Evonik Degussa Gmbh

Gunnar Schilling

Markus Winterberg

Reiner Bukohl

Christian Boeing

Dietrich Maschmeyer

Armin Matthias Rix

Dirk Roettger

Holger Wiederhold

Burkard Kreidler

Walter Luh

Christian Böing

Tobias Laiblin

Wolfgang Garstka

Dirk RÖTTGER

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.

Preparation of isobutene by dissociation of MTBE

The present invention describes a process for the parallel selective hydrogenation of branched and unbranched multiply unsaturated C-C-hydrocarbons in olefin-containing hydrocarbon mixtures with minimization of hydrogenation and isomerization of the olefins present in the stream.

Process for the selective hydrogenation of multiply unsaturated hydrocarbons in olefin-containing hydrocarbon mixtures

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Herten, Germany

Gunnar Schilling