Process for reprocessing the bottom product of an extractive distillation for recovering pure hydrocarbons

In this process, the extractive distillation is carried out using as solvents N-substituted morpholines whose substituents contain no more than 7 C atoms. The solvent used in this process is removed from the bottom product of the extractive distillation in a separation column connected downstream of the extractive distillation column. According to the invention, it is intended here that before reintroduction into the extractive distillation column, the solvent drawn off from the bottom of the separation column is introduced into an evaporator which is operated at a pressure p2 which is lower than the pressure p1 in the bottom of the separation column, the vapours emerging from the evaporator being condensed, collected and fed back into the separation column, while the solvent is drawn off from the bottom of the evaporator in the liquid state and reintroduced into the extractive distillation column.