Preparation of butanedicarboxylic acid esters

US4258203A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Platz
• Rudolf Kummer · Bischofswerda, DE
• Heinz-Walter Schneider · Ludwigshafen, DE

Key dates

• Filing date: Jul 19, 1979
• Grant date: Mar 24, 1981
• Expiry date: Jul 19, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/38
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Multistep process for the preparation of butanedicarboxylic acid by the hydrogenation of carbon monoxide under pressure in the presence of a cobalt carbonyl catalyst, the improvement of heating at a temperature of 250.degree. to 350.degree. C. under superatmospheric pressure the resulting aqueous solution of cobalt carbonyl hydride that has been extracted with butadiene or with mixtures thereof before using in a subsequent step of the multistep process.