| abstract |
A process for the extraction of crude 1,3-butadiene by extractive distillation from a C¶4¶ cut with a selective solvent in a dividing wall column (TC) is proposed, in which a dividing wall (T) in the longitudinal direction of the column with formation of a first section (A), a second section (B) and a lower common column area (C) and which is preceded by an extractive washing column (K). |