The invention relates to a column (K) with separative installations (E) for separating a mixture of hydrocarbons and/or hydrocarbon derivatives (1) by means of an extractive distillation using a selective solvent (2) by supplying the selective solvent (2) in the upper column region and supplying the hydrocarbons and/or hydrocarbon derivative (1) mixture to be separated below the supply of the selective solvent (2). In the column (K), the selective solvent (2) is loaded with the mixture (1) components for which the solvent has a higher affinity, and the solvent is discharged from the lower column region as a loaded selective solvent (3), whereas the mixture components for which the selective solvent (2) has a lower affinity remain in the vapor phase and are drawn as a top stream (4), which is completely or partly condensed while obtaining a condensate (5) that is drawn partly as a product stream (6) and otherwise returned to the column (K) as a return stream (7). The invention is characterized in that - a first substantially horizontal inlet pipe (R1) for supplying the selective solvent is provided in the column region above the separative installations (E), - the first substantially horizontal inlet pipe (R1) has a cross-sectional constriction up to a narrowest point (V) and expands again after the cross-sectional constriction, and - a second inlet pipe (R2) is provided which opens into the first substantially horizontal inlet pipe (R1) in the region of the narrowest point of the cross-sectional constriction (V) for supplying the return stream (7).