Evonik Stockhausen Gmbh

Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Evonik Operations Gmbh

Stefan Nordhoff

Torsten Balduf

Robert Franke

Dirk Fridag

Martin Roos

Uwe Numrich

Horst-Werner Zanthoff

Franz-Felix Kuppinger

Axel Hengstermann

Jürgen Mosler

Franck Furno

Günther Bub

Axel Kobus

Stefan Gross

Roland Fornika

Rudolf M Wagner

Guenther Bub

Bart Hamers

Peter Denkinger

Julia Strautmann

Udo Knippenberg

Joachim Pohlisch

Jörg Sauer

Matthias Creutz

Hans-Rolf Lausch

Arndt Selbach

Jürgen Kohn

J&uuml;rgen Glenneberg

Günter Latoschinski

Dennis Thong Yu-Chiang

Niko Haberkorn

Wilfried Uhlich

Matthias Blug

Dennis Thong

Joachim Deinken

Dieter M&ouml;ller

Thomas Rathke

Michael Bernd Fricke

Rudolf Wagner

Stephan Gross

The present invention relates to the use of epoxy-terminated polydiene having terminal epoxy groups as oxygen scavenger, in particular as constituent in packaging.

Epoxy-terminated polybutadiene as oxygen scavenger

Provided is a process for producing an aldehyde from an alkylene. The process includes (a) photocatalytically dehydrogenating at least one alkane to obtain a mixture comprising at least one olefin and hydrogen, (b) adding carbon dioxide and hydrogen to the mixture, and (c) hydroformylating the olefin to at least one aldehyde. The process also includes converting carbon dioxide and hydrogen into water and carbon monoxide prior to the hydroformylating. In addition, the conversion of carbon dioxide and hydrogen into water and carbon monoxide is performed by a reverse water gas shift reaction.

Energy efficient synthesis of aliphatic aldehydes from alkenes and carbon dioxide

The invention relates to a washing apparatus, including a First Region () to which a wash material () is supplied, a Second Region (), in which the wash material () is washed, and a Third Region (), in which the wash material () is melted and a flow resistance (), which is provided between the Second Region () and the Third Region (), a purification apparatus, a synthesis device, a method for purifying a wash material, and the use of a washing apparatus or a purification apparatus for purifying and then using the target product obtained by the purification.

Washing apparatus, a method of purifying a wash material and use of the washing apparatus

The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.

Superabsorbent polymer made from acrylic acid

The invention relates to a process for the purification of (meth)acrylic acid in a process stage that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The process according to the invention, the apparatus suitable for implementing the process, and the use of the apparatus according to the invention for the production of (meth)acrylic acid are characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement.

Continuous process for the production and purification of acrylic acid

The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.

(Meth)acrylic acid crystal and process for producing aqueous (meth)acrylic acid

The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.

Method for the purification of (meth)acrylic acid

The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable by this process, fibers, formed bodies, films, foams, superabsorbent polymers and other special polymers based on or containing this acidic monomer, the use of this acidic monomer in or for producing fibers, formed bodies, films, foams, superabsorbent polymers or other special polymers.

Purification of a monomer by extraction with a phase former and crystallization

A process for the continuous preparation of very highly concentrated hydrogen peroxide having a content of greater than 80 wt.%, especially over 98 wt.%, by suspension crystallization and after-treatment of the H O crystals. The after-treatment takes the form of countercurrent washing in a hydraulic or mechanical washing column with a packed crystal bed. Hydrogen peroxide is disclosed having a concentration of from 99.9 to 100 wt.% and a content of TOC, nitrate, phosphate, nickel and tin of in each case less than 4 mg/l.

Crystallization process for producing highly concentrated hydrogen peroxide

A process for the concentration of aqueous hydrogen peroxide by discontinuous crystallization. A cooling surface is arranged in a crystallizing vessel and first wetted with hydrogen peroxide and then cooled at a high cooling rate, whereupon seed crystals form. The cooling rate is at least 1 K/s, preferably from 10 to 30 K/s. When the vessel has been filled with H O starting material, the latter crystallizes, starting from the seed crystals, and forms a crystal layer. When the mother liquor of lower H O concentration has been discharged, there follows a sweating operation with a slow increase in temperature, as a result of which the H O concentration in the crystal layer is increased further.

Process for the concentration of aqueous hydrogen peroxide by crystallization

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Recklinghausen, Germany

Stefan Nordhoff