Abstract: 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 <15% and a concentration of compounds having a boiling point >71° C. of less than 25%, and evaporating this diluted mixture into a volatile product stream and an AlCl3-containing solid.

Abstract: 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 <15% and a concentration of compounds having a boiling point >71° C. of less than 25%, and evaporating this diluted mixture into a volatile product stream and an AlCl3— containing solid.

Abstract: The invention provides a continuous process for preparing alkylchlorosilanes from the residues of direct synthesis of alkylchlorosilanes which comprise liquid constituents with a boiling point of at least 70° C. at 1013 hPa and may also contain solids, with hydrogen chloride, by passing the residues at a temperature not above 200° C. and hydrogen chloride at a temperature higher than the latter into a reactor so that the resultant reaction temperature is from 400° C. to 800° C.

Abstract: The invention provides a continuous process for preparing alkylchlorosilanes from the residues of direct synthesis of alkylchlorosilanes which comprise liquid constituents with a boiling point of at least 70° C. at 1013 hPa and may also contain solids, with hydrogen chloride, by passing the residues at a temperature not above 200° C. and hydrogen chloride at a temperature higher than the latter into a reactor so that the resultant reaction temperature is from 400° C. to 800° C.

Abstract: A process for preparing silanes of the formula 1: RaSiHbCl4-a-b  (1) where R is methyl or ethyl, a is 0, 1, 2 or 3 and b is 0 or 1, from hydrogen chloride gas and reactants selected from among a) silicon metal, b) disilanes and oligosilanes whose radicals are selected from among H, R and Cl,  and mixtures thereof, wherein the hydrogen chloride gas is prepared from H2 and Cl2 in a concerted process.

Abstract: A process for preparing silanes of the formula 1:

Abstract: A continuous process for the direct synthesis of silanes of the formula

Abstract: A continuous process for the direct synthesis of silanes of the formula 1 RaSiCl4−a  (1) involves reacting finely divided silicon metal with R—Cl in a fluidized bed, where R is hydrogen, methyl or ethyl and a is 0, 1, 2, 3 or 4, where a product stream comprising gaseous silanes of the formula 1, further gaseous reaction products, unreacted RCl and silicon-containing dust is discharged from the fluidized bed, wherein at least part of the dust is introduced in the form of a suspension in a liquid selected from among liquid silanes of the formula 1, further liquid reaction products and mixtures thereof, into the fluidized bed.

Abstract: 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 CuCl2 using mineral acid and oxidant, where mineral acid or oxidant or mineral acid and oxidant contain chlorine, giving an aqueous CuCl2 solution, and in a second step, the aqueous CuCl2 solution is reduced to CuCl using elemental iron.

Abstract: 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 CuCl2 using mineral acid and oxidant, where mineral acid or oxidant or mineral acid and oxidant contain chlorine, giving an aqueous CuCl2 solution, and in a second step, the aqueous CuCl2 solution is reduced to CuCl using elemental iron.

Abstract: 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.

Abstract: The invention relates to a continuous process for the direct synthesis of methylchlorosilanes by reacting chloromethane with a catalyst composition comprising silicon, zinc promoter and copper catalyst which is selected from a) copper oxide, b) mixtures of at least 80% by weight of copper oxide and copper(I) chloride, c) copper(I) chloride and d) mixtures of at least 80% by weight of copper(I) chloride and copper oxide, where copper catalysts a), b), c) or d) are employed alternately in such a way that copper catalyst a) or b) is followed by c) or d), or copper catalyst c) or d) is followed by copper catalyst a) or b).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Alkylchlorosilanes are prepared continuously from the residue of direct synthesis of alkylchlorosilanes containing liquid constituents with a boiling point of at least 70.degree. C. at 1013 hPa and solid constituents, by heating the residue with hydrogen chloride at temperatures of from 300.degree. C. to 800.degree. C. in a tubular reactor with internals which can be rotated.

Abstract: In a process for the direct synthesis of methylchlorosilanes by reacting methyl chloride with a catalytic composition comprising silicon, copper catalyst and promoters, where at least some of the catalytic composition is comprised of the catalytic composition from a prior production campaign.

Abstract: Methylchlorosilanes are prepared by reaction of methyl chloride with silicon in the presence of a catalyst combination of copper oxide, zinc oxide and metallic antimony.

Abstract: Methylchlorosilanes are prepared from silicon and methyl chloride in the presence of a copper catalyst and optionally promoter substances, the production rates of the individual methylchlorosilanes, based on the surface area of the silicon employed, being controlled by the structural parameter QF of the silicon. The structural parameter QF is determined by(a) cutting up silicon test specimens to form a cut surface.(b) totaling on the cut surface the areas of the precipitates of intermetallic phases having a longitudinal shape to give an area number A,(c) totaling on the cut surface the areas of precipitates of intermetallic phases having a circular shape to give an area number B, and(d) obtaining the quotient of the area number A and the area number B, called the structural parameter QF.

Abstract: Finely divided copper powder suitable for the preparation of copper catalyst for the synthesis of methylchlorosilane is prepared by adding an aqueous copper salt solution to an aqueous suspension of iron powder. Copper salt solutions obtained as process residues from the synthesis of methylchlorosilane can be used in the process of this invention.