Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Alfred Alig

Ulrich Deschler

Karsten Korth

Christoph Batz-Sohn

Philipp Albert

Rudolf Michel

Werner Will

Ingo Kiefer

Dorit Wolf

Reimund Pieter

Raymund Sonnenschein

Hans Christian Alt

Gerd Rainhard Zezulka

J&ouml;rg M&uuml;nzenberg

Steffen Seebald

Louis Janssens

Albert Frings

Karl-Heinz R&uuml;tzel

Stefan Lotter

Andreas Gölz

Stephanie Schwan

Sefan Koenigstein

Helmut Droege

Helmut DRÖGE

Stefan Koenigstein

The invention relates to a process for preparing organosilanes of the general formula I by reacting (haloorganyl)alkoxysilane of the formula II with hydrous alkali metal hydrogensulphide, sulphur and alkali metal carbonate in alcohol, wherein the molar (haloorganyl)alkoxysilane of the formula II to alkali metal hydrogensulphide ratio is between 1:0.4 and 1:0.75, and the molar alkali metal hydrogensulphide to alkali metal carbonate ratio is between 1:0.5 and 1:1.5.

Process for preparing organosilanes

The present invention relates to a process for preparing mercaptoorganyl(alkoxysilanes), by hydrogenating bis(alkoxy-silylorganyl) polysulphides with hydrogen in the presence of at least one alcohol and a doped metal catalyst. The doped metal catalyst comprises at least one substance from the group consisting of iron, iron compound, nickel, nickel compound, palladium, palladium compound, osmium, osmium compound, ruthenium, ruthenium compound, rhodium, rhodium compound, iridium and iridium compound plus at least one doping component.

Process for preparing mercaptoorganyl (alkoxysilanes)

A process for the preparation of an organosilicon compound of the formula (I)(RRRSiR)S&#x2003;&#x2003;(I)by reacting haloalkoxysilanes of the general formula (II)RRRSiRX&#x2003;&#x2003;(II)with a dry polysulphide of the general formula (III)MS&#x2003;&#x2003;(III)and/or dry sulphide of the general formula IVMS&#x2003;&#x2003;(IV)and optionally sulphur in an organic solvent, the organic solvent being removed from the resulting suspension, the mixture containing the organosilicon compound of the general formula (I) and the solid MX being mixed with water containing at least one buffer, and the resulting phases being separated.

Process for the preparation of organosilicon compounds

A process and a device for producing anhydrous alkali sulfide, wherein an alkali sulfide solution, alkali sulfide suspension, alkali sulfide dispersion or alkali water of crystallization melt is dried by spray drying with inert drying gas loaded with water vapor.

Spray drying process for producing anhydrous alkali sulfide

A method of preparing anhydrous sodium sulfide having an Na S content of at least 98 wt %, by drying hydrous sodium sulfide having a water content of 35 to 45%, provided as a solid or in liquefied form, by intensively kneading and mixing hydrated sodium sulfide at an elevated temperature and pressure to thereby liquify said hydrated sodium sulfide and obtain the anhydrous sodium sulfide.

Method for the preparation of anhydrous sodium sulfide

The invention relates to a process for the preparation of organosilylalkylpolysulfanes, of the general formula I (R R R SiR ) S (I) by reaction of organosilylalkylpolysulfanes of the general formula II (R R R SiR ) S (II) with an ionic sulfide of the general formula M S (III) and an organosilylalkyl halide of the general formula R R R SiR X (IV), the long-chain organosilylalkylpolysulfane of the general formula (II) and the organosilylalkyl halide of the general formula (IV) being initially introduced into the reaction vessel and the ionic sulfide of the general formula (III) being added to this solution in several portions.

Process for the preparation of organosilylalkylpolysulfanes

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Geiselbach-Omersbach, Germany

Alfred Alig