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在搅拌床反应器中使用铜基催化剂(辅以少量Zn,Sn,P助剂)催化硅粉与氯甲烷反应合成甲基氯硅烷,考察了温度、压力和催化剂用量对反应速率和产物选择性的影响.结果表明,在温度320℃、压力0.1MPa条件下,平稳期的催化反应速率可达210g/(kg?h),二甲基二氯硅烷的选择性可达87.7%;升高温度可大幅提高反应速率,但超过330℃会显著降低反应选择性;压力在0.3MPa以下反应速率对氯甲烷近似为一级反应,选择性受压力影响较小;一定范围内增加催化剂用量可提高速率,但会缩短反应平稳期,造成硅粉利用效率下降.
In a stirred bed reactor using copper-based catalyst (supplemented by a small amount of Zn, Sn, P promoter) catalytic silica fume and methyl chloride synthesis methylchlorosilane, investigated the temperature, pressure and catalyst dosage on the reaction rate and product selectivity The results showed that the catalytic reaction rate was 210g / (kg? H) at steady state and the selectivity of dimethyldichlorosilane was 87.7% at the temperature of 320 ℃ and the pressure of 0.1MPa. The increase of temperature Can significantly improve the reaction rate, but more than 330 ℃ will significantly reduce the reaction selectivity; pressure below 0.3MPa reaction rate of approximately a first-order reaction of methyl chloride, selectivity less affected by pressure; within a certain range to increase the amount of catalyst can increase the rate , But will shorten the reaction period, resulting in decreased utilization efficiency of silicon powder.