Method for obtaining aromatic hydrocarbons from a hydrocarbon mixture

The invention relates to a method for obtaining aromatic hydrocarbons, selected from benzene, toluol, xyIoI and ethyl benzene or mixtures thereof, from a mixture of hydrocarbons, which in addition contains non-aromatic hydrocarbons and high-boiling components. The method comprises the steps: (A) preparation of a mixture of hydrocarbons a1 and an extractive solvent using a2 from N-formylmorpholine, (B) extractive distillation of the hydrocarbon mixture a1 using the extractive solvent to obtain a mixture b1 containing extractive solvent and the aromatic hydrocarbons, said mixture containing high-boiling components and a mixture b2 containing non-aromatic hydrocarbons, (C) distillation of the mixture b1 of extractive solvent and the aromatic hydrocarbons obtained in step (B), to obtain one or more fractions c1 of aromatic hydrocarbons and the extractive solvent c2 containing high-boiling components, (D) separation of a partial stream d1 from the extractive solvent c2 and return of the extractive solvent c2 to th