论文部分内容阅读
在碱性介质中用分光光度法研究了二过碲酸合铜(Ⅲ)配离子(DTC)于25~40℃区间氧化1,2-丙二醇(Pr-diol)的反应动力学。结果表明,反应对DTC为一级,对Pr-diol的表现反应级数是1.1级。准一级速率常数kobs随[OH-]增大而增大,随[TeO42-]ex(外加的TeO42-离子浓度)的增加而减小,并且有负盐效应。在氮气保护下,反应能引发丙烯腈聚合。提出了含有自由基过程的反应机理,据此导出的速率方程圆满地解释了全部实验事实,并计算出速控步骤的速率常数及相应的活化参数。
The kinetics of the oxidation of 1, 2-propanediol (Pr-diol) by two over-tellurium (Ⅲ) complex ions (DTC) at 25-40 ℃ was studied spectrophotometrically in alkaline medium. The results showed that the response to DTC for the first grade, the performance of Pr-diol reaction grade is 1.1. The quasi-first order rate constant, kobs, increases with increasing [OH-], decreases with increasing [TeO42-] ex (plus TeO42- ion concentration), and has a negative salt effect. Under nitrogen, the reaction can initiate acrylonitrile polymerization. The reaction mechanism with the radical process was proposed. The rate equation derived from this method satisfactorily explained all the experimental facts and calculated the rate constants and corresponding activation parameters of the speed control step.