| 摘要 |
A method for separation of a crude C4 cut, containing butane, butene, 1,3- butadiene and small amounts of other hydrocarbons, amongst which are C4 acetylenes, by means of extractive distillation with a selective solvent is disclosed, whereby the crude C4 cut (1) is introduced into a first extractiv e distillation column (K I) in the mid region thereof, the selective solvent ( 2) introduced above the crude C4 cut (1) and a vapour sidestream (3) withdrawn from the first extractive distillation column below the introduction point o f the crude C4 cut (1), containing the C4 acetylenes and predominantly the selective solvent as well, whereby the concentration of the C4 acetylenes in the vapour sidestream (3) lies below the spontaneous decomposition level and a head stream (5) is withdrawn containing the components which are less solubl e then the C4 acetylenes in the selective solvent.
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