| abstract |
In a process for the work-up of a C4 fraction, comprising the process steps n Extractive distillation (I), n Selective hydrogenation over a heterogeneous catalyst (II), a crude 1,3-butadiene stream being obtained following process steps (I) and (II) and n Distillation of the crude 1,3-butadiene stream for isolating pure 1,3-butadiene (III), n the process steps I and II are carried out in a single column or in thermally coupled columns and the process step III is carried out in a second column. |