摘要
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。
A g-s-s catalytic reaction——synthesis of dimethyl dichlorosilane (DDS) from silicon and methane chloride with catalyst CuCl was studied in a f 24 experimental apparatus. The experimental results show that there is an initiation period before the reaction reached steady stage. The synthesis process should be performed below 300℃ in order to get higher reactivity and higher DDS selectivity. The reaction rate can be as high as 70gCH3Cl?kgSi)-1hr-1, and the selectivity of DDS is about 90%. Since the reaction activity and DDS selectivity in the fluidized bed reactor can be higher than that in the fixed bed reactor, the fluidized bed reactor is a suitable reactor type for this process. The SEM picture of silicon surface revealed that silicon has discrete activity sites where silane is produced. Phenomena observed in this experiment can be explained according to the g-s-s catalytic mechanism of this reaction.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2002年第3期287-292,共6页
Journal of Chemical Engineering of Chinese Universities
