间甲酚臭氧化反应动力学研究  

Study on Kinetics of Ozonation of m-Cremol

作　　者：李小莹[1] 黎永津[1] 沈慧芳[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《广东化工》2008年第6期3-6,共4页Guangdong Chemical Industry

摘　　要：采用停流光谱仪研究了在T=298 K,pH=3～7范围内溶解臭氧与间甲酚在水溶液中的臭氧化反应动力学,初步探讨了间甲酚臭氧化反应的机理。实验结果表明,间甲酚臭氧化总的反应是二级,对臭氧浓度和间甲酚浓度分别为一级。臭氧化反应速率常数随溶液pH的增大而增大,在T=298 K时,当pH从3变化到7,总的反应速率常数从6.28×103(mol/L)-1s-1增大到9.15×105(mol/L)-1s-1。A stopped-flow spectrophotometer system was applied to study the kinetics of the ozonation between dissolved ozone and m-cremol in aqueous solution under the condition T=298 K and pH varying from 3 to 7. The reaction mechanism of m-cresol ozonation was discussed briefly. The overall ozonation reaction of m-cremol was found to be second order with first order in each reactant concentration. The ozonation rate constant of m-cremol increased rapidly with the solution pH in the range of 3 to 7 investigated. With a fixed concentration（0.001 M） of m-cremol, as the pH increased from 3 to 7, the overall rate constant increased from 6.28× 10^3 （mol/L）-1·s^-1 to 9.15×10^5 （mol/L）-1·s^-1 at 298 K.

关 键 词：臭氧化 间甲酚 动力学 反应速率常数 反应机理 

分 类 号：TQ243.12[化学工程—有机化工] O646.5[理学—物理化学]