Abstract: Process for preparing alkylhalosilanes are provided. The process involve reacting an alkyl halide with a solid body formed of silicon and a catalytic system.

Abstract: Process for preparing alkylhalosilanes are provided. The process involve reacting an alkyl halide with a solid body formed of silicon and a catalytic system.

Abstract: Process for the preparation of alkylhalosilanes by reaction of an alkyl halide, preferably CH3Cl, with a solid body, referred to as contact body, formed of silicon and of a catalytic system comprising (?) a copper catalyst and (?) a group of promoting additives comprising: an additive ?1 chosen from metallic zinc, a zinc-based compound and a mixture of these entities, an additive ?2 chosen from tin, a tin-based compound and a mixture of these entities, optionally an additive ?3 chosen from cesium, potassium, rubidium, a compound derived from these metals and a mixture of these entities, said direct synthesis process being characterized by the following points, taken in combination: the copper catalyst (?) is in the form of metallic copper. of a copper halide or of a mixture of these entities, the contact body additionally includes a supplementary promoting additive ?4 chosen from a derivative of an acid of phosphorus and a mixture of these entities.

Abstract: Process for the preparation of alkylhalosilanes by reaction of an alkyl halide, preferably CH3Cl, with a solid body, referred to as contact body, formed of silicon and of a catalytic system comprising (?) a copper catalyst and (?) a group of promoting additives comprising: an additive ?1 chosen from metallic zinc, a zinc-based compound and a mixture of these entities, an additive ?2 chosen from tin, a tin-based compound and a mixture of these entities, optionally an additive ?3 chosen from cesium, potassium, rubidium, a compound derived from these metals and a mixture of these entities, said direct synthesis process being characterized by the following points, taken in combination: the copper catalyst (?) is in the form of metallic copper. of a copper halide or of a mixture of these entities, the contact body additionally includes a supplementary promoting additive ?4 chosen from a derivative of an acid of phosphorus and a mixture of these entities.

Abstract: The alkylhalosilanes are directly synthesized while diminishing the formation of coke by reacting an alkyl halide with silicon in the presence of a catalytically effective amount of (?) a copper metal or a copper-based compound catalyst and (?) a catalyst promoter intermixture therefor which comprises an effective minor amount of an additive ?1 selected from the group consisting of tin, a tin-based compound and mixture thereof, optionally, an effective minor amount of an additive ?2 selected from the group consisting of zinc metal, a zinc-based compound and mixture thereof, an effective minor amount of an additive ?3 selected from the group consisting of cesium, potassium and rubidium, and compound and mixture thereof, and, optionally, an effective minor amount of an additive ?4 selected from the group consisting of the element phosphorus, a phosphorus-based compound and mixture thereof.

Abstract: The alkylhalosilanes are directly synthesized by reacting an alkyl halide with silicon in the presence of a catalytically effective amount of (?) a copper metal or a copper-based compound catalyst and (?) a catalyst promoter intermixture therefor which comprises an effective minor amount of an additive ?1 selected from the group consisting of tin, a tin-based compound and mixture thereof, an effective minor amount of an additive ?2 selected from the group consisting of cesium, potassium and rubidium, and compound and mixture thereof, and an effective minor amount of an additive ?3 selected from the group consisting of the element phosphorus, a phosphorus-based compound and mixture thereof.

Abstract: The alkylhalosilanes are directly synthesized by reacting an alkyl halide with silicon in the presence of a catalytically effective amount of (?) a copper metal or a copper-based compound catalyst and (?) a catalyst promoter intermixture therefor which comprises an effective minor amount of an additive ?1 selected from the group consisting of tin, a tin-based compound and mixture thereof, an effective minor amount of an additive ?2 selected from the group consisting of cesium, potassium and rubidium, and compound and mixture thereof, and an effective minor amount of an additive ?3 selected from the group consisting of the element phosphorus, a phosphorus-based compound and mixture thereof.

Abstract: The alkylhalosilanes are directly synthesized while diminishing the formation of coke by reacting an alkyl halide with silicon in the presence of a catalytically effective amount of (?) a copper metal or a copper-based compound catalyst and (?) a catalyst promoter intermixture therefor which comprises an effective minor amount of an additive ?1 selected from the group consisting of tin, a tin-based compound and mixture thereof, optionally, an effective minor amount of an additive ?2 selected from the group consisting of zinc metal, a zinc-based compound and mixture thereof, an effective minor amount of an additive ?3 selected from the group consisting of cesium, potassium and rubidium, and compound and mixture thereof, and, optionally, an effective minor amount of an additive ?4 selected from the group consisting of the element phosphorus, a phosphorus-based compound and mixture thereof.

Abstract: The invention concerns the upgrading of a by-product of direct synthesis, namely MeSiCl3, by vapor phase catalytic hydrogenation of said by-product to obtain MeHSiCl2 with greater added value. The invention concerns a method for preparing MeHSiCl2 by catalytic hydrogenation of MeSiCl3 in the presence of a metal catalyst with high selectivity levels in MeHSiCl2 economically and without having recourse to drastic and industrially unsuitable conditions. The invention uses a catalyst comprising a bimetal ruthenium/tin catalytic agent. Said catalytic agent is obtained by reacting ruthenium chloride and tin chloride in an acid medium. In practice, the catalyst is formed by a silica powder support impregnated by the ruthenium/tin catalytic agent.

Abstract: The invention concerns a method for preparing hydrogenated alkylmonosilanes, by catalytic hydrogenolysis, under hydrogen pressure, of halogenoorganopolysilanes, improving known methods, in particular by facilitating implementation, and in terms of cost-effectiveness and performance which are shown by the efficiency of the resulting hydrogenated monosilanes. In said method the starting polysilanes are of the type: (CH3)Cl2Si—SiCl(CH3)2; (CH3)Cl2Si—SiCl2(CH3); (CH3)Cl2Si—Si(CH3)3; (CH3)2ClSi—SiCl(CH3)2; (CH3)Cl2Si—SiCl(Ch3)—SiCl2(CH3); (CH3)Cl2Si—Si(CH3)(SiCH3Cl2)—SiCl2CH3. The hydrogenated monosilanes CH3H2ClSi; (CH3)2HClSi; CH3HCl2Si are obtained by contacting said polysilanes with gaseous hydrogen under pressure, in the presence of a catalytic system AB comprising a hydrogenation catalyst precursor A and an auxiliary B for dissolving precursor A in the reaction medium. Said catalytic system is further characterized in that it is reductant-free.

Abstract: The invention concerns a method for obtaining alkylmonohydrogenohalogenosilanes (AHHS), for example Me2HSiCl.Said AHHS are prepared by redistribution from MeHSiCl2 and Me3HSiCl in the presence of a catalyst such as AlCl3, which can start a parasitic disproportionation which affects the AHHS produced. In order to avoid this, the method consists in using an inhibitor which neutralizes AlCl3 after redistribution, The problem which still prevails and on which the present invention is based is related to the fact that during distillation, which aims at separating the required AHHS, the latter are again subjected to the parasitic disproportionation.

Abstract: A redistribution reaction between organohydrochlorosilanes and optionally chlorinated organosilanes is run in the presence of a catalyst in the solid state which comprises an alumina with an alkali metal or alkaline earth metal content expressed in ppm of the corresponding oxides of less than or equal to 500 ppm.

Abstract: Improved method for obtaining organosilanes comprising: a redistribution reaction between a chlorinated organohydrogenosilane and an organo-substituted and optionally chlorinated silane, the distribution reaction taking place in the presence of a sufficient amount of a catalyst consisting of a Lewis acid of formula (3) M(X).sub.d in which: M represents a metal selected among Ti, Fe, Cu, Ag, Zn, Cd, Hg, Al, Ga, In, B, Sn, Pb, Sb, and Bi; X represents a halogen atom; d represents the valency of metal M; and separation by distillation of the chlorinated organohydrogenosilane produced by redistribution; the said method being characterized in that, after redistribution, a redistribution catalyst inhibiting compound is used. This catalyst is selected among the fluid polyorganosiloxanes (POS) having a viscosity at 25.degree. C. not exceeding 5000 mPa.cndot.

Abstract: An improved redistribution reaction for the preparation of organosilanes wherein a silane or silicone resin is added after the reaction to inhibit the catalyst.