一种新的热分析动力学处理方法

A new method for non-isothermal analysis kinetic treatment

用一种新的方法对一水草酸钙(CaC2O4·H2O)脱水反应的热分析动力学三因子,即活化能Ea、指前因子A和反应机理函数f(α)进行了求取.此方法可分为三步:(1)用迭代的方法求取Ea值;(2)用Popescu的方法求取反应的f(α);(3)由以上两步所得的结果求取指前因子A.此方法有两大优点:对动力学参数Ea和f(α)分别进行求取,从而使f(α)求取的准确性不因Ea值求取是否存在误差而受影响;在f(α)的求取中没有引入任何积分误差,从而提高了计算结果的准确性.

The paper was described a new method of investigating the knetics and mechanism of the calcium oxalate dehydration reaction. The method could be divided into three steps: (1) an iterative procedure has been established to obtain the value of activation of a reaction. (2) The Popescu method has been used to get the value of mechanism of reaction f(α).(3) According to the result of the former two steps, the preexponential factor A could be obtained. The main advantages of this method were: the computation of the activation energy and mechanism separated and no influence existed between them; no any assumption concerning the temperature integral and a higher degree of precision to the results.