| 摘要 |
The invention relates to a method for obtaining crude 1,3-butadiene from a C 4 fraction, by means of extractive distillation, using a selective solvent in a partition column (TK) in which a partition (T) is arranged in the longitudin al direction of the column, forming a first partial region (A), a second partia l 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 b e obtained from the partition column (TK).
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