Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnall...Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnallite had been dehydrated to some extent at 160℃ for 4h.The dehydrated ammonium carnallite was dissolved in methanol under low temperature by feeding ammonia,preparing ammoniation magnesium chloride.The kinetics of non-isothermal decomposition was studied for ammoniation magnesium chloride.The process of ammoniation magnesium chloride to eliminate ammonia in the temperature range 78～246℃ can be described by the model of Ginstling-Brounshtein {f(α)=1.5[(1-α)-1/3-1]-1,g(α)=(1-2α/3)-(1-α)2/3}.The kinetic equation is dα/dt= 1.5Ae-E/RT [(1-α)-1/3-1]-1.The processes of ammoniation magnesium chloride to eliminate ammonia within 246～299℃ can be described by the model of Zhuralev,Lesoki and Tempelman {f(α)= 1.5(1-α)4/3[(1-α)-1/3-1]-1,g(α)= [(1-α)-1/3-1]2}.The kinetic equation is dα/dt= 1.5Ae-E/RT(1-α)4/3[(1-α)-1/3-1]-1.The kinetics equations and parameters provided valuable data for ammonition magnesium chloride to produced anhydrous magnesium chloride.展开更多
文摘为提高2,6-二氨基-3,5-二硝基吡啶^(-1)-氧化物(ANPyO)Pb(Ⅱ)(Pb-ANPyO)含能配合物能量水平,获得安全性能和热分解特性参数。以ANPy O和醋酸铅为原料,N,N-二甲基甲酰胺(DMF)为溶剂,合成了ANPy OPb(Ⅱ)含能配合物。采用红外光谱(FTIR),元素分析和X射线光电子能谱分析(XPS)表征其结构,测试了其撞击感度和摩擦感度,采用差热分析-热重法(DSC-TG)研究其在不同升温速率下的热分解行为,利用Kissinger公式,Ozawa公式,热力学关系式和Zhang-Hu-Xie-Li公式分别计算了配合物热分解反应的表观活化能和热力学参数,以及配合物的热安全性参数。结果表明,配合物分子式为Pb(C5H3N5O5),特性落高和摩擦感度分别为238 cm和0。配合物在25~500℃范围内的热分解过程由一个吸热熔融峰和一个分解放热峰组成,相应峰温分别为265.0℃和332.6℃。用Kissinger法和Ozawa法所得配合物放热分解反应的活化能分别为202.42 k J·mol^(-1)和197.40 k J·mol^(-1),放热分解反应的活化熵,活化焓和活化自由能分别为149.5 J·mol^(-1)·K^(-1),197.7 k J·mol^(-1),112.1 kJ·mol^(-1),热爆炸临界温度和自加速分解温度分别为586.6 K和572.4 K。
文摘Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnallite had been dehydrated to some extent at 160℃ for 4h.The dehydrated ammonium carnallite was dissolved in methanol under low temperature by feeding ammonia,preparing ammoniation magnesium chloride.The kinetics of non-isothermal decomposition was studied for ammoniation magnesium chloride.The process of ammoniation magnesium chloride to eliminate ammonia in the temperature range 78～246℃ can be described by the model of Ginstling-Brounshtein {f(α)=1.5[(1-α)-1/3-1]-1,g(α)=(1-2α/3)-(1-α)2/3}.The kinetic equation is dα/dt= 1.5Ae-E/RT [(1-α)-1/3-1]-1.The processes of ammoniation magnesium chloride to eliminate ammonia within 246～299℃ can be described by the model of Zhuralev,Lesoki and Tempelman {f(α)= 1.5(1-α)4/3[(1-α)-1/3-1]-1,g(α)= [(1-α)-1/3-1]2}.The kinetic equation is dα/dt= 1.5Ae-E/RT(1-α)4/3[(1-α)-1/3-1]-1.The kinetics equations and parameters provided valuable data for ammonition magnesium chloride to produced anhydrous magnesium chloride.
基金National Natural Science Foundation of China(No.20803058)Foundation of National Key Lab on Combustion Technology(No.9140A28020308BQ3402)Science and Technology Foundation of Northwest University(NG0908)
