【摘要】 甲基三氯硅烷(M1)与低沸物(LBR)是工业上“直接法”生产二甲基二氯硅烷单体过程中产生的副产物,两者之间通过再分配反应可转化为高价值的有机硅单体。以活性炭为载体,采用浸渍蒸发煅烧法制备了负载型AlCl3固体酸催化剂,在固定床反应器中进行甲基三氯硅烷与低沸物的再分配反应,制得二甲基二氯硅烷和三甲基氯硅烷。考察了活性炭载体预处理方式及反应条件对再分配反应的影响。结果表明,经过高温扩孔处理的活性炭载体负载的AlCl3催化剂具有较好的反应活性;优化的反应条件为:W(M1/LBR)为2.0~3.0,反应温度为310℃,LHSV为1.5h-1;该催化剂的制备过程简单,催化反应条件温和且表现出良好的催化稳定性。更多还原

【Abstract】 Methyltrichlorosilane and low-boiling residues are byproducts in the direct synthesis process of dimethyldichlorosilane, and these two byproducts can be converted into more valuable methylchlorosilanes through redistribution technologies. In the experiments, the supported AlCl3 catalysts used for the redistribution reaction of methyltrichlorosilane and low-boiling residues in a fixed bed reactor to produce dimethyldichlorosilane and trimethylchlorosilane were prepared by using an impregnation-evaporation-alcination method. The pretreatment methods of activated carbon (AC), which is used as the catalyst support, and the reaction conditions affecting the redistribution reaction were experimentally investigated. It is found that the AlCl3 catalyst supported on the AC pretreated by high temperature will have a higher activity for the redistribution reaction. It is due to the high temperature pretreatment will enlarge the pore size of the AC and will increase its specific surface area. The optimum reaction conditions for the redistribution reaction were determined as follows: the mass ratio of methyltrichlorosilane to low-boiling residues is 2.0~3.0, the reaction temperature 310℃ and LHSV 1.5h?1. The AC supported AlCl3 catalyst requires only a mild reaction conditions and it shows a good catalytic stability in the redistribution reaction.更多还原