METHOD FOR PRODUCING PENTENIC ACID C (DOWN ARROW) 1 (DOWN ARROW) - TO C (DOWN ARROW) 4 (DOWN ARROW) - ALKYL ESTERS

摘要

C1-C4-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 C1-C4-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 (a) the liquid reaction mixture freed from excess carbon monoxide is treated with hydrogen at elevated temperatures and under from 5 to 80 bar, (b) hydrocarbons are distilled off from the resulting liquid reaction mixture, (c) the C1-C4-alkyl pentenoate, the alkanol and the nitrogen base are then distilled off under reduced pressure, and (d) the C1-C4-alkyl pentenoate is obtained by fractional distillation from the distillate containing this compound, the alkanol and the tertiary nitrogen base.