Preparation of amines and aminonitriles

US5789621A · kind A · utility

Assignee

• BASF SE

Inventors

• Werner Schnurr · Herxheim, DE
• Guido Voit · Freinsheim, DE
• Klemens Flick · Herxheim, DE
• Rolf Fischer · Heidelberg, DE

Key dates

• Filing date: Aug 8, 1996
• Grant date: Aug 4, 1998
• Expiry date: Aug 8, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing an NH.sub.2 -containing compound by hydrogenating a compound containing at least one unsaturated carbon-nitrogen bond with hydrogen in the presence of a catalyst at temperatures not below room temperature and elevated hydrogen partial pressure in the presence or absence of a solvent which process includes the following steps: PA0 a) using a catalyst comprising a cobalt- and/or iron-containing catalyst, and PA0 b) after the conversion based on the compound to be hydrogenated and/or the selectivity based on the desired product has or have dropped below a defined value or the amount of an unwanted by-product has risen beyond a defined value, interrupting the hydrogenation by stopping the feed of the compound to be hydrogenated and of the solvent, if used, PA0 c) treating the catalyst at from 150.degree. to 400.degree. C. with hydrogen using a hydrogen pressure within the range from 0.1 to 30 MPa and a treatment time within the range from 2 to 48 h, and PA0 d) subsequently continuing the hydrogenation of the compound containing at least one unsaturated carbon-nitrogen bond.