Separation of c.sub.4-hydrocarbon mixture by extractive...

Details Separation of c.sub.4-hydrocarbon mixture by extractive... Separation of c.sub.4-hydrocarbon mixture by extractive...

C - Chemistry, Metallurgy

07

C

202/76

C07C 7/08 (2006.01)

Patent

CA 1220757

- 13 - Abstract of the Disclosure: A C4-hydrocarbon mixture which contains hydrocarbons which are more readily soluble in the selective solvent and those which are more sparingly soluble in the said solvent is separated with the aid of a selective solvent by a process in which the C4-hydrocarbon mixture is separated, in an extractive distillation zone, into a top product (distillate), which contains the more sparingly soluble hydrocarbons, and an extract containing the more readily soluble hydrocarbons and the selective solvent, the extract taken off as the bottom product is fed to a solvent recovery zone, in which the extract is separated into a product containing the hydrocarbons, and the selec- tive solvent which has been partially or completely freed from the hydrocarbons, and the concentration, based on the C4-hydrocarbon/selective solvent mixture formed in the extractive distillation zone, of the selective sol- vent in the said zone falls below 75% by weight on one or more trays or, in the case of packed extractive dis- tillation columns, at one or more points within the packing.

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