PROCESS FOR DIRECT SYNTHESIS OF DIMETHYLDICHLOROSILANE AND CATALYST CONTAINING ALKALI EARTH METALS SELECTED FROM CALCIUM, MAGNESIUM AND BERYLLIUM AS ADDITIVE

摘要

The present invention relates to a method of manufacture of dimethyldichlorosilane, by reaction of methylene chloride in a mass of solid contact formed of silicon and of a catalyst comprising copper or a compound of copper, said method being characterizes in that the catalyst also comprises between about 10 and 1000ppm (calculated in and or antimony, tin metal) of a metal chosen from tin and antimony, or a compound of tin and antimony and between about 0,01 and 2 (calculated by weight of metal) of an additive metal chosen from beryllium, the magnesium and calcium or of a compound of these three metals, with respect to the contact mass which is solid silicon and catalyst. / p & & p & for the implementation of the process of the invention, the suitable improved, the degree of conversion of silicon and the maximum selectivity of dimethyldichlorosilane.