The process for cleaving the heavy by-products derived from the synthesis of alkylchlorosilanes, in particular C.sub.1 to C.sub.6 alkylchlorosilanes, more particularly methylchlorosilanes, in particular for the cleavage of alkylchlorodisilanes, in particular methylchlorodisilanes having from one to five chlorine atoms, is carried out by treatment with hydrochloric acid in the presence of a catalytic system which comprises at least one metal phosphate, preferably associated with a basic impregnation compound. The metal phosphate may in particular correspond to the formula: M(XPO.sub.4).sub.y in which M represents a metal chosen from: monovalent metals, in which case X is 2H and y=1 divalent metals, in which case X is H and y=1 trivalent metals, in which case X is absent and y=1 tetravalent metals, in which case X is: H and y=2 pentavalent metals, in which case X is 0 and y=1.
从合成烷基
氯硅烷的重质副产物中裂解的过程,特别是C.sub.1至C.sub.6烷基
氯硅烷,更特别是
甲基氯硅烷的裂解,特别是用于裂解具有一到五个
氯原子的烷基
氯二
硅烷,通过在催化体系的存在下用氢
氯酸处理来进行。该催化体系包括至少一种
金属
磷酸盐,优选与碱性浸渍化合物结合。
金属
磷酸盐可以特别对应于以下公式:M(XPO.sub.4).sub.y,其中M表示所选
金属:一价
金属,此时X为2H且y=1;二价
金属,此时X为H且y=1;三价
金属,此时X不存在且y=1;四价
金属,此时X为H且y=2;五价
金属,此时X为0且y=1。