Process for preparing isobutene from tert-butanol

US7235704B2 · kind B2 · utility

Assignee

• OXENO OLEFINCHEMIE GMBH · DE

Inventors

• Gerda Grund · Coesfeld, DE
• Wilfried Bueschken · Haltern, DE
• Dieter Reusch · Marl, DE
• Andreas Beckmann · Pforzheim, DE

Key dates

• Filing date: Jun 17, 2004
• Grant date: Jun 26, 2007
• Expiry date: Jul 8, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2531/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Isobutene is prepared by dissociating tert-butanol into isobutene and water over an acid ion-exchange resin arranged as a fixed bed in at least one reactor at a temperature of from 80 to 150° C. and at a pressure of from 5 to 25 bar to obtain a reaction mixture, separating the reaction mixture into isobutene, a by-product, water and at least one mixture of undissociated tert-butanol and water. The reactor is operated pseudo-isothermally, with a temperature difference between inflowing and outflowing streams of less than 15 K.