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AssigneeBASF SE
InventorsAndreas Raichle, Stefanie Haase, Holgar Braunsberg, Johannes Buettner, Ulrich Penzel, Samuel Neto
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The present invention relates to a continuous process for preparing at least one aromatic amine by hydrogenation of at least one nitroaromatic by means of hydrogen, where a liquid phase comprising at least the aromatic amine and a gas phase comprising at least hydrogen are present, in the presence of a catalyst suspended in the liquid phase at a temperature of from 50 to 250° C. and a pressure of from 5 to 50 bar, wherein the pressure in the reactor is kept essentially constant by continuous adaptation of the amount of hydrogen fed to the reactor, the total amount of hydrogen fed to the reactor is monitored and the introduction of the at least one nitroaromatic is interrupted if the hydrogen uptake in the reactor is not at least 50 mol % of the amount of hydrogen required for stoichiometric reaction of the at least one nitroaromatic to form the at least one aromatic amine.
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,
Dependencies are inferred from the claim text.