Process for recovering cobalt carbonyl catalysts used in the preparation of N-acyl-.alpha.-amino acid derivates by amidocarbonylation

US5756413A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Sandra Bogdanovic · Frankfurt am Main, DE
• Holger Geissler · Mainz, DE
• Klaus Raab · Altötting, DE
• Matthias Beller · Ostseebad Nienhagen, DE
• Hartmut Fischer · Hofheim, DE

Key dates

• Filing date: Dec 5, 1996
• Grant date: May 26, 1998
• Expiry date: Dec 5, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/845
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for recovering the cobalt carbonyl catalyst used, in which a water-soluble cobalt salt is first prepared by addition of acid and this is subsequently precipitated as cobalt hydroxide. This cobalt hydroxide is then reacted with the N-acyl-.alpha.-amino acid derivative for whose preparation the cobalt carbonyl catalyst is intended, and the resulting cobalt-containing melt is converted into the cobalt carbonyl catalyst in the presence of a mixture of carbon monoxide and hydrogen.