氯化1-羧甲基-3-甲基咪唑的热稳定性、平衡蒸汽压和升华焓

Thermal Stability,Equilibrium Vapor Pressure and Enthalpy of Sublimation of 1-Carboxymethyl-3-methylimidazolium Chloride

利用非等温、等温热重分析法（TG）,研究了高纯氮气气氛下氯化1-羧甲基-3-甲基咪唑（[cmmim]Cl）的热稳定性、平衡蒸汽压和标准升华焓.非等温TG曲线表明[cmmim]Cl的初始分解温度和最大分解速率对应的温度分别为547和570 K.然而长期等温TG研究表明,[cmmim]Cl的最高可使用温度约为433 K.另外,利用基于TG的蒸发技术研究了[cmmim]Cl的平衡蒸汽压与温度的关系并计算了标准升华焓.在403~463 K温度范围内,平衡蒸汽压和温度的关系是：lgPe=（9.8±0.2）＋（-2.88±0.09）×103/T.

Thermal stability,equilibrium vapor pressure,and standard enthalpy of sublimation of 1-carboxymethyl-3-methylimidazolium chloride（Cl） are investigated using both non-isothermal and isothermal thermogravimetric analysis under high purity nitrogen.The non-isothermal TG curve shows that the onset and peak decomposition temperature are 547 and 570 K,respectively.However,the long-term isothermal TG studies reveal that the highest application temperature for Cl is 433 K.Moreover,the temperature dependence of equilibrium vapor pressure and standard enthalpy of sublimation of Cl are also investigaged by TG-based transpiration.In the temperature range of 403-463 K,the relationship between temperature and equilibrium vapor pressure is lg pe=（9.8±0.2）＋（-2.88±0.09）×103/T.