Process for the separation of paraffinic and olefinic C4-hydrocarbons

摘要

In this process, the hydrocarbons of the starting product are separated by extractive distillation, the olefins being removed together with the majority of the solvent from the bottom and the paraffins via the head of the extractive distillation column. According to the invention, it is proposed in this connection that the solvent residues contained in the paraffins are removed from the paraffins in a column still head arranged above the solvent feed tray of the extractive distillation column.