Process for manufacturing active silicon powder for the preparation of alkyl or aryle halogenosilanes

摘要

Preparation of active silicon powder for use in the Rochow reaction is claimed, in which metallurgical Si, containing more than 98% of Si, up to 0.4% Fe, up to 0.2% Al and up to 0.2% Ca, is milled to a particle size of less than 350 microns in the presence of at least one catalyst and/or promoter of the reaction.The operation is carried out so as to distribute the element(s) on the surface of the particles. Also claimed, is the activated Si powder , having a surface coating of catalytic elements.