METHOD OF OBTAINING UNREFINED 1, 3-BUTADIENE Russian patent published in 2008 - IPC C07C7/08 C07C11/167 

FIELD: chemistry.

SUBSTANCE: described is the method of obtaining unrefined 1, 3-butadiene with the help of extractive distillation from C₄-fractions, which contain C₄-acetylenes as the secondary components, with the use of a selective solvent. The method is achieved in a column with dividing partitions, which contains in the bottom part an evaporator, in which lengthwise there is a dividing partition, which forms the first zone, the second zone and the underlying combined zone of the column, connected along the upper flow with the extractive washing column. Supply of energy to the column with the dividing partition through the lower evaporator is regulated such that from the column with the dividing partition draw off the lower stream, which contains the solvent, saturated with C₄-acetylenes, in which the portion of 1, 3-butadiene is limited with the estimation that the 1, 3-butadiene lost is economically acceptable. In this case the lower stream is submitted into the decontaminator for acetylenes, from which C₄-acetylenes are removed and the purified solvent is removed from it from the lower stream.

EFFECT: increase in the periods of the operation of the device between the cleaning cycles.

11 cl, 1 tbl, 1dwg, 1ex