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 1145288

ABSTRACT OF THE DISCLOSURE: A process for isolating a conjugated diolefin from a C4- or C5-hydrocarbon mixture containing 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 75 to 98 per cent by weight of an N-alkylsubstituted lower aliphatic acid amide or of an N-alkylsubstituted alicyclic acid amide having 5 ring members, boiling at from 140 to 260°C, or butyrolactone or methoxypropionitrile and b) from 2 to 25 per cent by weight of acetonitrile.

347043

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