Process for the catalytic hydrogenation of nitrobenzene

US4265834A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Udo Birkenstock · Ratingen, DE
• Burkhard Lachmann · Rotterdam, NL
• Josef Metten · Krefeld, DE
• Herbert Schmidt · Friedberg, DE

Key dates

• Filing date: Aug 16, 1979
• Grant date: May 5, 1981
• Expiry date: Aug 16, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the hydrogenation of nitrobenzene to aniline is described wherein the nitrobenzene is contacted with hydrogen in the presence of a multi-component supported catalyst containing 1 to 20 grams of noble metal per liter of support and 1 to 20 grams per liter of support of one or more transition metal of the Groups IVa, Va, or VIa of the Periodic Table. The catalyst can contain 1 to 20 grams per liter of support of a further transition group element or of a member of the main group. The catalyst is one which has been prepared by a process involving pretreatment of the support with a base prior to impregnation with the catalytically active substances, followed by drying to a residual moisture content of less than 10 percent of the maximum absorbency of the support.