Preparation of isobutene by dissociation of MTBE

US8940951B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Markus Winterberg · Waltrop, DE
• Dirk Roettger · Recklinghausen, DE
• Armin Matthias Rix · Marl, DE
• Reiner Bukohl · Marl, DE
• Walter Luh · Marl, DE
• Holger Wiederhold · Darmstadt, DE
• Gunnar Schilling · Herten, DE
• Christian Boeing · Cologne, DE

Key dates

• Filing date: Jun 16, 2010
• Grant date: Jan 27, 2015
• Expiry date: Aug 22, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C1/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing isobutene by dissociation of MTBE, including: a) reaction of isobutene-containing hydrocarbon mixtures, with methanol, present in one or more methanol-containing streams, over acidic ion exchangers to give a stream, containing MTBE and TBA; b) separation of a stream containing MTBE and TBA, from a stream by distillation; c) dissociation of a stream in the gas phase over a heterogeneous catalyst to give a stream containing at least isobutene, methanol, MTBE and water and possibly TBA, d) separation of a stream by distillation to give a stream containing in each case more than 50% by mass of the amounts of methanol, TBA and water present in another stream and a stream containing isobutene, e) separation of water from stream to below 1% by mass by distillation to give a stream, f) total or partial recirculation of the methanol-containing stream.