四氯化碳液相催化加氢反应动力学的研究

氯氟烃的生产工艺中 ,甲烷氯化生产甲烷氯化物是其中重要的一步 ,因此必然伴有大量的四氯化碳生成。由于氯氟烃和四氯化碳的臭氧破坏系数(ＯＤＰ)值比较高1] ,为了保护人类赖以生存的环境 ,根据“蒙特利尔公约”规定 ,我国目前已经禁止出口四氯化碳 ,对氯氟烃的出口也采取了许可证制度 ,并进行限制生产 ,准备逐步淘汰 ,因此对于大量四氯化碳和氯氟烃的处理成了人们普遍关注的一个重要问题。目前把大量的四氯化碳和氯氟烃转化为相应消耗臭氧指数较低的化合物则是比较现实的途径 ,选择性催化加氢脱氯就是其中一种有效的方法。四氯化碳催化加…

KINETIC STUDIES ON THE CATALYTIC HYDROGENATION OF CARBON TETRACHLORIDE TO CHLOROFORM IN LIQUID PHASE

Carbon tetrachloride is an ozone depleting chemical, while chloroform is not Therefore it is important for the catalytic hydrodechlorination of CCl 4 to CHCl 3 In this paper, kinetics on the catalytic hydrogenation of carbon tetrachloride to chloroform in liquid phase was studied A reaction mechanism was proposed Hydrogen molecular was activated on the surface of catalyst, the activated hydrogen atom then reacted with CCl 4 in the solution and produced CHCl 3 A definite kinetic equation could be deduced from the reaction mechanism The reaction rate constant is concerned with the intial concentration of CCl 4 in the solution, pressure, reaction temperature and the concentration of active center All these factors were investigated over Pt Pd/C catalyst and fit in with the kinetic equation The activation energy of the reaction is 86?KJ/mol according to the experimental results WT5H1]