Patent ID: 7307180

Claim:
A process for the preparation of a haloalkyldialkylchlorosilane of formula (I): Hal-(R 2 R 3 )Si—(CH 2 ) s -Hal by the hydrosilylation reaction of a reaction medium comprising a silane of formula (II): Hal-(R 2 R 3 )Si—H and an alkenyl halide of formula (III): CH 2 ═CH—(CH 2 ) s-2 Hal in the presence of a catalytically effective amount of a hydrosilylation catalyst based on iridium, in which formulae: the symbol Hal represents a halogen atom chosen from chlorine, bromine and iodine atoms, the symbols R 2 and R 3 , which are identical or different, each represent a monovalent hydrocarbon group chosen from a linear or branched alkyl radical having from 1 to 6 carbon atoms and a phenyl radical, and s represents an integer between 2 and 10 inclusive, wherein at the end of the hydrosilylation reaction, the product of formula (I) formed is recovered and the iridium is recovered, said iridium being found in its original form of catalyst or in a converted form, the recovery of said iridium taking place under the following conditions a), b) and c): a) the recovery of the iridium is carried out: 1. either directly on the reaction medium at the end of the reaction, 2. or on the liquid distillation residue, comprising the byproducts and the iridium or its derivatives, as is obtained after distillation of the reaction medium in order to separate therefrom the product of formula (I), b) the iridium is recovered by bringing the reaction medium or the distillation residue into contact with an effective amount of carbon black which adsorbs the iridium, and c) the carbon black is separated from the iridium for the purpose of recovering said iridium.