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在f 24mm的实验室流化床装置上,对金属硅与氯甲烷在CuCl催化剂作用下直接合成二甲基二氯硅烷(DDS)的气-固-固相催化反应进行了实验研究。结果表明,为获得较高的DDS选择性,反应应在300℃以下进行,实验测得反应速率达到70gCH3Cl(kgSi)-1h-1,主副反应的活化能分别为92kJmol-1和254kJmol-1。将流化床实验的结果与固定床实验结果进行了对比,流化床反应器在反应活性和DDS选择性上均远优于固定床,是最适用于有机硅单体合成的反应器型式。根据文献资料和气-固-固催化反应机理对实验中观察到的现象进行了解释。
The gas-solid-solid catalytic reaction of direct synthesis of dimethyldichlorosilane (DDS) between silicon metal and methyl chloride under CuCl catalyst was carried out on f 24mm laboratory fluidized bed reactor. The results show that the reaction should be carried out below 300 ℃ in order to obtain higher DDS selectivity. The reaction rate is 70g CH 3 Cl (kgSi) -1h-1. The activation energies of main and side reactions are 92kJ mol -1 and 254kJ mol -1 respectively . The results of fluidized bed experiments are compared with those of fixed bed experiments. The fluidized bed reactor is far superior to fixed bed in reactivity and DDS selectivity. It is the most suitable reactor type for synthesizing organic silicon monomer. The phenomena observed in the experiment were explained according to the literature and the gas-solid-solid catalysis reaction mechanism.