有机硅高低沸物催化裂解歧化制备二甲基二氯硅烷

利用直接法合成甲基氯硅烷单体过程中所产生的大量有机硅高沸点和低沸点副产物为原料，研究了用催化裂解歧化的方法使之转化为有价值的甲基氯硅烷单体；比较了几种催化剂的催化性能，并得出了如下最佳工艺条件：用活性炭和γ-Al2O3作为催化剂组合成二段式催化反应，在一定量催化剂作用下，高沸物和低沸物的配比为1：1（体积比），反应压力（0．1-0．2）MPa，反应温度约633K。在上述条件下高沸物的裂解率可达75．1％，单体总收率达76．1％，二甲基二氯硅烷的收率为38．3％。

PRODUCTION OF DIMETHYLDICHLOROSILICANE FROM THE HIGH-BOILING AND LOW-BOILING COMPONENTS OF SILICANE BY CATALYTIC DECOMPOSITION AND DISPROPORTIONATION

In the production of methylchlorosilane by the direct synthesis(Muller-Rochow method),there is a large amount of by-products such as high-boiling components and low-boiling components to be produced.The conversion of these components to valuable methylchlorosilanes by catalytic decomposition and disproportionation is studied.The catalytic activities of different kinds of catalysts are shown.The optimum reaction condition is found as follows: the volume ratio of the high-boiling component to the low-boiling component is 1:1,the reaction pressure 0.1-0.2 MPa,and the reaction temperature,633K.Under the optimum condition,the conversion of the high-boiling component reaches 75.1%,the total yield of methylchlorosilane is 76.1%,and the yield of dimethyldichlorosilane gets 38.3%.