| 摘要 |
The invention relates to a continuous method for the separation of a mixture of hydrocarbons, obtained by extractive distillation of a C 4 fraction (C4) with a selective solvent (LM) and comprising the hydrocarbons from the C4fraction (C4), which are more soluble in the selective solvent (LM) than butane or butene. The mixture is fed to a first distillation column (K I), in which said mixture is separated into a top stream (K I-K), comprising 1,3-butadiene, propyne, optionally further low boilers and optionally water and a bottom stream (K I-S), comprising 1,3-butadiene, 1,2-butadiene, acetylene and optionally further high boilers, whereby the proportion of 1,3-butadiene in the bottom stream (K I-S) of the distillation column (K I) is regulated such as to be at least high enough to dilute the acetylene from that region with a risk of spontaneous decomposition. The top stream (K I - K) from the first distillation column (K I) is fed to a second distillation column (K II) and separated in the second distillation column (K II) into a top stream (K II-K), comprising propyne, optionally further low boilers and optionally water and a bottom stream (K II-S), comprising pure 1,3- butadiene. |
