| 摘要 |
A process for the preparation of an organohalosilane of the general formula: X4-nSiRn in which, R represents a methyl, ethyl, n-propylisopropyl, n-butyl, isobutyl, phenyl or a tolyl functional group; X represents chlorine or bromine; and n is 1, 2 or 3, is disclosed. The process takes place by reacting an SiO2-containing material with a hydrocarbon halide of the general formula RX, in which R and X are defined as above. The reaction between the SiO2-containing material and RX takes place in the presence of iron powder and either: (a) carbon and a catalyst, in which the SiO2-containing material, the iron powder, the carbon and the catalyst are subjected to a heat treatment at 800 DEG to 1400 DEG C. prior to the reaction with RX or (b) an aluminum trihalide and/or boron trihalide in which the halogen is either chlorine or bromine. Alternative (b) may be carried out in the presence of a catalyst. The organohalosilanes of the invention are useful, for example, as starting materials for the preparation of organopolysiloxanes and as starting materials for the preparation of SiC produced in the gas phase. |
