Oxeno Olefinchemie Gmbh

Evonik Oxeno Gmbh

Evonik Degussa Gmbh

Wilfried Büschken

Robert Franke

Dirk Fridag

Guido Stochniol

Dieter Hess

Dietrich Maschmeyer

Franz Nierlich

Alfred Kaizik

Markus Winterberg

Horst-Werner Zanthoff

Udo Peters

Stephan Houbrechts

Silvia Santiago Fernandez

Walter Luh

Michael Grass

Klaus-Diether Wiese

Axel Tuchlenski

Andreas Beckmann

Armin Matthias Rix

Armin Börner

Gerda Grund

Hans-Gerd Lueken

Wilhelm Droste

Bernhard Scholz

Thomas Quandt

Marc Becker

Dieter Reusch

Stefan Buchholz

Udo Lenz

Dirk Röttger

Jochen Praefke

Jens Holz

Kurt-Alfred Gaudschun

Lothar Kerker

Jörg Sauer

Michael Graβ

Burkhard Reeken

Hans-Gerd Lüken

Hermann-Josef Schulte-Althoff

Georg Skillas

Patrick Muhlack

Walter Tötsch

Frank Höper

Stefan Drees

Stefan Jelko

Norbert Scholz

Dirk Mackowiak

Michael Graß

Oliver MÖLLER

Silvia Santiago-Fernandez

A process for the dissociation of methyl tert-butyl ether (MTBE), which includes at least

Process for the dissociation of MTBE

Isobutene is prepared by dissociation of MTBE in the gas phase, by a) fractional distillation of an MTBE-containing stream comprising feed MTBE (I) and a recycle stream (VIII) to give an MTBE-containing overhead stream (II) and a bottom stream (III) having a boiling point higher than MTBE, b) catalytic dissociation of the overhead stream (II) obtained in step a) to give a dissociation product (IV), c) separation by distillation of the dissociation product (IV) obtained in step b) into an overhead stream (V) comprising more than 90% by mass of isobutene and a bottom stream (VI) comprising diisobutene, MTBE and more than 50% of the methanol present in the dissociation product (IV), d) fractional distillation of the bottom stream obtained in step c) under conditions under which the methanol is obtained as bottom product (VII) and more than 99% of the MTBE is obtained in the overhead product (VIII), and e) recirculation of the overhead product (VIII) to step a).

Isobutene is prepared by a process in which a) an MTBE-containing stream I is separated by distillation into an MTBE-containing overhead stream II and a bottom stream III which comprises compounds having boiling points higher than that of MTBE; and b) the MTBE present in the overhead stream II is dissociated over a catalyst to give a dissociation product IV; wherein the stream I has a proportion of 2-methoxybutane (MSBE) of greater than 1000 ppm by mass, based on MTBE, and wherein the separation by distillation in step a) and/or the dissociation in step b) is carried out so that the dissociation product IV has a concentration of less than 1000 ppm by mass of linear butenes, based on a C-olefin fraction.

The present invention relates to mixtures of alicyclic polycarboxylic esters with high cis content, to a process for their preparation by ring-hydrogenation of the corresponding aromatic polycarboxylic esters, and also to the use of the mixtures.

Mixture of alicyclic polycarboxylic acid esters having high cis isomer content

A reactor, which is capable of accommodating a reaction in which at least three phases are present and at least one gaseous starting material and at least one liquid starting material are reacted in cocurrent over a fixed-bed catalyst to give one or more product(s), contains at least one first zone in which a catalyst is present as a fixed bed; and at least one second zone whose size corresponds to a reactor cross section and which is separated from the at least one first zone by a distributor plate provided with at least one hole and in which at least one liquid and at least one gaseous starting material enter the reactor. The distributor plate is provided with at least one static mixer which is located in the at least one hole on at least one side of the distributor plate.

Apparatus and process for the continuous reaction of a liquid with a gas over a solid catalyst

A hydrogenation catalyst is used for the catalytic hydrogenation of an ester-containing aldehyde mixture and the catalyst contains a &#x3b3;-alumina having a BET surface area of from 70 to 350 m/g as support material, and at least one component having hydrogenation activity and being selected from the group consisting of nickel, cobalt and mixtures thereof.

Process for the hydrogenation of oxo aldehydes having high ester contents

A method for the continuous preparation of an alicyclic carboxylic acid or an ester of the alicyclic carboxylic acid. A plastic which incorporates the alicyclic carboxylic acid or an ester of the alicyclic carboxylic acid. An article made of a plastic which incorporates the alicyclic carboxylic acid or an ester of the alicyclic carboxylic acid. A liquid which incorporates the alicycic carboxylic acid or an ester of the alicyclic carboxylic acid.

Method for preparing alicyclic carboxylic acids and their esters

A process for preparing low-water ethanol from at least two streams of relatively water-rich ethanol that have a different water content by dewatering at membranes. The low-water ethanol can be used to prepare ethyl tert-butyl ether (ETBE).

Process for dewatering ethanol

Isobutene in isobutenic hydrocarbon mixtures is oligomerized over a solid acidic ion exchange resin, said acidic ion exchange resin containing, for example, sulfonic acid groups, some of whose protons have been exchanged for metal ions.

Oligomerization of isobutene in N-butenic hydrocarbon streams

The present invention relates to a process for preparing a C-alcohol mixture which is suitable, in particular, as precursor for the preparation of compounds having surfactant properties and of plasticizers.

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The invention relates to a process for preparing high-purity diisobutene by reaction of isobutene or isobutene-containing hydrocarbon mixtures over a solid acidic ion-exchange resin containing sulfonic acid groups whose protons have been partly replaced by metal ions and to the use of the diisobutene.

Method for preparing high-purity diisobutene

The present invention relates to a process for preparing tert-butanol (TBA) by reacting an isobutene-containing hydrocarbon mixture with water over a solid acid catalyst in a reactor cascade, wherein at least one reactor is supplied alternately with two different isobutene-containing hydrocarbon mixtures, of which one has both a higher tert-butanol content and a higher water content than the other mixture.

Process for preparing tert-butanol from isobutene-containing hydrocarbon mixtures

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Haltern am See, Germany

Wilfried Büschken