Particle size distribution for wet bed processes for the production of alkyl halosilanes

摘要

The process for the mfr. of alkylhalosilanes of formula (I) comprises contacting an alkyl halide of formula (II) with a fluidised bed of particulate Si at 250-350 (270-320) deg.C in the presence of a catalyst compsn. which includes Cu. The novelty is that the Si particles are within a range of 1-85 microns, and pref. have a particle size mass distribution characterised by a 10th percentile of 2.1-6 (2.5-4.5) microns; a 50th percentile of 10-25 (12-25) microns; and a 90th percentile of 30-60 (35-45) microns. RaHbSiX4-a-b (I) RX (II) R is 1-4C alkyl; X is halogen; a is 1, 2, 3 or 4; b is 0, 1 or 2; provided a+b is 1, 2, 3 or 4.