钛硅分子筛催化氯丙烯氯醇化制二氯丙醇反应的研究

STUDY OF CHLOROHYDRINATION OF ALLYL CHLORIDE TO DICHLOROPROPANOL CATALYZED BY TITANIUM SILICALITE

为解决传统方法制备二氯丙醇存在的环境污染严重、氯原子利用率低、反应条件苛刻等问题,采用盐酸作氯源,双氧水为氧化剂,空心钛硅分子筛HTS为催化剂,在温和的反应条件下催化氯丙烯发生氯醇化反应制备二氯丙醇,考察了催化剂种类、物料配比、温度、催化剂用量等反应条件对氯丙烯转化率及产物中二氯丙醇选择性的影响,并提出了可能的反应机理。结果表明:HTS分子筛催化剂对氯丙烯氯醇化反应具有良好的催化效果,盐酸与MFI型四配位骨架钛表面的环氧化反应中间体通过相互作用,促进氯丙烯高效转化为二氯丙醇。

Traditional methods of preparing dichloropropanol have many problems,such as serious environmental pollution,low utilization of chlorine atom and harsh reaction conditions.In this work,a new process for chlorohydrination of allyl chloride with H 2O 2 as the oxidant and HCl as the chlorine source in the presence of HTS zeolite was developed to produce dichloropropanol.The effects of catalyst type,material ratio,temperature and catalyst dosage on the conversion of allyl chloride and the selectivity of dichloropropanol in the product were investigated,and a reaction mechanism was proposed based on the results.HTS zeolite showed excellent performance in this catalytic chlorohydrination process and the reaction of HCl with the epoxidation intermediate on the surface of MFI-type tetracoordinated titanium was carried out by the interaction between HCl and HTS,and efficient conversion of allyl chloride to dichloropropanol.