Evonik Roehm Gmbh

Evonik Stockhausen Gmbh

Evonik Rohm Gmbh

Degussa Aktiengesellschaft

Rohm Gmbh

Degussa - Huls Ag

Evonik Degussa Gmbh

Evonk Röhm Gmbh

Torsten Balduf

Steffen Krill

Rudolf Burghardt

Alexander Lygin

Matthias Groemping

Stefan Nordhoff

Axel Kobus

Martin Koestner

Arndt Selbach

Jürgen Mosler

Andreas Sabbagh

Gerhard Koelbl

Jürgen Kohn

Roland Fornika

Georg Markowz

Birgit Bertsch-Frank

Günther Bub

Ina Hemme

Joachim Pohlisch

Stefan Gross

Guenther Bub

Hans-Rolf Lausch

Werner Wildner

Dennis Thong Yu-Chiang

Wolfgang Lortz

Martin Roos

Stefan Wieland

Georg Thiele

Steffen Hasenzahl

Axel Hengstermann

Rudiger Schutte

Andreas Tepperis

Thomas Gobel

Horst Grethe

Rüdiger Schütte

Gerhard Kölbl

Matthias Grömping

Eduard Rundal

Patrick Peter

Catrin Becker-Balfanz

R&uuml;diger Sch&uuml;tte

Frederik Gluth

Jürgen Rollmann

Wilfried Uhlich

Henning Schaefer

Catrin Becker

Reed Zhao

Peter Esser

Dennis Thong

Melanie Raczek

Jurgen Rollmann

Thomas Rathke

Joachim Deinken

Martin KÖSTNER

Stephan Gross

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 present invention relates to a process for producing methyl methacrylate, comprising the following steps: A) producing methacrolein and B) reacting the methacrolein obtained in step A) in an oxidative esterification reaction to give methyl methacrylate, characterized in that the two steps A) and B) take place in a liquid phase at a pressure of from 2 to 100 bar, and step B) is carried out in the presence of a heterogeneous noble-metal-containing catalyst comprising metals and/or comprising metal oxides.

Method for producing methylmethacrylate

The present invention relates to a process for producing methyl methacrylate, comprising the following steps:

The present invention relates to an optimized process for preparing methacrylic acid, wherein methacrolein is prepared in a first stage from propionaldehyde and formaldehyde by means of a Mannich reaction and oxidized in a second stage to methacrylic acid. More particularly, the present invention relates to the reduction in the amounts of catalyst to be used in the first stage, especially to the reduction in the amounts of acid to be used here, by virtue of the additional installation of recycling streams suitable for the purpose.

Optimized process for preparing methacrylic acid

The present invention relates to an optimized process for the preparation of methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for the preparation of methacrylic acid, methyl methacrylate or even active ingredients, fragrances or flavorings. In particular the present invention relates to the optimization of the process parameters by which, inter alia, a reduction of the content of harmful dimeric methacrolein in the end product may be achieved.

Optimized method for producing methacrolein

The present invention relates to a catalytic continuous process for producing methyl methacrylate, said process comprising the step of reacting methacrolein with oxygen and methanol in the presence of a heterogeneous noble-metal-containing catalyst in an oxidative esterification reaction to give methyl methacrylate, characterized in that the stationary concentration of the starting material methacrolein is equal to or less than 12% by weight based on the total weight of the reaction mixture in the reactor, and the ratio F between the total liquid volume within the reactor expressed in liters divided by the total weight of catalyst in the reactor expressed in kilograms is equal to or less than 4.

Process for producing methyl methacrylate

The present invention relates to the oxidative combustion of amine-containing wastewaters, especially in a process for preparing methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for preparation of methacrylic acid, methyl methacrylate, or else of active ingredients, odorants or flavorings. More particularly, the present invention relates to an oxidative combustion of the amine-containing wastewaters with only low nitrogen oxide formation.

Recirculation and disposal of aqueous catalyst solutions in amine catalytic processes

The invention relates to a process for preparation of at least one of methacrylic acid and a methacrylic acid ester, comprising the process stepsgas phase oxidation of at least one Ccompound, quenching of the reaction phase, separation and purification of the obtained methacrylic acid and optionally esterification, wherein the Ccompound is a methacrolein comprising mixture, originating from at least two different methacrolein sources, a first methacrolein source being a feed stream obtained by the heterogeneously catalyzed gas phase oxidation of isobutylene or tert-butyl alcohol or isobutylaldehyde or a mixture of two or more thereof, a second methacrolein source being a feed stream obtained by the reaction of propionaldehyde with a Cextending agent, preferably formaldehyde, and where said methacrolein can be obtained either completely from the first methacrolein source, or completely from the second methacrolein source or from any mixture of both.

Process for preparation of methacrylic acid and methacrylic acid esters

The present invention relates to a process for preparing methyl methacrylate by a direct oxidative esterification of methacrolein with oxygen and methanol, which is conducted in the liquid phase at a pressure of 2 to 100 bar with a gold catalyst. According to the invention, the liquid phase is withdrawn continuously from the reactor and optionally enriched with oxygenous gas, the pH, after the withdrawal, is adjusted to a pH between 5 and 9 by means of addition of a basic solution and this liquid phase is conducted back into the reactor again to an extent of at least 50%.

Process for preparing unsaturated esters proceeding from aldehydes by direct oxidative esterification

The present invention concerns regulating the water content in a process for production of methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for production of methacrylic acid, methyl methacrylate or else of active, aroma or flavor chemicals. The present invention is particularly concerned with regulating the water content in a process for production of methacrolein from formaldehyde and propionaldehyde via a Mannich condensation.

Method of regulating the water content in a continuous method for producing methacrolein

The present invention relates to a process for preparing methyl methacrylate by direct oxidative esterification of methacrolein and the preparation of methacrolein. It is a feature of this novel process that it was possible to distinctly increase the yield and the efficiency of the process compared to the prior art through a sequence of different distillation steps.

Method for producing methacrolein and the conditioning/draining thereof for direct oxidative esterification

The invention relates to a process for production of at least one Coxidation product, comprising the steps: a) providing a feed composition comprising at least two feed compounds selected from tert-butyl alcohol, methyl tert-butyl ether and isobutylene; b) subjecting the feed composition to a catalytic reaction zone comprising at least one oxidation stage and obtaining a reaction phase comprising the Coxidation product, to a Coxidation product obtainable therefrom, to an apparatus for production of at least one Coxidation product, a process carried out in the apparatus, to a methacrylic acid, to a polymer comprising methacrylic acid and process for production thereof, to methyl methacrylate and a process for production thereof, to a methacrylate ester and a process for production thereof, to a polymer comprising at least one of methacrylic acid, methyl methacrylate and a methacrylate ester and a process for production thereof, to a composition comprising at least one of methacrylic acid, methyl methacrylate, a methacrylate ester and a polymer comprising at least one of methacrylic acid, methyl methacrylate and a methacrylate ester, to chemical products, and to the use of at least one of methacrylic acid, methyl methacrylate, a methacrylate ester, a polymer comprising at least one of methacrylic acid, methyl methacrylate and a methacrylate ester and a composition comprising at least one of these in chemical products.

Use of a feed compositions in preparation of methacrylic acid by oxidation

The invention relates to a process for reclaiming methacrylic acid from a high-boiler phase in a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid comprising the following steps a) Providing a high-boiler phase from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid b) Providing an aqueous phase, preferably organically loaded, from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid c) Mixing of components a) and b) optionally followed by filtration or centrifugation d) Adding an extraction media to the mixture from c) e) Subjecting the multiple-phase mixture from d) to at least one mixer-settler extraction process f) Recycling the organic phase from the last mixer-settler process back into the C4-process

Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase

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Pfungstadt, Germany

Torsten Balduf