1,2-二氯乙烷氧氯化制四氯乙烯反应研究

摘要

Reaction thermodynamic analysis of preparing perchloroethylene through the oxychlorination of 1,2-dichloroethane and oxygen and hydrogen chloride was obtained.Experiments was carried out to evaluate the effect of different reaction parameters such as temperature,space velocity,the ratio of HCl to EDC and of O2 to EDC on the results of oxychlorination under the direct role of Deacon reaction catalyst.Thermodynamic analysis show that the reaction of producing perchloroethylene is a exothermic reaction which can happen spontaneously with high conversion,and can be promoted by decreasing temperature.The experimental results show that 99.2％ conversion of EDC,86.23％ selectivity of perchloroethylene can be obtained at 410℃ with 0.54 h-1 of mass hourly space velocity of EDC,2.76 of the molar ratio of HCl to EDC,and 1.97 of the moral ratio of O2 to EDC.%对1,2-二氯乙烷、氧气、氯化氢氧氯化制四氯乙烯反应体系进行了热力学分析,并通过实验考察了在Deacon反应催化剂的直接作用下,反应温度、反应空速、氧气及氯化氢与1,2-二氯乙烷间的物质的量比对反应结果的影响.热力学分析表明,生成四氯乙烯总反应为自发向右进行较完全的放热反应,适当降低温度有利于反应的进行.实验结果表明,较佳工艺条件为:反应温度410℃,空速0.54h-1,氯化氢、氧气和1,2-二氯乙烷三者的物质的量比2.76:1.97:1.在此条件下反应,1,2-二氯乙烷的转化率为99.20％,四氯乙烯的选择性可达到86.23％.