Transition metal-catalyzed butene oligomerization uses a butene-rich stream obtained by extractive distillation, distillative separation, washing and drying from a stream containing saturated and unsaturated 4C hydrocarbons

Oligomerization of butenes with a transition metal catalyst using a hydrocarbon feed wholly or partly of a stream (1) containing predominantly butene and obtained by separation from a stream (2) with a low butenes content is such that stream (1) is obtained by extractive distillation and distillative separation from a stream (2) containing saturated and unsaturated 4C hydrocarbons, followed by washing and drying. Oligomerization of butenes with a transition metal catalyst using a hydrocarbon feed wholly or partly of a stream (1) containing predominantly butene and obtained by separation from a stream (2) with a low butenes content is such that stream (1) is obtained by (A) extractive distillation of a stream (2) containing saturated and unsaturated 4C hydrocarbons using a polar extractant to give a saturated hydrocarbon-enriched top fraction (3) and a sump fraction (4) enriched in unsaturated hydrocarbons and containing the extractant; (B) distillative separation of sump fraction (4) to give a top fraction (5) containing butene as unsaturated hydrocarbon and a sump fraction (6) containing the extractant; (C) washing at least a part of fraction (5) with water or an aqueous solution; and (D) drying fraction (5) to give an anhydrous butene-containing hydrocarbon stream. Die Erfindung betrifft ein Verfahren zur Oligomerisierung von Butenen, bei dem ein Strom, der überwiegend Butene enthält, welcher durch Abtrennung aus einem Strom von Kohlenwasserstoffen mit geringerem Gehalt an Butenen, Wäsche und Trocknung erhalten wurde, der Oligomerisierung zugeführt wird.