Isolation of a conjugated diolefin from a C.sub.4 - or C.sub.5 -hydrocarbon mixture

US4277315A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Volkamer · Bischofswerda, DE
• Klaus Broellos · Seeheim-Jugenheim, DE
• Alfred Lindner · Frankenthal (Pfalz), DE
• Ulrich Wagner · Bernburg, DE
• Hans-Martin Weitz · Bad Dürkheim, DE
• Klaus-Juergen Schneider · Neustadt, DE

Key dates

• Filing date: Mar 3, 1980
• Grant date: Jul 7, 1981
• Expiry date: Mar 3, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for isolating a conjugated diolefin from a C.sub.4 - or C.sub.5 -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 PA0 (a) from 1 to 99 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 PA0 (b) from 1 to 99 percent by weight of an lower aliphatic carboxylic acid ester or carbonic acid ester boiling at from 30.degree. C. to 200.degree. C.