Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Andre Lago

Peter Lehner

Karl-Heinz Wilke

Franz-Ulrich Von Gehlen

Stefan Wershofen

Michael Merkel

Hans-Georg Pirkl

Stephan Schubert

Markus Dugal

Knut Sommer

Erwin Dieterich

Ido Schwarz

Susanne Buchholz

Holger Orzesek

Benie Marotz

The invention relates to a process for the continuous preparation of aromatic amines by hydrogenation of the corresponding nitroaromatics in the presence of catalysts arranged in reaction spaces, in which an adiabatically operated reaction space RA is connected downstream of an isothermally operated reaction space RI and RA additionally also has a separate feed for the nitroaromatic to be hydrogenated, RI is fed with the nitroaromatic to be hydrogenated from the start to the end of the hydrogenation, and the product mixture emerging from RI is fed into RA from the start to the end of the hydrogenation, wherein RA can additionally be fed via the separate feed with the nitroaromatic to be hydrogenated.

Process for preparing aromatic amines

Aromatic amines are produced by adiabatic hydrogenation of nitroaromatic compounds in the gas phase on one or more fixed catalysts. The nitroaromatic reactant is passed over the catalyst under pressure and at elevated temperature with hydrogen, water, optionally nitrogen and substantially in the absence of the aromatic amine produced from the nitroaromatic.

Process for producing aromatic amines

Crude aniline is produced by hydrogenating nitrobenzene in the presence of a catalyst. This crude aniline is then purified by means of a single-step or multi-step distillation process in which aqueous alkali metal hydroxide solution is added to the crude aniline prior to distillation and/or during distillation of the crude aniline.

Process for preparing aniline

Growing community of inventors

Hamburg, Germany

Andre Lago