Evonik Rohm Gmbh

Evonik Roehm Gmbh

Roehm Gmbh & Co Kg

Rohm Gmbh

Udo Gropp

Thomas Mertz

Thomas Schaefer

Steffen Krill

Andreas Perl

Robert Weber

Rudolf Sing

Stefanie Sohnemann

Matthias Groemping

Hermann Siegert

Jochen Ackermann

Alexander May

Guido Protzmann

Bernd Vogel

Soenke Broecker

Arndt Selbach

Ruediger Carloff

Matthias Grömping

Lorenza Sartorelli

Norbert Mnich

Horst Hiltner

Joachim Deinken

Friedel Schultheis

Hans-Rolf Rausch

Ingrid Lunt-Rieg

Thomas SCHÄFER

Sönke BRÖCKER

The present invention relates to a process for preparing alkyl methacrylates and their conversion products which can be used in a multitude of chemical synthesis processes which can lead to a wide variety of different further processing products, and to an apparatus for performing this process.

Process and apparatus for preparing alkyl esters of methacrylic acid

The present invention relates to a process for hydrolysis of acetone cyanohydrin (ACH) by means of sulphuric acid within the ACH sulpho process for preparation of methacrylic acid (MAA) or methyl methacrylate (MMA).

Method for hydrolysing acetone cyanohydrin

The present invention relates to an apparatus for metering flowable media or gases, and to the use thereof.

Metering ring

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

Transesterification methods

A reactor for preparing hydrogen cyanide by the Andrussow process is provided. The reactor comprises at least one gas inlet which opens into a gas inlet region, an outlet for the reaction products and a catalyst, wherein at least one mixing element and at least one gas-permeable intermediate layer are within the reactor between the gas inlet region and the catalyst. The mixing element is arranged between the gas inlet region and the gas-permeable intermediate layer. A process for preparing HCN, in the reactor is also provided.

Reactor for preparing hydrogen cyanide by the Andrussow process

The present invention relates in general terms to a process for preparing alkyl methacrylates, comprising as steps:

Method for producing methacrylic alkyl esters by way of azeotropic distillation

The present invention relates to a method for producing methacrylic acid by reacting methacrylamide with water, wherein said reaction is performed continuously in a tube reactor and a pressure differential exists in the flow direction of the reaction mixture inside said tube reactor. Furthermore, the present invention discloses a facility for carrying out the method according to the invention.

Method for producing methacrylic acid

The present invention relates to a process for purifying methacrylic acid, wherein the reaction mixture obtained by a reaction of methacrylamide with water is cooled by mixing with an aqueous medium and then passed into a phase separator. The present invention further describes a system for performing the process according to the invention.

Method for purifying methacrylic acid

The present invention relates in general terms to a process for preparing acetone cyanohydrin, comprising as steps:

Method for producing acetone cyanohydrin and the subsequent products thereof by specific cooling

The invention relates in general terms to a process for preparing to a process for purifying an alkyl methacrylate, comprising the steps of:

Method for the adsorptive purification of alkyl methacrylates

Production by distillation of acetone cyanhydrin and method for producing methacrylic ester and subsequent products

The invention relates to a process for preparing acetone cyanohydrin and to a process for preparing alkyl methacrylates, in which an acetone cyanohydrin as can be prepared in accordance with the present invention is used.

Process for preparing cyanohydrins and their use in the preparation of alkyl esters of methacrylic acid

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

Methods for producing alkyl(meth)acrylates

The invention relates to a process for the selective, economically viable preparation of methacrylic acid and methacrylic esters starting from acetone cyanohydrin, wherein, in a first step, 2-hydroxy-2-methylpropionic acid is prepared by reacting acetone cyanohydrin with sulphuric acid in the presence of water and a suitable polar solvent and is isolated and methacrylic acid is subsequently prepared by &#x3b2;-elimination of water starting from 2-hydroxy-2-methylpropionic acid.

Method for producing alpha-hydroxycarboxylic acids and the esters thereof

The invention relates to a process for continuous preparation of alkyl (meth)acrylates by transesterification of methyl (meth)acrylate using alcohols which are high-boiling relative to methanol. A particular workup technique achieves product qualities which have hitherto not been attained. Very high space-time and overall yields can also be achieved.

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Bad Endorf, Germany

Udo Gropp