葡萄糖酸亚锡热分解动力学

Thermal Decomposition Kinetics of Stannous Gluconate

以葡萄糖酸内酯和氧化亚锡为原料,制备葡萄糖酸亚锡并研究其热行为.用红外光谱和元素分析法对产物进行了表征,推测出该化合物的分子式是Sn C6H10O7.用热重分析法（DTA-TGA）研究了葡萄糖酸亚锡在N2气氛中的热分解行为及动力学规律.用Flynn-Wall-Ozawa、Kissinger和stava-esta’k法对非等温动力学数据进行了分析.结果表明,热分解过程分为2个阶段,第1阶段热分解温度范围为373-603 K,积分表达式为g（α）=[-ln（1-α）]3;第2阶段热分解温度范围为603-733 K,积分表达式为g（α）=[-ln（1-α）]1/3,同时,得到分解过程的焓变、熵变和Gibbs自由能的变化量,为葡萄糖酸亚锡的工程设计、工业生产奠定基础.

Stannous gluconate was synthesized with D-Gluconic acid-δ-lactone and stannous oxide. It was characterized by FTIR techniques to speculate the formula（ Sn C6H10O7）. The thermal decomposition and non-isothermal decomposition kinetic of stannous gluconate was investigated by the Differential Thermal Analysis and Thermogravimetric Analysis in nitrogen atmosphere. The mechanism function and kinetic parameters were obtained by the Flynn-Wall-Ozawa,Kissinger and stava-esta＇k methods. The results showed that the thermal decomposition was divided into two stages,the thermal decomposition temperature range of first stage was 373 - 603 K,another was 603 - 733 K,the thermal decomposition methanism functions of them are Avrami-Erofeev equation,and the reaction orders（ n） are 3 and 1 /3,respectively. Moreover,the enthalpy change,entropy change and the change of Gibbs free energy were obtained,which can contribute to industrial production and application of stannous gluconate.