Process for preparing primary amines from aldehydes

US5475141A · kind A · utility

Assignee

• Chemie Linz GmbH · AT

Inventors

• Carlo Kos · Leonding, AT
• Friedrich Hebesberger · Leonding, AT
• Eduard Artner · Linz, AT
• Engelbert Kloimstein · Eferding, AT
• Robert Haar · Linz, AT
• Ernst Lust · Linz, AT

Key dates

• Filing date: Jun 3, 1994
• Grant date: Dec 12, 1995
• Expiry date: Jun 3, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/26
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing primary amines from aldehydes by mixing an aldehyde with a diluent, where in the case of an alcohol or of water as diluent the mixing temperature is at most 5.degree. C. to prevent the formation of the hemiacetal or the aldehyde hydrate, and bringing the mixture into contact with a mixture of ammonia, hydrogen and hydrogenation catalyst, whereby the formation of an imine is prevented, at temperatures of from 60.degree. to 180.degree. C. and pressures of from 20 to 60 bar, at least 15 mol of ammonia being used per mol of aldehyde group, and also an apparatus for carrying out the process.