Evonik Degussa Gmbh

Evonik Operations Gmbh

Philipp Roth

Christoph Weckbecker

Klaus Huthmacher

Christoph Kobler

Martin Hateley

Axel Ronneburg

Judith Hierold

Timo Stahl

Barbara Jaeger

Daniel Sudhoff

Harald Jakob

Hans Joachim Hasselbach

Imad Moussallem

Martin Steurenthaler

Christian Renner

Ulrich Krauss

Rainer Peter

Thorsten Merker

Daniel Fischer

Christian Kaiser

Martin Steffan

Markus Held

Helmut Mueller

Ulf Bindernagel

Barbara Jäger

Helmut MÜLLER

Jochen Peters

Klaus Ullherr

Oliver Gerundt

Paul Mehringer

Harald Ott

Martin Maerz

Frank Scholl

Thomas Beck

Jochen Lautenschlager

Rolf Barthelmess

Ralf Riebeling

Herbert Schaffert

Joachim Radtke

Faruk Civelek

Olaf Eistert

Heiko Wild

Tim Fleckenstein

A method for preparing guanidino acetic acid involves reacting cyanamide and glycine in an aqueous reaction mixture in the presence of a base. The ammonia content in the reaction mixture is controlled to be below 20 g/L, and the dicyandiatrade content in the reaction mixture is kept below 5 wt.-%.

Method for preparing guanidino acetic acid

The present invention pertains to a method for producing methionine or salts or derivatives thereof from hydrogen cyanide (HCN), the method comprising a step of producing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN), or a crude product mixture comprising MMP-CN, by contacting a hydrogen cyanide (HCN) process gas mixture prepared according to the Andrussow process from methane, ammonia and oxygen, with 3-methylmercaptopropionaldehyde (MMP), wherein the HCN process gas mixture is obtained from the crude HCN process gas mixture by adjusting the amount of ammonia to between 20% (v/v) and 60% (v/v) of the amount of the ammonia in the crude HCN process gas mixture.

Method for producing methionine

A modified method for preparing guanidino acetic acid (GAA) involves reacting cyanamide with an excess molar amount of glycine in an aqueous reaction mixture, in the presence of a base. The method avoids high molar amounts of base or acid for pH control, and maintains the reaction selectivity and product yields.

The present invention relates to a method for preparing methionine or methionine salts. In particular, the invention describes the step of preparing 2-hydroxy-4-(methylthio)butyronitrile (MMP-CN) from 3-methylthiopropanal (MMP) and hydrogen cyanide (HCN) in the presence of ammonia by bringing a gaseous mixture comprising HCN and ammonia into contact with MMP.

Method for preparing methionine

The present invention relates to a process for preparing acrolein from propylene by catalytic gas phase oxidation with molecular oxygen (for example air). The invention further relates to the use of particular propylene-containing starting materials, for example refinery grade propylene, for preparation of acrolein.

Method for producing acrolein

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

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

Ketomethionine ketals and hemiketals and derivatives thereof are useful as feed additives, in particular for the nutrition of ruminants.

Ketomethionine ketals and derivatives thereof

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Hanau, Germany

Philipp Roth