Recovery of isoprene from a C.sub.5 -hydrocarbon mixture

US4647344A · kind A · utility

Assignee

• BASF SE

Inventors

• Alfred Lindner · Frankenthal (Pfalz), DE
• Ulrich Wagner · Bernburg, DE
• Klaus Volkamer · Bischofswerda, DE
• Walter Rebafka · Eppelheim, DE

Key dates

• Filing date: Oct 19, 1984
• Grant date: Mar 3, 1987
• Expiry date: Oct 19, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Isoprene is recovered from a C.sub.5 -hydrocarbon mixture containing isoprene, penta-1,3-diene and cyclopentadiene by separating the said mixture by liquid-liquid extraction or extractive distillation with the aid of a selective solvent, in combination with a distillation upstream or downstream from the liquid-liquid extraction or extractive distillation, by a method in which a stream containing penta-1,3-diene and cyclopentadiene is separated off in the upstream or downstream distillation and is catalytically hydrogenated, and the hydrogenated stream is fed to the upper part of the liquid-liquid extraction or extractive distillation.