Basf Aktiengesellschaft

Basf Aktengesellschaft

Paul Panitz

Rudolf Kummer

Werner Bertleff

Peter Stops

Robert Maerkl

Gunter Schuch

Wilfried Seyfert

Gebhard Kuehn

Wolfgang Harder

Heinz-Walter Schneider

Hubert Lendle

Hans J Wilfinger

Heinrich Reitz

Otto Leman

Guenter Schuch

A process for the continuous preparation of alkyl pentenoates comprises the following steps:

Continuous preparation of alkyl pentenoates

Alkyl pentenoates are prepared by reacting butadiene with carbon monoxide and an alkanol in the presence of a cobalt carbonyl complex and a tertiary, aromatic heterocyclic nitrogen base at from 80.degree. to 160.degree. C. under from 100 to 1,000 bar in the presence of from 0.1 to 10% by volume of hydrogen, based on the amount of carbon monoxide used.

Preparation of alkyl pentenoates

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

Recovery of pyridine or methylpyridines or mixtures thereof from methyl

Carbalkoxy-containing aliphatic compounds are prepared continuously by reacting an olefinically unsaturated aliphatic compound with carbon monoxide and an alkanol in the presence of a cobalt carbonyl catalyst and a tertiary nitrogen base at from 80.degree. to 200.degree. C. and under from 100 to 1,200 bar by an improved process in which carbon monoxide is circulated, and a carbon dioxide content of from 0.1 to 2% by volume is maintained in the carbon monoxide fed to the reaction.

Continuous preparation of carbalkoxy-containing aliphatic compounds

C.sub.1 -C.sub.4 -alkyl pentenoates are obtained from reaction mixtures which contain this and which are obtained by reacting butadiene, or a butadiene-containing hydrocarbon mixture, with carbon monoxide and a C.sub.1 -C.sub.4 -alkanol, in the presence of a cobalt carbonyl catalyst and a tertiary nitrogen base at elevated temperatures and under superatmospheric pressure by a process in which

Obtaining C.sub.1 -C.sub.4 -alkyl pentenoates by distillation

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Paul Panitz