METHOD FOR THE DIRECT SYNTHESIS OF ALKYLHALOGENOSILANES

摘要

An improved industrial method for the direct synthesis of alkylhalogenosilanes is described. Specifically, a method is described for preparing alkylhalogenosilanes by reacting, in a fluidizedbed reactor, and alkyl halogenide, preferably CH3Cl, with a solid body, which is referred to as a contact body and which includes powdered silicon and a catalytic system including at least one copper catalyst and β1 and β2 promoter activities.

主权项

1. A process for preparing alkylhalosilanes, the process comprising reacting an alkyl halide with a solid material, termed contact material, formed of silicon powder and a catalytic system comprising at least one copper-based catalyst and promoter additives β1 and β2 in a fluidized bed reactor, wherein the process further comprises:
a) introducing a first silicon Si1, having an aluminum content of 0.10 to 0.18 weight %, a calcium content of less than 0.2 weight %, and a phosphorus content of less than 50 weight ppm, and then b) introducing a second silicon Si2, alone or optionally in a mixture with Si1, having an aluminum content of 0.10 to 0.15 weight %, a calcium content of less than 0.2 weight %, and a phosphorus content of between 50 and 250 weight ppm.