Evonik Roehm Gmbh

Rohm Gmbh

Evonik Rohm Gmbh

Evonik Degussa Gmbh

Evonik Operations Gmbh

Alexander May

Hermann Siegert

Bernd Vogel

Steffen Krill

Marcel Treskow

Soenke Broecker

Jochen Ackermann

Udo Gropp

Belaid Ait Aissa

Martin Koestner

Joerg Becker

Diego Carambia

Gabriel Avella

Lothar Eggeling

Achim Marx

Franz-Felix Kuppinger

Matthias Groemping

Thomas Quandt

Marc Becker

Markus Poetter

Stefan Buchholz

Florian Klasovsky

Kurt-Alfred Gaudschun

Jörg Schallenberg

Markus Pötter

Willi Ploesser

Min-Zae Oh

Zoe Zegers

Kevin Lackey

Ghanem Sabeeh

Birgit Alber

Georg Fuchs

Joerg Schallenberg

Jerald Andrew Jones

Jörg Becker

Martin KÖSTNER

Willi PLÖSSER

Sönke BRÖCKER

A process can be used for producing a distillate product with a methanol concentration greater than the concentration of methanol in the minimum boiling azeotrope of methanol and methyl (meth)acrylate, from a mixture with a methanol concentration less than the concentration of methanol in the minimum boiling azeotrope of methanol and methyl (meth)acrylate, in a distillation column. A transesterification process for preparing C- to C-alkyl, aryl or alkenyl (meth)acrylates from methyl (meth)acrylate is also provided.

Process for separation of methanol and methyl (meth)acrylate

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

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.

The present invention relates to a process for preparing alpha-hydroxycarboxylic esters proceeding from hydrogen cyanide, wherein the ammonia formed in the step of alcoholysis of the corresponding alpha-hydroxycarboxamide is recycled into a hydrogen cyanide preparation process after a purification step.

Method for preparing alpha-hydroxycarboxylic acid esters in which ammonia is recycled

The present invention relates to a process for preparing alpha-hydroxycarboxylic esters from the alcoholysis of alpha-hydroxycarboxamides in the gas phase, characterized in that the conversion is effected in the presence of water.

Method for producing alpha-hydroxy carboxylic esters in the gas phase

The present invention describes a process for preparing alpha-beta-unsaturated carboxylic acids by dehydration of hydroxycarboxylic or alkoxycarboxylic acids which are substituted in the alpha position, in particular 2-hydroxyisobutyric acid, while avoiding accumulation of by-products and additives.

Method for dehydrating alpha-substituted carboxylic acids

Method for producing acrylic acid by dehydration of a Chydroxycarboxylic acid, characterized in that dehydration is achieved by contacting, at a temperature of more than 150&#xb0; C., the hydroxycarboxylic acid with a mixture which is liquid at this temperature and comprises at least one metal salt of a Chydroxycarboxylic acid, and water.

Method for producing acrylic acid

The present invention relates to a catalyst for reacting carbonitriles with water, wherein the catalyst comprises at least 60% by weight of manganese dioxide with an empirical formula MnOx where x is in the range from 1.7 to 2.0, and at least one plasticizer. The present invention further relates to a process for preparing the catalysts detailed above and to a process for preparing carboxamides by reacting carbonitriles with water in the presence of the present catalyst.

Catalyst for reacting carboxylic acid nitriles

The present invention relates to a process for the preparation of methacrylic acid or methacrylic esters, comprising the process steps of The invention also relates to a process for the preparation of polymethacrylic acid or polymethacrylic esters.

Process for preparing methacrylic acid or methacrylic esters

The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.

Method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid

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 a process for preparing (meth)acrylic acid, characterized in that a cyclic ester is converted to (meth)acrylic acid in the presence of a catalyst. The (meth)acrylic acid prepared can in particular be converted to (meth)acrylates.

Process for preparing (meth)acrylic acid

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

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Seeheim-Jugenheim, Germany

Alexander May