RECOVERY OF 1-BUTENE FROM C.SUB.4-HYDROCARBON MIXTURES CONTAINING 2-BUTENES

摘要

1-Butene is recovered from a C4-hydrocarbon mixture which contains 2-butenes and may or may not contain 1-butene by catalytic isomerization of the 2-butenes to 1-butene at elevated temperatures and isolation of the 1-butene, by a process in which the said isomerization is carried out in the presence of an acidic catalyst at from 150 to 500.degree.C, the isomerization mixture obtained from the isomerization zone is fed into a distillation zone, 1-butene is taken off at the top of the distillation zone, a fraction containing 2-butenes is taken off in the lower third of the distillation zone and fed into the isomerization zone, and the starting C4hydrocarbon mixture which contains 2-butenes and may or may not contain 1-butene is fed to the distillation zone and/or the isomerization zone.