Isolation of isobutene from C.sub.4 -hydrocarbon mixtures containing isobutene

US4448643A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Jul 13, 1981
• Grant date: May 15, 1984
• Expiry date: Jul 13, 2001

Classification

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

Abstract

A process for isolating isobutene from C.sub.4 -hydrocarbon mixtures containing isobutene by reacting the mixture with a primary alcohol in the presence of an acid condensing agent, to form the tertiary ether, separating off the unconverted hydrocarbons and decomposing the tertiary ether in the presence of an acid catalyst at an elevated temperature, wherein a primary C.sub.3 - or C.sub.4 -alcohol is used and the temperature at which the reaction mixture leaves the etherification stage, in which the tertiary ether is formed, is lower than the mean temperature in the etherification stage.