过氧化氢氧化苯酚反应机理及动力学

Kinetics and Mechanism of Oxidation Reaction of Phenol by Hydrogen Pefoxide

测定了均相体系中过氧化氢氧化苯酚反应产物的初始生成速率。经动力学分析验证了其反应机理主要是自由基机理,并确定了其中的控制步骤,得到了实验条件下的邻/对苯二酚的初始生成速率方程。从实验结果及所得到的速率方程可知,邻/对苯二酚初始生成速率与各反应物的初始浓度成正比关系,且邻苯二酚初始生成速率是对苯二酚初始生成速率的2倍。

The free-radical reaction mechanism of the catalytic hydroxylation of phenol to dihydroxybenzene was verified by the experiments of measuring initial generation rates of pyrocatechol and hydroquinone in a homogenous syetem. The control items of reaction rates were determined and the initial rates equation of pyrocatechol and hydroquinone were obtained. On this basis,it was found that the initial rates of pyrocatechol and hydroquinone were directly proportional to initial concentration of the phenol, hydrogen peroxide and iron ion catalyst and that the generation rate of pyrocatechol was two times of that of hydroquinone.