Process and catalyst with cesium as additive for the direct synthesis of dimethyldichlorosilane

摘要

1. Process for the manufacture of dimethyldichlorosilane by reaction of methyl chloride with a solid contact reactant formed of silicon and a catalyst comprising copper or a copper compound, the said process being characterized in that the catalyst additionally comprises between 30 and 1,000 ppm of at least one metal chosen from tin and antimony (calculated as tin and/or antimony metal) or of a tin and/or antimony compound and between 0.05 and 4% (calculated as caesium metal) of caesium or of a caesium compound, based on the mass of contact solid.