Wacker-Chemie Gmbh

Wacker Chemie Ag

Konrad Mautner

Anton Schinabeck

Gudrun Tamme

Karl-Heinz Rimboeck

Werner Geissler

Bernward Deubzer

Richard Weidner

Helmut Oswaldbauer

Andreas Bockholt

Bernd Pachaly

Wilfried Kalchauer

Herbert Straussberger

Klaus Kaeppler

Ulrich Goetze

Jochen Gross

Paul Fuchs

Volker Hoellein

Reinhardt Mueller

Gerhard Nagy

Karl-Heinz Rimböck

Christian Kaltenmarkner

Bernd K&ouml;hler

Till Wuestenfeld

Hilmar Sinner

Javad Mohsseni

Martin Kankowsky

Erwin Schuhbeck

Manfred Böck

Peter Nuernberg

Manfred Boeck

Peter Nürnberg

Groß Jochen

Werner Geißler

Till WÜSTENFELD

A process for refining crude molten silicon. The process includes oxidatively refining the crude molten silicon in the production of technical silicon. The crude molten silicon is admixed during the refining with a particulate mediator which has a minimum amount of metallic silicon of 8% by mass and also at least one or more of the elements H, C, O, F, Cl, Ca, Fe and Al. The particulate mediator is described by a characteristic number K which has a value of 0.03 to 6 mmand is calculated using the formula where dis the particle size (diameter) at 50% of the mass undersize of the grading curve of the particulate mediator [mm] and the εis the mean effective porosity of the particulate mediator.

Method for refining crude silicon melts using a particulate mediator

Silicon metal-containing agglomerates are produced by agglomerating a mixture of finely divided silicon metal-containing particles having a particle size parameter d50 of not more than 250 μm and in the dry state a silicon metal content of at least 10% by mass, at least one binder containing 90% to 98% by mass of silicon dioxide and having a specific surface area of 15 to 35 m/g, and water,

Process for producing silicon metal-containing agglomerates

Technical silicon is produced by heating a raw material mixture comprising particulate silicon metal-containing material and a particulate mediator containing at least one of C, O, Al, Ca and Si, to at least 1490° C., forming a liquid silicon phase, and solidifying this phase, wherein the raw material mixture a characteristic number K of from 0.000 to 60, calculated as follows:

Method for producing technical silicon

Silicon and silica values are obtained from recycled organosilicon products such as silicones, by introducing a recycle feed containing the organosilicon products into an electric furnace while producing metallurgical grade silicon from a silica source and a carbon source.

Recycling of materials containing organosilicon compounds

Aluminum chloride is separated from a silane mixture containing aluminum chloride by reacting the aluminum chloride with a compound reactive therewith which forms an ionic liquid or solid, and separating the ionic liquid or solid from the now-purified silane.

Process for separating aluminum chloride from silanes

Impure gaseous hydrogen chloride from organochlorosilane hydrolysis is freed of impurities by first scrubbing with an organochlorosilane, which may be the same or different from the organochlorosilane(s) hydrolyzed, and then further scrubbing with chloromethane. The purified gaseous hydrogen chloride is preferably used in chlorosilane synthesis.

Method for purifying contaminated gaseous hydrogen chloride

Cleaning industrial plant components to remove silane, metal halide, and organometallic halide contaminants and mixtures thereof, involves treating the plant components with a liquid nitrile or amine or mixture thereof or with a solution of a nitrile or amine or mixture thereof in an aprotic solvent.

Cleaning industrial plant components to remove metal halides

Alkyl chlorosilanes from the manufacture of dialkyldichlorosilanes are rearranged in continuous fashion to dialkyldichlorosilane by a rearrangement reaction in a moving bed reactor employing a solid alumina catalyst containing aluminum chloride, spent catalyst being continuously removed from the reactor.

Method for producing alkyl chlorosilanes by way of rearrangement reactions

Pneumatic conveying of fine solids in the direct synthesis of alkylchlorosilanes conveying gas containing at least 50% by volume of alkyl chloride. The conveying apparatus preferably contains a means for switching conveying gas in the pneumatic conveying of fine solids.

Conveying of fine solids in the synthesis of alkylchlorosilanes

Highly alkyl-substituted disilanes generally considered as uncleavable, obtained as part of the residue of alkylchlorosilane synthesis, are converted into cleavable disilanes having fewer alkyl groups by reaction with hydrogen halide in the presence of an alumina catalyst. The resulting disilanes can be cleaved into commercially valuable monosilanes by conventional processes.

Process for conversion of disilanes

The object of the invention is a method for preparing silanes of the general formula (1) RHSiCl(1), wherein mixtures of silanes of the general formulas (2) and (3) RSiCl(2), RHSiCl, where R indicates an alkyl radical with 1 to 6 carbon atoms, a indicates the values 1, 2 or 3, b indicates the values 0 or 1, c indicates the values 1, 2, 3 or 4, d indicates the values 0, 1 or 2 and e indicates the values 0, 1 or 2, are reacted in the presence of an aluminum oxide catalyst comprising 1 to 10 parts by weight of aluminum chloride and 0.5 to 10 parts by weight of a metal oxide selected from magnesium oxide, copper oxide, zinc oxide and mixtures thereof to 100 parts by weight of aluminum oxide.

Method for preparing alkyl chlorosilanes through rearrangement reactions

High boiling residue from the direct synthesis of alkylchlorosilanes are converted in large part to monosilanes by heating the residue by passage of alternating current in a pressurized reactor.

Method for producing alkyl chlorosilanes from the residues of the direct synthesis of alkyl chlorosilanes

The invention relates to a process for preparing alkylchlorosilanes from the liquid constituents of the residues from the direct synthesis of alkylchlorosilanes which have a boiling point of above 70&deg; C. at 1013 hPa and comprise disilanes, in which the residues are heated with hydrogen chloride and silicon at temperatures of at least 300&deg; C., with at least 10% by weight of trichlorosilane and/or tetrachlorosilane, based on the weight of the alkylchlorosilanes formed, being formed at the same time.

Process for working up residues from the direct synthesis of organochlorosilanes

The invention relates to a process for cleavage of chlorohydrocarbons which are present as an impurity in organochlorosilanes, in which the chlorohydrocarbons are brought into contact with steel surfaces which comprise nickel as an alloying constituent, and are cleaved into olefins and hydrogen chloride.

Process for the removal of chlorohydrocarbons from organochlorosilanes

This invention relates to a process for working up the alcohol-containing wastewater which is obtained in the hydrolysis of silanes of the general formula I

Growing community of inventors

Burghausen, Germany

Konrad Mautner