反应压力对甲基氯硅烷合成过程的影响

实验研究了反应压力对甲基氯硅烷合成反应中反应速度和二甲基二氯硅烷(M2)选择性的影响. 结果表明，随着反应压力的升高，反应速度显著增加，硅粉的转换率基本不变，但是压力过高会导致M2选择性下降. 因此，实际生产中反应压力不宜太高，推荐在0.3 MPa以下操作. 通过实验还发现，反应压力波动对反应的影响是可逆的.

Effect of Reaction Pressure on Synthesis of Methylchlorosilane

The effect of reaction pressure on reaction activity and selectivity of dimethyldichlorosilane (DDS) in direct synthesis process has been investigated experimentally. The experimental results show that the reaction rate of this catalytic reaction increases with the increase of reaction pressure, with an almost constant silicon conversion. However,the selectivity of DDS will decline when pressure rises. This is brought by that the main and secondary reactions obey different reaction orders with regard to pressure. So high pressure is inadvisable and a pressure of below 0.3 MPa is recommended for practical production. The relation between reaction selectivity and operation pressure is regressed to predict the selectivity under the pressure range from 0.1 to 0.5 MPa. Furthermore, it was found in experiments that the influence of pressure fluctuation on the reaction performance is reversible. This demonstrates that the variation of pressure only changes the species concentration of gaseous phase and does not affect the properties of the contacted mass. Thus the pressure fluctuation in short time is reversible.