双外推法研究Zn(Ac)_2.2H_2O失水过程的动力学机理

A Study on the Kinetic Mechanism of Zn(Ac) 2.2H 2O Dehydration by Double Extrapolate Method

用热分析技术对Ｚｎ（Ａｃ）２．２Ｈ２Ｏ的失水过程进行研究，证明为一步失水过程．在Ｃｏａｔｓ－Ｒｅｄｆｅｒｎ积分式和Ｏｚａｗａ公式基础上，利用双外推方法，确定Ｚｎ（Ａｃ）２．２Ｈ２Ｏ失水过程的动力学机理为ｎ＝１．５的成核与生长过程，其机理函数积分式为Ｇ（α）＝［－ｌｎ（１－α）］１／１．５，并求得相应的动力学参数．

The dehydration of Zn(Ac) 2.2H 2O was investigated by using thermoanalysis techniques. The dehydration process includes one step only. On the basis of Coats Redfern’s integral equation and Ozawa’s equation, the kinetic mechanism was concluded to be nuclear producing and growing process ( n =1.5) by using double extrapolate method. The integral function of the mechanism of\ G(α)= ln (1 α) 1/1.5 and the corresponding kinetic parameters were determined.