Catalyst for the preparation of aniline

US5304525A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Otto Immel · Krefeld, DE
• Helmut Waldmann · Leverkusen, DE
• Rudolf Braden
• Christian Frohlich · Krefeld, DE
• Gerhard Friedhofen · Krefeld, DE
• Wilfried Niemeier · Krefeld, DE

Key dates

• Filing date: Apr 21, 1993
• Grant date: Apr 19, 1994
• Expiry date: Apr 21, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of aniline by hydrogenation of nitrobenzene in the gas phase in the presence of a catalyst containing a noble metal is described. The process can be carried out in an improved manner if the catalyst employed is palladium on graphite or petrol coke, as the support, containing 0.001-1% by weight of Pd, based on the total weight of the catalyst, it being possible for the catalyst also to contain, in addition to the Pd, 0.001-0.5% by weight of Ir and/or 0.001-0.3% by weight of Rh, all figures being based on the total weight of the catalyst.