US 4,777,322 AGranted

Obtaining but-2-enes from C.sub.4 -hydrocarbon mixtures which contain but-1-ene and may or may not contain but-2-enes

AssigneeBASF SE

InventorsWolfgang Hoelderich, Alfred Lindner, Wolf D. Mross, Max Strohmeyer, Klaus Volkamer

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Abstract

But-2-enes are obtained from C.sub.4 -hydrocarbon mixtures which contain but-1-ene and may or may not contain but-2-enes by catalytic isomerization of the but-1-ene to but-2-enes in an isomerization zone at elevated temperatures by a process in which the isomerization is carried out in combination with a distillative separation zone, the said hydrocarbon mixture being fed to the isomerization zone and/or distillative separation zone, the isomerization mixture obtained from the isomerization zone is passed into the distillative separation zone, a but-1-ene-containing fraction is removed above the lower third of the distillative separation zone and passed into the isomerization zone, and the but-2-enes or a fraction containing these are or is removed in the lower third of the distillative separation zone.

Claims13

Dependent claims

A process for obtaining butenes-2 from a C.sub.4 -hydrocarbon mixture which contains butene-1 and n-butane and may or may not contain butenes-2, comprising

(a) feeding the starting C.sub.4 -hydrocarbon mixture to the isomerization zone and/or distillative separation zone;
(b) isomerizing the butene-1 in an isomerization zone in the presence of an acidic catalyst at from 100.degree. to 350.degree. C.;
(c) passing the isomerization mixture obtained from the isomerization zone into a distillation separation zone;
(d) removing a butene-1-containing fraction which additionally contains trans-butene-2 above the lower third of the distillative separation zone, and passing it to the isomerization zone;
(e) removing at the same time an n-butane-containing fraction from the distillative separation section at a point above the lower third of the distillative separation zone;
and
(f) removing the butenes-2 or a fraction containing these in the lower third of the distillative separation zone.

4 more elements

Dependencies are inferred from the claim text.