Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Degussa - Huls Ag

Harald Heinzel

Klaus Huthmacher

Alexander Möller

Volker Hafner

Hans Joachim Hasselbach

Stephan Rautenberg

Wolfgang Taugner

Wolfgang Böck

Christoph Weckbecker

Hans-Joachim Hasselbach

Hans-Albrecht Hasseberg

Hans Albrecht Hasseberg

Hubert Redlingshöfer

Herbert Tanner

Stephan Kretz

Jan-Olaf Barth

Caspar-Heinrich Finkeldei

Axel Ronneburg

Achim Fischer

Barbara Jager

Volker Häfner

Theo Zarfl

Hans-Albrechl Hasseberg

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 a reaction vessel in which hydrogen sulphide is prepared from sulphur and hydrogen, wherein the reaction vessel consists partly or entirely of a material which is resistant to the reaction mixture, its compounds or elements and retains its resistance even at high temperatures.

Reaction vessel and process for its use

The invention provides a process for the removal of polysulfanes from gas streams formed during HS synthesis.

Process for the conversion of polysulfanes

The invention relates to a method for the separation of methyl mercaptan from reaction gas mixtures obtained by means of the catalytic conversion of H2S with methanol, by means of converting the methyl mercaptan into MMP in the presence of the byproducts with acrolein, and separating the same.

Method for the separation of methyl mercaptan from reaction gas mixtures

A process for the preparation of 2-hydroxy-4-methylthiobutyric acid.

Preparation of 2-hydroxy-4-methylthiobutyric acid

A process is provided for the recovery of sulfuric acid from NH.sub.4 HSO.sub.4 and (NH.sub.4).sub.2 SO.sub.4 salts produced from the sulfuric acid hydrolysis of methylmercaptopropionaldehyde (MMP) cyanohydrin to produce 2-hydroxy-4-methylthiobutyric acid (MHA), which can be used as an additive in animal feed. The sulfate salts are combusted in a furnace to produce sulfur dioxide; the sulfur dioxide is contacted with an aqueous solution containing sulfuric acid and hydrogen peroxide, where the sulfur dioxide is converted into sulfuric acid. The product sulfuric acid is recovered.

Method for recovering sulfuric acid from sulfate salts

Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA)

A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.

Method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is

Process for recovering 2-hydroxy-4-methylthiobutyric acid (MHA), MHA and

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Altenstadt, Germany

Harald Heinzel