Preparation of alkyl pentenoates

US4925972A · kind A · utility

Assignee

• BASF SE

Inventors

• Robert Maerkl
• Wolfgang Harder · Weinheim, DE

Key dates

• Filing date: Jul 12, 1989
• Grant date: May 15, 1990
• Expiry date: Jul 12, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C69/533
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Alkyl pentenoates are prepared by PA0 (a) reacting butadiene or a butadiene-containing hydrocarbon mixture with carbon monoxide and an alkanol in the presence of a tertiary aromatic heterocyclic nitrogen base and a cobalt carbonyl catalyst at from 80.degree. to 160.degree. C. under from 100 to 1,000 bar to obtain a reaction mixture which contains alkyl pentenoate, C.sub.6 -diester, tertiary nitrogen base, alkanol, butadiene, hydrocarbon and by-product, PA0 (b) substantially removing from the reaction mixture obtained any excess hydrocarbon, nitrogen base, alkanol and alkyl pentenoate by distillation to obtain a residue which contains cobalt carbonyl catalyst, PA0 (c) bringing the residue which contains cobalt carbonyl catalyst into contact with a mixture of carbon monoxide and hydrogen at elevated temperature and elevated pressure, and PA0 (d) recycling the residue which contains cobalt carbonyl catalyst into alkyl pentenoate synthesis stage (a).