Isolation of 1,3-butadiene from a C4-hydrocarbon mixture

US4277314A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: May 18, 1979
• Grant date: Jul 7, 1981
• Expiry date: May 18, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/05
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for isolating 1,3-butadiene by means of a selective solvent from a C.sub.4 -hydrocarbon mixture which contains 1,3-butadiene, propyne, hydrocarbons which are more soluble than 1,3-butadiene in the selective solvent and hydrocarbons which are less soluble than 1,3-butadiene in the selective solvent, wherein the C.sub.4 -hydrocarbon mixture is separated, using one or more extractive distillation zones, into a distillate containing the less soluble hydrocarbons, a stream of 1,3-butadiene and a stream containing the more soluble hydrocarbons, and the propyne is separated off either by distillation of the C.sub.4 -hydrocarbon mixture in a distillation zone upstream of the extractive distillation zone or zones or by distillation of the stream of 1,3-butadiene, obtained from the extractive distillation zone or zones, in a downstream distillation zone, giving a stream of hydrocarbons containing propyne and 1,3-butadiene, which stream is fed to an additional distillation zone, while at the same time a second stream of liquid or gaseous hydrocarbons is fed to the additional distillation zone, and the bottom product from the additional distillation zone is recycled to the extractive…