Wacker-chemie Gmbh

Wacker Chemie Ag

Wilfried Kalchauer

Herbert Straussberger

Bernd Pachaly

Jochen Gross

Willi Streckel

Willibald Streckel

Ulrich Goetze

Konrad Mautner

Norbert Zeller

Werner Graf

Anton Schinabeck

Karl Hutzler

Edwin Hengge

Lutz Roesch

Wolfgang Zoller

Hubert Bruckmeier

Christa Jammegg

The invention relates to a process for the direct synthesis of methylchlorosilanes by reaction of chloromethane with a contact composition comprising silicon and copper catalyst, wherein the concentration of oxygen in the chloromethane used is reduced by mixing a) chloromethane which contains oxygen, and b) chloromethane which contains a gaseous boron compound.

Process for preparing methylchlorosilanes

Aluminum chloride is removed effectively from compound mixtures containing organochlorosilanes such as are produced in the direct synthesis, by adding a diluent containing organochlorosilanes and optionally chloromethane to a solids content &#x3c;15% and a concentration of compounds having a boiling point &#x3e;71&#xb0; C. of less than 25%, and evaporating this diluted mixture into a volatile product stream and an AlCl-containing solid.

Method for separating aluminium chloride from organochlorosilanes

A process for the direct synthesis of methylchlorosilanes by reaction of chloromethane with a contact composition comprising silicon, copper catalyst and from 10 to 90 ppm of strontium leads to increased selectivity and higher production rate.

The invention relates to a process for the direct synthesis of methylchlorosilanes by reaction of chloromethane with a contact composition comprising silicon, copper catalyst and a total proportion of sodium and potassium of from 10 to 400 ppm.

Process for preparing silanes

Dust recirculation in the direct synthesis of chlorosilanes and methylchlorosilanes in a fluidized bed

The invention relates to a process for treating filter dusts which are produced during the melting of inorganic compounds, especially those containing fluorides and/or oxides, in which process the filter dusts are fused. The disposal of the fused filter dusts is simple.

Process for treating filter dusts

A process for the direct synthesis of organochlorosilanes using CuCl prepared from the copper-containing residues from the direct synthesis of organochlorosilanes, where, in the preparation of the CuCl, in a first step, copper from an aqueous suspension of the copper-containing residues is oxidized to CuCl,using mineral acid and oxidant, where mineral acid or oxidant or mineral acid and oxidant contain chlorine, giving an aqueous CuCl,solution, and in a second step, the aqueous CuCl,solution is reduced to CuCl using elemental iron.

Process for the direct synthesis of organochlorosilanes using recovered CuCl catalyst

In the process for the direct synthesis of methylchlorosilanes from chloromethane and silicon in the presence of a copper catalyst and promoter, the reaction mixture comprising chloromethane, methylchlorosilanes, and dust-like components comprising copper, promoter and silicon are removed continuously. The dust-like components are separated from the reaction mixture and cooled with liquid chloromethane.

Process for the preparation of methylchlorosilanes

Process for the preparation of organochlorosilanes

In a process for the direct synthesis of methylchlorosilanes, chloromethane is reacted with a catalyst composition comprising silicon, copper catalyst, zinc promoter and pyrogenic silicic acid.

Methylchlorosilanes are prepared by reacting methyl chloride with a contact catalyst which comprises silicon, copper catalyst, zinc promoters and tin promoters and/or antimony promoters, in which hydrogen chloride is added in the course of from 1% to 45% of the duration of the production campaign.

Process for preparing organochlorosilanes

In the direct synthesis of methylchlorosilanes by reacting methyl chloride with a catalyst composition which comprises silicon, copper catalyst, zinc promoters and tin promoters and/or antimony promoters, a catalyst composition is used which was activated in advance by treatment with HCl under specific activation conditions.

A process for preparing dimethyldichlorosilane by reacting chloromethane with silicon in the presence of a catalyst combination comprising the metals or compounds of the metals copper, zinc and tin and/or antimony, and chlorosilanes or chlorodisilanes as activators. The activators are fed into the reactor as a gas containing at most 15% by volume of hydrogen.

Process for preparing dimethyldichlorosilane

A process is described for the electrochemical preparation of organosilicon compounds having at least one SiC-bound organic radical, a solution which contains at least one halosilane being subjected to an electrochemical reaction, an anode which contains a noble metal or an alloy consisting essentially of one or more noble metals having a halogen scavenger flowing around said anode.

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Burghausen, Germany

Wilfried Kalchauer