Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Degussa - Huls Ag

Asta Medica, Aktiengesellschaft

Degussa Gmbh

Evonik Industries Ag

Vertellus Specialties Inc.

Degussa Dental Gmbh & Co. Kg

Evonik Operations Gmbh

Klaus Huthmacher

Christoph Weckbecker

Steffen Krill

Walter Pfefferle

Hans Joachim Hasselbach

Mike Farwick

Horst Weigel

Frank Hubner

Brigitte Bathe

Hubert Redlingshöfer

Jan-Olaf Barth

Michael Binder

Herbert Klenk

Martin Hateley

Achim Fischer

Axel Kleemann

Georg Thierbach

Herbert Tanner

Dieter Greissinger

Bernd Drapal

Harald Jakob

Horst Bethge

Christoph Kobler

Harald Heinzel

Volker Hafner

Rainer Hahn

Nongyuan Shi

Steffen Osswald

Thomas Beisswenger

Hans-Joachim Hasselbach

Roland Moller

Hermann Schmitt

Alfred Puehler

Hubert Redlingshoefer

Joern Kalinowski

Qi Yuan Wang

Rainer Peter

Yiquan Yang

Aiping Chen

Christian Rueckert

Achim Marx

Bettina Moeckel

Stephan Kretz

Stephan Rautenberg

Dieter Buss

Philipp Roth

Jürgen Bilz

Horst Krull

Gunes Giray

Thomas Häussner

Shenjun Dai

Weiping Fang

Thomas Lied

Guenes Giray

Martin Korfer

Maria-Regina Kula

Thomas Hermann

Werner Hummel

Martin Koerfer

Werner Burkhardt

Stefan Verseck

Caspar-Heinrich Finkeldei

Alfred Olbrich

Rainer Gewald

Gerhard Sator

Andreas Dörflein

Friedhelm Geiger

Klaus Hentschel

Hans-Albrecht Hasseberg

Stefan Reichert

Hongbin Zhang

Birgit Geueke

Ksenia Egorova

Karlheinz Drauz

Matthias Beller

Ralf Jackstell

Mario Scholz

Steffen Hasenzahl

Georg Markowz

Horst-Werner Zanthoff

Jörn Kalinowski

Natalie Schischka

Wilhelm Keim

Joachim Goede

Andreas Martin

Alfred Pühler

Hans Christian Alt

Dieter Heinz

Axel Ronneburg

Ralph McIntosh

Martin Körfer

Jose Vanrobaeys

Heinrich Petsch

Peter M Schalke

Dieter Most

Joachim Pohlisch

Wolfram Binder

Stefan Röder

Wolfgang Böck

Gottfried Blaschke

This disclosure relates to a process for preparing D,L-methionine by feeding carbon dioxide to an aqueous potassium methioninate solution obtained by hydrolysis of 5-(2-methylmercaptoethyl)hydantoin, in order to precipitate out crude methionine, which is separated off and purified. In this process an aqueous solution of the separated-off crude methionine is purified by recrystallization from a solution containing potassium ions and also a crystallization additive. The crystallization additive is a nonionic or anionic surfactant, or a mixture of different nonionic or anionic surfactants. The recrystallization occurs by introducing a 60 to 110&#xb0; C.-hot methionine solution into a 35 to 80&#xb0; C.-warm methionine suspension, a temperature of which is lower than that of the introduced solution, such that the temperature of the methionine suspension being maintained between 35 and 80&#xb0; C. during the addition. The crystallization additive is a sorbitan fatty acid ester or a mixture of different sorbitan fatty acid esters.

Process for the preparation of methionine

This invention is related to a preparation method of a supported catalyst Mo&#x2014;O&#x2014;K-MeOfor the synthesis of methanethiol from HS-containing syngas. The catalyst comprises of an active component of Mo&#x2014;O&#x2014;K-based species, an active promoter and a support denoted as metal (or metals)-carrier. The support is prepared by electroless plating method in such a way that the metal or metals chosen are plated onto the surface of the carrier. Transition metal, especially Fe, Co or Ni are selected to be the plating metal, while SiO, AlOor TiOare selected to be carrier. The catalyst thus prepared is found to be efficient for the synthesis of methanethiol from HS-containing syngasor carbon oxides/hydrogen mixtures, especially regarding a minor formation of the by-product CO.

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The invention relates to a process for the preparation of D,L-methionine, in which carbon dioxide is fed to an aqueous potassium methioninate solution obtained by hydrolysis of 5-(2-methylmercaptoethyl)hydantoin, in order to precipitate out crude methionine, which is separated off and purified, where, for the purposes of purification, an aqueous solution of the separated-off crude methionine is prepared and subjected to a recrystallization, characterized in that the solution from which the recrystallization takes place contains potassium ions and also a crystallization additive, where the crystallization additive is a nonionic or anionic surfactant, or a mixture of different nonionic or anionic surfactants, and that the recrystallization takes place by introducing a 60 to 110&#xb0; C.-hot methionine solution into a 35 to 80&#xb0; C.-warm methionine suspension, the temperature of which is lower than that of the introduced solution, the temperature of the methionine suspension being maintained between 35 and 80&#xb0; C. during the addition.

A method is described to prepare a Mo containing supported catalyst comprising TeOas active promoter and a process for preparing methanethiol in the presence of said catalyst.

Mo containing catalyst, a preparation method and a method for preparing methyl mercaptan

Disclosed herein are mixed oxide catalysts for the catalytic gas phase oxidation of alkanes, or mixtures of alkanes and olefins, for the production of aldehydes and carboxylic acids with air or oxygen in the presence of inert gases at elevated temperatures and pressure, and a method for the production of catalysts.

Mixed oxide catalysts for catalytic gas phase oxidation

The invention relates to a catalyst containing alkali tungstate for the synthesis of alkylmercaptanes from alkanols and hydrogen sulphide, in addition to a method for the production of said catalyst, wherein the molar ratio of alkali to tungstan is &#x3c;2:1.

Catalysts containing tungstate for the synthesis of alkyl mercaptan and method for the production thereof

The invention relates to a catalyst containing alkali tungstate for the synthesis of alkylmercaptanes from alkanols and hydrogen sulphide, in addition to a method for the production of said catalyst, wherein the molar ratio of alkali to tungsten is &#x3c;2:1.

A method for preparing &#x3b1;-keto acids, especially &#x3b1;-ketomethionine, and/or derivatives thereof, whereby an aldehyde is reacted with thiols to give a corresponding dithioacetal, the dithioacetal formed, is reacted with an electrophile in the presence of a strong base, and the resulting &#x3b1;,&#x3b1;-(dithio)carboxylic acid is solvolyzed with acid-catalysis to release thiol and give the &#x3b1;-keto acid or a derivative thereof. Umpolung of aliphatic or aromatic aldehydes is effected by reaction with thiols.

Process for preparing &#x3b1;-keto acids and derivatives thereof

Disclosed herein are mixed oxide catalysts for the catalytic gas phase oxidation of alkanes, or mixtures of alkanes and olefins, for the production of aldehydes and carboxylic acids with air or oxygen in the presence of inert gases at elevated temperatures and pressures, and methods for the production of the catalyst.

A chemical compound of the general formula I or II is useful as feed additive: wherein X=O or NR, and R=H, C-C-alkyl (optionally branched), C-C-cycloalkyl, aryl, or aralkyl, and wherein R, R, are identical or different and in each case H, C-C-alkyl (optionally branched), C-C-cycloalkyl, allyl, aryl, or aralkyl; or Rand Rtogether are an C- to C-alkylene group (optionally C-C-alkyl substituted).

2-methylthioethyl-substituted heterocycles as feed additives

A device for carrying out exothermal chemical reactions wherein a gas phase is guided across a fixed bed and allowed to react, comprising a housing and an exchangeable unit wherein the reaction takes place.

Device for carrying out chemical reactions

The invention relates to mixed oxide catalysts for the catalytic gas-phase oxidation of olefins and methylated aromatics, processes for producing the catalysts and the reaction with air or oxygen in the presence of inert gases in various ratios at elevated temperatures and pressure to form aldehydes and carboxylic acids.

Mixed oxide catalysts for the catalytic gas-phase oxidation of olefins and processes for producing them

The present invention relates to a process for continuously preparing methyl mercaptan from hydrogen sulphide and methanol in a direct connection with the preparation of hydrogen sulphide.

Process for preparing methyl mercaptan

Provided is a process for continuously preparing methyl mercaptan by reacting a reactant mixture comprising solid, liquid and/or gaseous carbon- and/or hydrogen-containing compounds with air or oxygen, and/or water and sulfur.

Process for continuously preparing methyl mercaptan from carbon- and hydrogen-containing compounds

Disclosed herein are cyanide-tolerant nitrile hydratases especially fromorstrains which exhibit increased cyanide tolerance. Also disclosed are methods of preparing amides from nitriles in the presence of cyanides and polynucleotide sequences coding for cyanide-tolerant nitrile hydratases.

Polynucleotides which code for cyanide-tolerant nitrile hydratase and compositions thereof

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Gelnhausen, Germany

Klaus Huthmacher