物理化学学报 >> 2004, Vol. 20 >> Issue (12): 1469-1471.doi: 10.3866/PKU.WHXB20041214

研究简报 上一篇    下一篇

室温离子液体EMIES的标准生成焓

张志恒; 关伟; 杨家振; 谭志诚; 孙立贤   

  1. 辽宁大学化学院,沈阳 110036; 中国科学院大连化学物理研究所,大连 116023
  • 收稿日期:2004-04-02 修回日期:2004-07-27 发布日期:2004-12-15
  • 通讯作者: 杨家振 E-mail:jzyanglnu@yahoo.com.cn

The Standard Molar Enthalpy of Formation of Room Temperature Ionic Liquid EMIES

Zhang Zhi-Heng; Guan Wei; Yang Jia-Zhen; Tan Zhi-Cheng; Sun Li-Xian   

  1. Department of Chemistry, Liaoning University, Shenyang 110036; 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2004-04-02 Revised:2004-07-27 Published:2004-12-15
  • Contact: Yang Jia-Zhen E-mail:jzyanglnu@yahoo.com.cn

摘要: 在(298.15 ±0.01) K下用转动弹热量计测定了离子液体硫酸乙酯-1-甲基-3-乙基咪唑(EMIES)及合成它的原料1-甲基咪唑的恒容燃烧热,通过计算得到它们的标准燃烧焓 分别为(-2671±2) 和(-286.3±0.5) kJ·mol-1;标准生成焓 分别为(-3060±3) kJ·mol-1和(-2145±4) kJ·mol-1.结合文献上硫酸二乙酯的标准生成焓数据,得到了合成离子液体EMIES的反应热(-102.3±1.0) kJ·mol-1,与合成实验中观察到的强烈放热现象是一致的.根据离子液体EMIES的热容数据,计算了不同温度下EMIES的标准生成焓.

关键词: 离子液体,  氧弹量热计,  标准燃烧焓,  标准生成焓

Abstract: Using RBC-Ⅱ type oxygen-bomb combustion calorimeter, the molar combustion enthalpies of room temperature ionic liquid, 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES), and 1-methylimidazole were determined at T=(298.15±0.01) K. For EMIES =(-2671±2) kJ·mol-1 and for 1-methylimidazole (-286.3±0.5) kJ·mol-1, respectively. The standard formation enthalpies were calculated to be (-3060±3) kJ·mol-1 for EMIES and (-2145±4) kJ·mol-1 for 1-methylimidazole. The reaction: + (C2H5)2SO4 → [ + C2H5OSO3- ](l) is strong exothermic and its reaction heat, , was determined to be (-102.3±1.0) kJ·mol-1. The standard formation enthalpy of EMIES, ΔfHT, at different temperatures was calculated on the basis of the heat capacity data of EMIES.

Key words: Ionic liquid,  Oxygen-bomb combustion calorimeter,  EMIES,  Standard molar enthalpy of combustion,  Standard molar enthalpy of formation