further comprises introducing hydrogen, at a correct fill height of the reactor, direct physical contact between the inlet for the nitroaromatic and the liquid phase occurs neither in the reactor nor in a pumped circuit, either in an operating state or on shutting down, and a measuring instrument is configured to detect partial or complete blocking of the inlet for the nitroaromatic after improper contact between the inlet for the nitroaromatic and the liquid phase in the reactor.