The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 2026
Filed:
Aug. 27, 2020
Covestro Deutschland Ag, Leverkusen, DE;
Covestro Intellectual Property Gmbh & Co. KG, Leverkusen, DE;
Lanxess Deutschland Gmbh, Cologne, DE;
Lennart Sandbrink, Langenfeld, DE;
Bernd Pennemann, Bergisch Gladbach, DE;
Eberhard Zirngiebl, Cologne, DE;
Martina Gerdinand, Bergisch Gladbach, DE;
Hans-Jürgen Quella, Leverkusen, DE;
Daniel Ullrich, Monheim am Rhein, DE;
Marc Williams, Cologne, DE;
Covestro Deutschland AG, Leverkusen, DE;
Lanxess Deutschland GmbH, Cologne, DE;
Abstract
The present invention relates to a process for the preparation of an aromatic amine by hydrogenation of an aromatic nitro compound, comprising the following steps: (I) providing a copper tetramine salt-based impregnation catalyst, in particular an impregnation catalyst obtainable by the incipient wetness method, comprising a metal or metal oxide on a support as a hydrogenation catalyst. At least metallic or oxidic copper (in particular CuO) is present and the mole fraction of Cu based on all metals present is in the range of 075 to 1, and wherein the support comprises shaped silicon-dioxide shaped bodies or silicon-carbide shaped bodies; (II) optionally, activating the hydrogenation catalyst by treating with hydrogen in the absence of the aromatic nitro compound; and (III) reacting the aromatic nitro compound with hydrogen in the presence of the, optionally activated, hydrogenation catalyst to obtain the aromatic amine.