Recovery of pyridine or methylpyridines or mixtures thereof from methyl butanedicarboxylate containing reaction mixtures

US4810798A · kind A · utility

Assignee

• BASF SE

Inventors

• Hubert Lendle · Ludwigshafen, DE
• Paul Panitz · Worms, DE
• Wilfried Seyfert · Bad Dürkheim, DE
• Peter Stops · Altrip, DE

Key dates

• Filing date: Nov 12, 1987
• Grant date: Mar 7, 1989
• Expiry date: Nov 12, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/58
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Pyridine or methylpyridines or mixtures thereof are recovered from methyl butanedicarboxylate containing reaction mixtures obtained by reaction of methyl pentenoate with carbon monoxide and methanol in the presence of pyridine, methylpyridines or mixtures thereof and also cobalt catalysts at elevated temperatures and under superatmospheric pressure and subsequent treatment with molecular oxygen containing gases in aqueous acetic acid by PA1 (a) separating the reaction mixture on the one hand into an aqueous phase containing cobalt acetate, pyridine, methylpyridines or mixtures thereof, acetic acid and methanol and on the other an organic phase containing methyl butanedicarboxylate, by-products, unconverted methyl pentenoate, acetic acid and also pyridine, methylpyridines or mixtures thereof, PA1 (b) extracting the organic phase obtained in step (a) with aqueous acetic acid to obtain an aqueous extract containing pyridine or methylpyridines or mixtures thereof as well as acetic acid, PA1 (c) combining the aqueous extract obtained in step (b) with the aqueous phase from step (a) and PA1 (d) isolating pyridine, methylpyridines or mixtures thereof by distillation from the aqueous solut…