Preparation of cyclic amines

US5663438A · kind A · utility

Assignee

• BASF SE

Inventors

• Ulrich Kohler · Mannheim, DE
• Frank-Friedrich Pape · Kleinniedesheim, DE
• Matthias Irgang · Heidelberg, DE
• Joachim Wulff-Doring · Bischofswerda, DE
• Michael Hesse · Westlake Village, US
• Peter Polanek · Weinheim, DE

Key dates

• Filing date: Aug 17, 1995
• Grant date: Sep 2, 1997
• Expiry date: Aug 17, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a phenyl amine which may be substituted by alkyl or cycloalkyl in which the corresponding cyolohexylamine is reduced at temperatures of 150.degree. to 300.degree. C. and pressures of 0.01 to 50 bar in the presence of a heterogeneous dehydrogenation catalyst consisting essentially of palladium or a palladium/platinum mixture supported on carrier consisting of the oxides of rare earth metals and and metals of Group IVb of the Periodic Table of Elements, with the proviso that the palladium/platinum mixture may also be supported on an alumina carrier. The cyclohexylamine reactant can be advantageously prepared by reacting the corresponding phenol with ammonia and hydrogen at 100.degree. to 250.degree. C. in the presence of the same heterogeneous catalyst as a preliminary step to provide a two stage process using the same catalyst in both stages.