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为了获得一水合5-羟基间苯二甲酸钠(C8H4O5Na2.H2O)固态样品脱水过程的动力学三因子(反应级数n、表观活化能Ea、指前因子A)及相应的动力学方程,应用DSC技术获得化合物4个不同升温速率下的脱水过程曲线,利用多重扫描速率法,以“非模型等转化率法”为基础,采用9种积分法和微分法相结合的热分析动力学方法处理程序进行定量表征.结果显示C8H4O5Na2.H2O脱水阶段的反应为化学反应机理,表观活化能Ea为183.07kJ.mol-1,指前因子A为3.02×1018s-1,动力学方程为(dα/dT)=(3.02×1018)/β(1-α)2exp(-2.202×104/T).
In order to obtain the kinetic three factors (reaction order n, apparent activation energy Ea, pre-exponential factor A) and the corresponding kinetic equations for the dehydration process of solid samples of 5-hydroxyisophthalic acid monohydrate (C8H4O5Na2.H2O) DSC method was used to obtain the curves of dehydration under four different heating rates. Based on the multi-scan rate method and the “non-model conversion method”, nine kinds of integration and differential methods were used to analyze the dehydration process. The results showed that the reaction mechanism of C8H4O5Na2.H2O dehydration was chemical reaction mechanism, the apparent activation energy Ea was 183.07 kJ · mol-1, the pre-exponential factor A was 3.02 × 1018s-1 and the kinetic equation was (dα /dT)(.02.02×1018)/β(1-α)2exp(-2.202 × 104/T).