Isolation of butadiene from a C.sub.4 -hydrocarbon mixture

US4292141A · kind A · utility

Assignee

• BASF SE

Inventors

• Alfred Lindner · Frankenthal (Pfalz), DE
• Klaus Volkamer · Bischofswerda, DE
• Ulrich Wagner · Bernburg, DE
• Dieter Pommer · Bad Dürkheim, DE
• Klaus-Juergen Schneider · Neustadt, DE
• Harald Schwentker · Bad Dürkheim, DE

Key dates

• Filing date: Aug 22, 1979
• Grant date: Sep 29, 1981
• Expiry date: Aug 22, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/005
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for isolating butadiene, with the aid of a selective solvent, from a C.sub.4 -hydrocarbon mixture which contains butadiene and small amounts of styrene and may contain oxygen, hydrocarbons more soluble than butadiene in the selective solvent and hydrocarbons less soluble than butadiene in the selective solvent, in which process the C.sub.4 -hydrocarbon mixture is separated by extractive distillation into a distillate which contains the less soluble hydrocarbons, a stream of butadiene and a stream containing the more soluble hydrocarbons, and in which a mixture of styrene and C.sub.4 -hydrocarbons is removed from the C.sub.4 -hydrocarbon mixture in a distillation zone upstream of the extractive distillation, the top product of the said distillation zone being fed to the extractive distillation.