| 摘要 |
The invention relates to a method for obtaining crude 1,3-butadiene from a C4 fraction, by means of extractive distillation, using a selective solvent in a partition column (TK) in which a partition (T) is arranged in the longitudinal direction of the column, forming a first partial region (A), a second partial region (B) and a lower common column region (C), an extractive wash column (K) being arranged upstream of said partition column. The operation of the partition column (TK) is adjusted by regulating the energy input thereinto (TK) using a bottom evaporator (V) and by means of the arrangement of the number of theoretical separating stages in the lower common column region (C), in such a way that a bottom flow (17) consisting of a purified solvent can be obtained from the partition column (TK).
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