Evonik Roehm Gmbh

Evonik Degussa Gmbh

Soenke Broecker

Hermann Siegert

Alexander May

Bernd Vogel

Jochen Ackermann

Udo Gropp

Robert Franke

Dirk Fridag

Klaus-Diether Wiese

Hans-Gerd Lueken

Markus Priske

Udo Lenz

Markus Rudek

Christoph Patalong

The present invention relates to a method and a device for controlling the viscosity of reaction solutions in the hydroformylation of olefin-containing mixtures.

Control of the viscosity of reaction solutions in hydroformylation processes

The present invention relates to processes for transesterification, comprising the steps of

Transesterification methods

Alpha-hydroxycarboxylic esters are prepared by a continuous process in which alpha-hydroxycarboxamide is reacted with an alcohol in the presence of a catalyst to obtain a product mixture which contains alpha-hydroxycarboxylic ester, ammonia, unconverted alpha-hydroxycarboxamide and alcohol, and catalyst; wherein reactant streams containing an alpha-hydroxycarboxamide, an alcohol and a catalyst are fed into a pressure reactor. The reactant streams are reacted with one another in the pressure reactor at a pressure in the range of 1 bar to 100 bar; and the product mixture is depleted in alcohol and ammonia by distilling off ammonia at a pressure which is constantly kept greater than 1 bar without the aid of additional stripping media. The continuous process can be employed particularly advantageously on the industrial scale.

Process for preparing alpha-hydroxycarboxylic esters

The present invention relates to a process for preparing carboxamides by hydrolysing carbonitriles in the presence of a catalyst comprising manganese dioxide, wherein the reaction mixture added to the catalyst comprising manganese dioxide has a pH in the range of 6.0 to 11.0 and the hydrolysis is performed in the presence of an oxidizing agent. The present invention further relates to a process for preparing alkyl (meth)acrylates, the process having a hydrolysis step according to the process described above.

Process for preparing carboxamides by hydrolysis carboxylic acid nitriles in the presence of a catalyst comprising manganese dioxide

The present invention relates to processes for preparing alkyl (meth)acrylates, comprising the steps of

Methods for producing alkyl(meth)acrylates

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Ober-Ramstadt, Germany

Soenke Broecker