摘要
在干燥的氩气氛中,于363K下缓慢混合等摩尔的氯化1-甲基-3-丁基咪唑(BMIC)和高纯无水ZnCl2,得到了无色透明的离子液体BMIC/ZnCl2.在298.15K下,用具有恒温环境的溶解反应热量计测定了不同浓度离子液体BMIC/ZnCl2在水中的溶解焓,依据Pitzer方程拟合得到它们的标准摩尔溶解焓ΔsHm0和Pitzer溶解焓参数.利用标准摩尔溶解焓估算了离子液体的水化焓.
A colorless and transparent ionic liquid BMIC/ZnCl2 was prepared by mixing 1-butyl 3-methylimidazolium chloride（BMIC） and ZnCl2 with a molar ratio of 1：1 at 363.15 K under stirring in a glove box filled with dry argon. The molar dissolution enthalpies, A,Hm, of BMIC/ZnCl2 in water with various molalities were determined by a solution-reaction isoperibol calorimeter at 298. 15 K. In terms of Pitzer electrolyte solution theory, the molar solution enthalpy of BMIC/ZnCl2 at infinite dilution, △8Hm^0, and Pitzer parameters：βMX^（0）L βMX^（1）L and CMX^ФL were obtained respectively. According to Lecocq＇s viewpoint, ionic liquid BMIC/ZnCl2 with a MX molar ratio of 1 ： 1 is a single compound BMIZnCl3. In terms of Glasser＇s theory and thermodynamic cycle, the standard molar hydration enthalpy of ionic hquid BMIZnCl3, （ △H＋^0 ＋ △H-^0 ） = - 497 kJ/mol, was calculated. The standard molar enthalpies of hydration of individual ions can be obtained from those of electrolytes, provided that the value of one ion is known. The standard molar enthalpies of hydration of cation BMI^＋ were estimated △H＋^0 （ BMI^＋ ） = - 225 kJ/mol in literature so that the standard molar enthalpies of hydration of ZnCl3^- was obtained, that is, △H-^0 （ZnCl3^-） = - 272 kJ/mol.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第3期492-495,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20473036)资助
关键词
恒温环境热量计
溶解焓
PITZER方程
离子液体
水化焓
Isoperibol calorimeter
Solution enthalpy
Pitzer＇s equationy
Ionic liquid
Hydration enthalpy
