Isolation of a conjugated diolefin from a c.sub.4- or...

Details Isolation of a conjugated diolefin from a c.sub.4- or... Isolation of a conjugated diolefin from a c.sub.4- or...

C - Chemistry, Metallurgy

07

C

202/78

C07C 7/08 (2006.01)

Patent

CA 1145289

Abstract of the disclosure: A process for isolating a con- jugated diolefin from a C4- or C5-hydrocarbon mixture con- taining the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solvent mixture which comprises (a) from 50 to 98 percent by weight of an N-alkyl-substituted lower aliphatic acid amide or of an N-alkyl-substituted alicyclic acid amide having 5 ring members and (b) from 2 to 50 percent by weight of an aliphatic ether boiling at from 30°C to 200° of the general formula R-O-R', where the aliphatic radical R is a hydrocarbon radical of 1 to 6 carbon atoms and the aliphatic radical R' is a hydro- carbon radical of 2 to 6 carbon atoms, or a dialkyl ether of a dihydric alcohol boiling at from 30°C to 200°C, of the general formula R1-[OCH2-CHR-]nOR2, where R is hydrogen or CH3, R1 and R2 are each a hydrocarbon radical of 1 to 5 carbon atoms, and n is an integer from 1 to 3, or an ali- cyclic ether boiling at from 50°C to 125°C.

347097

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