Rohm Gmbh

Evonik Operations Gmbh

Evonik Roehm Gmbh

Roehm Gmbh

Evonik Rohm Gmbh

Evonik Degussa Gmbh

Roehm Gmbh & Co Kg

Steffen Krill

Alexander Lygin

Matthias Groemping

Rudolf Burghardt

Marcel Treskow

Torsten Balduf

Belaid Ait Aissa

Florian Zschunke

Thorben Schütz

Martin Koestner

Andreas Tepperis

Alexander May

Daniel Helmut König

Andreas Rühling

Gerhard Kölbl

Matthias Grömping

Patrik Hartmann

Gerhard Koelbl

Marita Kaufmann

Andrea Wittkowski

Maik Caspari

Johannes Vorholz

Doris Saal

Silvia Beyer

Andreas Weber

Rüdiger Carloff

Udo Gropp

Thomas Müller

Martin Steurenthaler

Florian Klasovsky

Martin Körfer

Kathrin Salwiczek

Ralf Richter

Marcus Denger

Norbert Hoffmann

Eduard Rundal

Günther Gräff

Joerg Becker

Martin Steffan

Alexander Richter

Frederik Gluth

Willi Ploesser

Michael Schnabel

Torsten Panak

Diego Carambia

Gabriel Avella

Dirk Bröll

Wolfgang Luley

Martin Glock

David Bailey

Maren Kuhn

Thorben Schutz

Reed Zhao

Friedel Schultheis

Milica Lukic

Tim Bleith

Steffen Finger

Markus Maier

Jalyn Deng

Olaf Merker

Andreas Gräff

Mounir Stitou

Melanie Raczek

Christine Weiß

Lukas Friedrich Dössel

Torsten Krüger

Jörg Becker

Christine Weiss

Stefan Prosch

Patrick Peter

Timm Schumann

Patrick Wings

Martin KÖSTNER

Isabelle Klein

Nikolaos Papadopoulos

Willi PLÖSSER

Ufuk Kockesen

The invention relates to a process for distillative removal of a unsaturated carboxylic anhydride of the general formula (I) R—C(O)—O—C—(O)—R in which R is an unsaturated organic radical having 2 to 12 carbon atoms, wherein said unsaturated carboxylic anhydride is discharged in gaseous form from a sidestream take-off and is condensed in an atomized liquid circulating stream of said unsaturated carboxylic anhydride.

Process for distillative purification of unsaturated carboxylic anhydrides

The present invention is to storage-stable compositions containing glycerol (meth)acrylate carboxylic esters, carboxylic acids and, optionally, Broensted acids.

Glycerol (meth)acrylate carboxylic ester having a long shelf life

A process prepares glycerol carbonate (meth)acrylate by transesterification of methyl (meth)acrylate with glycerol carbonate, in the presence of a zirconium acetylacetonate catalyst. The catalyst is pretreated with 2% by weight to 25% by weight of water, based on the amount of catalyst.

Process for preparing glycerol carbonate (meth)acrylate

A process can be used for preparing methyl methacrylate by direct oxidative esterification of methacrolein. Methyl methacrylate is used in large amounts for preparing polymers and copolymers with other polymerizable compounds. In addition, methyl methacrylate is an important synthesis unit for a variety of specialty esters based on methacrylic acid (MAA) which can be prepared by transesterification with the appropriate alcohol. There is consequently a great interest in very simple, economic and environmentally friendly processes for preparing this starting material. A corresponding optimized workup of the reactor output from the oxidative esterification of methacrolein, through which unconverted methacrolein (MAL) can be recycled very efficiently, is useful. In addition, the process can be carried out in a manner which compared to known variants is markedly more energy- and water-saving.

Simplified workup of the reactor output from an oxidative esterification

A mixture contains at least one polyether block amide (PEBA) and at least one poly(meth)acrylate, selected from poly(meth)acrylimides, poly-alkyl(meth)acrylates, and mixtures thereof. The mass ratio of PEBA to poly(meth)acrylate is 95:5 to 60:40. The polyalkyl(meth)acrylate contains 80% by weight to 99% by weight of methyl methacrylate (MMA) units and 1% by weight to 20% by weight of C1-C10-alkyl acrylate units, based on the total weight of polyalkyl(meth)acrylate. The mixture can be processed to give foamed mouldings. The mouldings can be used in footwear soles, stud material, insulation or insulating material, damping components, lightweight components, or in a sandwich structure.

Polyether block amide-poly(meth)acrylate foams

A process can be used for preparing methyl methacrylate (MMA), by direct oxidative esterification of methacrolein. The MMA and polymers produced therefrom feature a very low yellowness index. A workup of the reactor output from the oxidative esterification of methacrolein allows for particularly discolouring by-products to be removed or degraded without significant MMA losses.

Process for eliminating interfering by-products in the direct oxidative esterification of methacrolein

The invention relates to a method for preparation of (meth)acrylic acid esters from (meth)acrylic acid anhydrides. Wherein the method for preparation of the (meth)acrylic acid ester, comprises at least step (a) as follows: (a) reacting a (meth)acrylic acid anhydride of Formula (I): wherein Ris a hydrogen atom or a methyl group; with a substrate in the presence of a first catalyst to form a product mixture comprising the (meth)acrylic acid ester; and wherein:

Preparation of (meth)acrylic acid esters

A process for producing alkyl methacrylates, in particular methyl methacrylate (MMA), includes production of methacrolein (MAL) in a first reaction stage; direct oxidative esterification (DOE) of the methacrolein with an alcohol, preferably methanol, to afford an alkyl methacrylate in a second reaction stage; and workup of the alkyl methacrylate crude product from the second reaction stage. An optimized workup of the reactor output from the oxidative esterification of methacrolein involves minimizing the amount of employed water, the amount of employed acid, and/or the amount of aqueous waste streams, through an optimized recycling of the generated process water streams.

Process for producing alkyl methacrylates with improved water and acid management

Methacrolein is prepared in a continuous process by a Mannich condensation reaction of formaldehyde with propanal. A methacrolein polymerization inhibitor is introduced during the production process and a part thereof is recycled back into the reactor where the Mannich condensation reaction is carried out.

Continuous process for preparing methacrolein

The invention relates to a method for preparing C—H acidic (meth)acrylates and the uses thereof.

Method for preparing C-H acidic (meth)acrylates

A process can be used for producing methacrylic acid or a methacrylic acid ester. The process involves producing acrolein, reacting the produced acrolein with hydrogen to produce propanal, reacting the propanal with formaldehyde to produce methacrolein, and oxidizing the methacrolein in the presence of an oxygen containing gas and optionally an alcohol, to obtain methacrylic acid or methacrylic acid ester.

Process for producing methacrylic acid or methacrylic acid esters

The invention relates to a method for preparation of (meth)acrylic acid esters from (meth)acrylic acid anhydrides. The method involves: reacting a (meth)acrylic acid anhydride of Formula (I):

A process for producing methacrylic acid or a methacrylic acid ester including, producing acrolein, reacting the produced acrolein with hydrogen to produce propanal, reacting the propanal with formaldehyde to produce methacrolein, and oxidizing the methacrolein in the presence of an oxygen containing gas and optionally an alcohol, to methacrylic acid or a methacrylic acid ester.

A novel process can be used for a heterogeneously catalysed oxidation reaction, in the presence of a pulverulent noble metal-containing catalyst, where (meth)acrolein, an alkyl alcohol, in particular methanol, and an oxygen-containing gas are converted to an alkyl (meth)acrylate, in particular methyl (meth)acrylate. A corresponding reactor suitable for performing the reaction is also useful. The process allows for an effective retention of the particulate catalyst and the continuous discharge of fines fractions of the catalyst powder which are present, particularly in a fresh catalyst batch as a consequence of its preparation. Such fines fractions may also be produced by abrasion during the reaction. The process allows for effective recycling, recovery, and utilization of these discharged catalyst fractions.

Reactor and process for producing alkyl (meth)acrylates

A process can be used for producing optical molding materials on the basis of methyl methacrylate (MMA). The MMA produced by an optimized method and the molding materials feature in particular a very low yellowness index. This MMA has been produced by direct oxidative esterification of methacrolein. An optimized workup of the reactor output from the oxidative esterification of methacrolein can be used for removing particularly discoloring byproducts. This process moreover has the advantage that fewer demands are placed on plant apparatus configuration.

Process for producing optical molding materials

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Muehltal, Germany

Steffen Krill