Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Degussa - Huls Ag

Alexander Möller

Harald Heinzel

Stephan Rautenberg

Wolfgang Taugner

Wolfgang Böck

Georg Thiele

Heinz Friedrich

Steffen Hasenzahl

Georg Markowz

Hans-Joachim Hasselbach

Hubertus Eickhoff

Gustaaf Goor

Hans-Albrecht Hasseberg

Wedigo Von Wedel

John Tarabocchia

Herbert Kuhn

Kurt Winkler

Theo Zarfl

Manfred Weck

Ulrich Schelbert

Volker Häfner

Mathias Viandt

Eckehart E Roland

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

Granulates which contain titanium silicalite-1 are composed of silicon dioxide, titanium dioxide and titanium silicalite-1 crystals. The granulates can be prepared by spray-drying or spray granulating the crystallization suspension. The granulates may be used as suspension catalysts, such as for the epoxidation of olefins using hydrogen peroxide.

Granulates which contain titanium silicalite-1

Disclosed is a process for the degradation of highly toxic halogenated organic compounds, in particular polychlorinated dibenzodioxins (PCDD) and dibenzofurans (PCDF), contained in gases containing no SO.sub.2 by oxidation using preferably hydrogen peroxide. The SO.sub.2 -free gas is passed, in the presence of hydrogen peroxide, over a substantially inorganic solid contact catalyst, in particular pyrogenic or precipitated silica or aluminum silicate. A residual PCDD/PCDF content of below 0.1 ng TE/Nm.sup.3 may be achieved in the thus treated gas; the highly toxic compounds are oxidized on the solid contact catalyst.

Process for the degradation of highly toxic halogenated organic

The invention is directed to a method of producing coarse-crystalline nicotinic acid with a high degree of purity in which 3-cyanopyridine is saponified with aqueous alkali hydroxide and the nicotinic acid is allowed to crystallize out of the alkali nicotinate solution obtained in this manner under the addition of mineral acid at temperatures between 99.degree. and 135.degree. C. The pH is kept above 3.7.

Method of producing-coarse crystalline nicotinic acid with a high degree

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Gelnhausen, Germany

Alexander Möller