Evonik Degussa Gmbh

Evonik Stockhausen Gmbh

Oxeno Olefinchemie Gmbh

Jörg Sauer

Guido Stochniol

Franz-Felix Kuppinger

Andreas Sabbagh

Markus Winterberg

Jürgen Mosler

Franck Furno

Günther Bub

Nicole Brausch

Udo Knippenberg

Jörg Leistner

Günter Latoschinski

Thorsten Schwärtzke

Dietrich Maschmeyer

Klaus-Diether Wiese

Horst-Werner Zanthoff

Wilfried Büschken

Martin Trocha

Dorit Wolf

Stefan Nordhoff

Stefan Bade

Harald Stüger

Silvia Santiago Fernandez

Norbert Schladerbeck

Bernhard Stützel

Beate Seliger

Yücel Önal

Oliver Becker

Markus Weber

Dennis Fruhling

Michael Bernd Fricke

Dr Jörg Leistner

Dennis FRÜHLING

The present invention relates to a process for preparing unsaturated aldehydes or unsaturated carboxylic acids by heterogeneous catalytic gas phase oxidation of unsaturated or saturated hydrocarbons, comprising the process steps of: i) providing a gas mixture comprising a saturated hydrocarbon and catalytically dehydrogenating the saturated hydrocarbon in the gas phase to obtain a gas mixture comprising an unsaturated hydrocarbon in a dehydrogenation reactor having a dehydrogenation catalyst material; or ii) providing a gas mixture comprising oxygen and an unsaturated hydrocarbon; iii) catalytically oxidizing the unsaturated hydrocarbon obtained in process step i) or provided in process step ii) in the gas phase to obtain a gas mixture comprising an unsaturated aldehyde in a first oxidation reactor having a first oxidation catalyst material; wherein at least one of the reactors selected from the dehydrogenation reactor, the first oxidation reactor and the second oxidation reactor comprises at least one foam body.

Use of foam bodies in oxidation reactors for preparing unsaturated aldehydes or carboxylic acids

Process for preparing higher hydridosilanes of the general formula H&#x2014;(SiH)&#x2014;H where n&#x2267;2, in which&#x2014;one or more lower hydridosilanes&#x2014;hydrogen, and&#x2014;one or more transition metal compounds comprising elements of transition group VIII of the Periodic Table and the lanthanides are reacted at a pressure of more than 5 bar absolute, subsequently depressurized and the higher hydridosilanes are separated off from the reaction mixture obtained.

Process for preparing higher hydridosilanes

The present invention relates to superabsorbent polymer comprising acrylic acid made by the process comprising the steps of heating an aqueous glycerine solution to form glycerine; transporting the glycerine to the dehydration reactor; dehydrating the glycerine to an acrolein-comprising dehydration product; gas phase oxidating of the acrolein-comprising dehydration product to obtain an acrylic acid-comprising monomer gas; bringing into contact of the monomer gas with a quench agent to obtain an acrylic acid-comprising quench phase; working-up the quench phase to obtain an acrylic acid-comprising monomer phase; and polymerizing the acrylic acid-comprising monomer phase; wherein a plurality of gas bubbles is generated and wherein the dehydration occurs at least partially in the liquid phase. The superabsorbent polymer has certain properties for biodegradability and sustainability. Further, at least about 25% of the acrylic acid is based on glycerine. The superabsorbent polymer has a sustainability factor of at least about 80%.

Water-absorbing polymer structures based on renewable raw materials and process for their production by dehydration

The present invention relates to a process for production of acrylic acid, comprising the steps of a) dehydration of glycerine to an acrolein-comprising dehydration product; b) gas phase oxidation of the dehydration product to obtain an acrylic acid-comprising monomer gas; c) bringing into contact of the monomer gas with a quench agent to obtain an acrylic acid-comprising quench phase; and d) work-up of the quench phase to obtain an acrylic acid-comprising monomer phase; whereby, during the dehydration a liquid phase a1 and a gas phase a2 is present, whereby in the liquid phase a1 a plurality of gas bubbles is generated, as well as a process for production of polymers by polymerization of acrylic acid, preferably for production of water-absorbing polymers, the water-absorbing polymers obtainable by this process, a composite, a process for production of a composite, the composite obtainable by this process, and further chemical products.

Acrylic acid and water-absorbing polymer structures based on renewable raw materials and process for their production by dehydration

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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Dülmen, Germany

Jörg Sauer