甲基磺酸铜的脱水动力学

Dehydration Kinetics of Hydrated Cu(Ⅱ) Methanesulfonate

采用热重及差式扫描量热技术研究了在动态氮气气氛下甲基磺酸铜的脱水过程。结果表明,水合甲基磺酸铜含有4个结晶水,分两步失去。对不同升温速率(5,10,15,20℃/min)下Cu(CH3SO3)2.4H2O的脱水过程进行了非等温脱水动力学研究。采用求活化能和确定反应机理相分离的技术,分别得到两步脱水过程的活化能Ea1为114.46 kJ/mol,Ea2为90.08 kJ/mol,并确定了第一步脱水反应机理为R3,指前因子lg(A/min-1)为16.13。

The thermal dehydration process of Cu（ Ⅱ ） methanesulfonate was studied in dynamic nitrogen atmosphere using thermo gravimetry （^9TG） and differential scanning calorimeter （DSC） techniques. The results show that hydrated Cu（ Ⅱ ） methanesulfonate contains four molecules of crystallization water, which are dehydrated by two stages. Dehydration of tetrahydrate copper methanesulfonatein different heating rates （5, 10, 15, 20 ℃/min） were studied and dehydration kinetics was discussed by the programmed temperature method. Using the technique that determining mechanism was independent of computing activation energy, the activation energies of two stages dehydration were estimated. Eal is 114.46 kJ/mol and Ea2 is 90.08 kJ/mol, respectively. Additionally, the mechanism of the first stage dehydration is confimled, which obeys R3 mechanism, and the pre- exponential factor lg（A/min^-1） is 16.13.