Method for separating a hydrocarbon mixture, separating plant and steam cracking plant

The invention relates to a method for separating a hydrocarbon mixture (C) obtained at least partially by means of steam cracking (10), which hydrocarbon mixture contains at least hydrocarbons having one, two, and three carbon atoms, among them ethane and ethylene, wherein first a first fraction (C2+, C2-) is extracted from the hydrocarbon mixture (C), wherein other components are at least partially removed, which first fraction contains the majority of the hydrocarbons having two and more carbon atoms previously contained in the hydrocarbon mixture (C) or the majority of the hydrocarbons having two and less carbon atoms previously contained in the hydrocarbon mixture (C), wherein further fractions (C1, C2, C2H4, C3+, C2H6) are then extracted from the first fraction (C2+, C2-). In parallel with or after the at least partial removal of the other components from the hydrocarbon mixture (C), a fraction (R, S) containing ethane is removed in an amount that reduces the ethane content in the first fraction (C2+, C2-) to less than 25%, wherein the fraction (R, 2) containing ethane is low in or free from other hydrocarbons having two carbon atoms. The invention further relates to a separating plant (30), to a corresponding steam cracking plant, and to a method for converting a steam cracking plant.