Evonik Degussa Gmbh

Christian Boeing

Markus Winterberg

Reiner Bukohl

Dietrich Maschmeyer

Dirk Roettger

Armin Matthias Rix

Gunnar Schilling

Peter Wasserscheid

Horst-Werner Zanthoff

Thomas Quandt

Holger Wiederhold

Burkard Kreidler

Stefan Buchholz

Christian Schulze Isfort

Walter Luh

Berthold Melcher

Marco Haumann

Tobias Laiblin

Wolfgang Garstka

The invention provides a catalyst system composed of: Additionally provided is the use of the catalyst systems of the invention in the oligomerization of unsaturated hydrocarbon mixtures.

Process for oligomerizing olefins

Silicon-aluminum mixed oxide powder having a weight ratio of (AlO/SiO)in the total primary particle of from 0.003 to 0.05, a weight ratio (AlO/SiO)of the primary particles in a surface layer having a thickness of about 5 nm which is less than in the total primary particle and a BET surface area of from 50 to 250 m/g. It is prepared by igniting one or more silicon compounds selected from the group consisting of CHSiCl, (CH)SiCl, (CH)SiCl and (n-CH)SiCl, a hydrolysable and oxidizable aluminum compound, at least one fuel gas and air and burning the flame into a reaction chamber, subsequently separating the solid from gaseous materials and subsequently treating the solid with water vapor. The silicon-aluminum mixed oxide powder can be used as catalyst.

Silicon-aluminum mixed oxide powder

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 invention relates to a process for regenerating catalysts containing mixed oxides from the group of alkali metal and/or alkaline earth metal oxides, aluminium oxide and silicon oxide, characterized in that the regeneration comprises the following features:

Process for regenerating a catalyst

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

The present invention relates to a process for efficient purification of MTBE-containing mixtures and for preparation of isobutene by cracking of MTBE-containing mixtures.

Method for purification of mixtures comprising MTBE as well as production of isobutene by splitting of mixtures comprising MTBE

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Cologne, Germany

Christian Boeing