高碘酸银钾合成宏观反应动力学

Kinetics of Potassium Diperiodatoargentate Synthesis Reaction

摘要: 建立了在强碱、强氧化条件下，由硝酸银合成高碘酸银钾的液固配合反应宏观动力学模型，推导了两种条件下的动力学方程式，并经实验验证。高碘酸根的初始浓度c0AL≤55.6 mmol/L时，反应为传质控制，动力学表达式为［1-(1-xB)1/2］·(1+110.7x1/2.04B)=t；当55.6 mmol/L≤c0AL≤139 mmol/L时，反应处于传质和反应阻力共存区，动力学表达式为100.6［1-(1-xB)1/2］·［1-(1-xB)1/1.51］=t。与实际数据相比较，两种情况下的动力学方程式均有良好的

Abstract: In the presence of strong alkali and oxidant, AgNO3 was coordinated with the ligand to form potassium diperiodatoargentate (DPA). Two simplified models were developed from the general kinetic model of the complex synthesis process for the mass transport control and the reaction rate control cases.The model simulation were in good agreements with the experimental data obtained from both the high and the low concentration systems.When the initial concentration of KIO4 was ≤55.6 mmol/L, the synthesis rate was primarily controlled by the mass transport step according to:［1-(1-xB)1/2］·(1+110.7x1/2.04B)=t; at a higher KIO4 initial concentration (55.6 mmol/L≤c0AL≤139 mmol/L), the rate was controlled by both the mass transport and reaction steps according to:100.6［1-(1-xB)1/2］·［1-(1-xB)1/1.51］=t.