Evonik Operations Gmbh

Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Martin Körfer

Klaus Huthmacher

Christoph Weckbecker

Hans-Joachim Hasselbach

Harald Jakob

Steffen Krill

Cornelia Borgmann

Hans Joachim Hasselbach

Stephan Kretz

Ralf Goedecke

Stephan Rautenberg

Benjamin Fonfe

Caspar-Heinrich Finkeldei

Hans Christian Alt

Thomas Müller

Dieter Buss

Bernd Drapal

Pablo Zacchi

Chiu Kee Cheung

Martin Steurenthaler

Jürgen Bilz

Rainer Peter

Horst Krull

Judith Hierold

Thorsten Merker

Lucas Geist

Caspar Heinrich Finkeldei

Ralf Maassen

Stefan Wenner

Stefan Reichert

Michael R Rinner

Wolfgang Böck

Christian Kaiser

Jignesh Gangadwala

Christian Reus

Anja Nordschild

Jürgen Stock

Jose Vanrobaeys

Martin Steffan

Sascha Ceylan

Franz H Hanrath

Dominik Egly

Michael Eicker

Rainer Malzkorn

Sebastian Bernhardt

Antje Hansmeier

Geert Van Eester

Benny Hartono

Ron Stockfleth

Gundolf Hornung

Daniel Rost

Catrin Dorothee Becker

Bruno Krudewig

Marko Bussmann

Haohao Zhu

Gerit Niggemann

Peter Schulte

Christof P GRÜNER

Caspar Heinrich Finkeldel

DrDieter Buss

The invention refers to the use of a particulate catalyst containing 60.0 to 99.5 wt. % ZrOstabilised with an oxide of the element Hf and at least one oxide of the element M, wherein M=Ce, Si, Ti, or Y, for the hydrolysis reaction of methionine amide to methionine, wherein the median particle size xof the particulate catalyst is in the range of from 0.8 to 9.0 mm, preferably of from 1.0 to 7.0 mm. The invention also refers to a process for preparing methionine comprising a step of contacting a solution or suspension comprising methionine amide and water with said particulate catalyst to provide a reaction mixture comprising methionine and/or its ammonium salt from which methionine can be isolated.

Salt-free production of methionine from methionine nitrile

The present invention relates to a process for the purification of hydrogen cyanide, comprising the steps of a) splitting a liquid feed stream () comprising hydrogen cyanide into at least a first liquid stream () and a second liquid stream (), b) introducing the first liquid stream () into a distillation column () at a point between the top and the bottom of the distillation column, c) introducing the second liquid stream () into the distillation column () at the top of the distillation column, d) withdrawing an overhead vapor stream () enriched in hydrogen cyanide from the distillation column (), and e), withdrawing a bottom stream () depleted in hydrogen cyanide, wherein the temperature of the second liquid stream () in step c) is lower than the temperature of the first liquid stream () in step b).

Process for the purification of hydrogen cyanide

A process for preparing methionine includes the alkaline hydrolysis of 5-(2-methylmercaptoethyl)-hydantoin (methionine hydantoin) in an aqueous process solution containing alkali metal hydroxide and/or alkali metal carbonate and/or alkali metal hydrogencarbonate. The alkali metal cations in the process solution are potassium and sodium having a K/Na molar ratio range from 99/1 to 20/80.

Process for preparing methionine

The reaction tube for preparing hydrogen cyanide comprises a cylindrical tube composed of ceramic, a catalyst comprising platinum applied to the inner wall of the tube and also at least one insert composed of ceramic, having three or four fins pointing from the tube axis to the inner wall of the tube, which is inserted into the cylindrical tube, wherein the fins divide the tube interior space into substantially straight channels with substantially identical circle segment cross sections and wherein the mean gap between the ends of the fins and the inner wall of the tube is in the range of 0.1 to 3 mm. In the method for preparing hydrogen cyanide, ammonia and at least one aliphatic hydrocarbon having 1 to 4 carbon atoms are reacted in the reaction tube at 1000 to 1400&#xb0; C.

Reaction tube and method for producing hydrogen cyanide

The invention relates to a method for thermally after-burning the waste gas flows developing during the production of acrolein in a gas phase process and for thermally after-burning the waste gas flows developing during the production of hydrocyanic acid in a gas phase process, characterized in that the waste gas flows from the production of acrolein and the waste gas flows from the production of hydrocyanic acid are supplied to a joint thermal after-burning process.

Method for thermally after-burning waste gases from acrolein and hydrocyanic acid production

A process for purifying COoffgas streams to free them of chemical compounds, and to the recycling of the purified gas streams into the production process.

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The present invention is directed to an improved process for producing methionine in which the by-product methionyl-methionine is quickly converted to the product methionine by a hydrolysis reaction. The process is performed at high temperatures (200&#xb0; C. to 280&#xb0; C.) and short residence times (20 s to 200 s) and results in an improved yield of end product methionine.

Process for producing methionine

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Kahl, Germany

Martin Körfer