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Citation: LIANG Rui, YANG Mei-Rong, ZHOU Qing-Xiang. Thermal Stability, Equilibrium Vapor Pressure and Standard Enthalpy of Vaporization of 1-Butyl-3-methylimidazolium Tetrafluoroborate[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1468-1472. doi: 10.3866/PKU.WHXB20100637 shu

Thermal Stability, Equilibrium Vapor Pressure and Standard Enthalpy of Vaporization of 1-Butyl-3-methylimidazolium Tetrafluoroborate

1.
School of Chemistry and Environmental Sciences, Henan Normal University, Xinxiang 453007, Henan Province, P. R. China

Received Date: 1 February 2010
Available Online: 10 May 2010

The thermal stability, equilibrium vapor pressure, and standard enthalpy of vaporization of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) ion liquid were investigated using both non-isothermal and isothermal thermogravimetric analysis (TGA) under high purity nitrogen as a carrier gas. The non-isothermal thermogravimetric (TG) curve showed that the onset and peak decomposition temperatures were 697 and 734 K, respectively. However, long-term isothermal TGA studies revealed that the highest application temperature for [bmim][BF4] was 513 K. Moreover, the temperature dependence of the equilibrium vapor pressure and the standard enthalpy of vaporization of [bmim][BF4] were also investigated by TG-based transpiration. In the temperature range of 503-543 K, the relationship between the equilibrium vapor pressure (pe) of [bmim][BF4] and temperature was lgpe=(16±1)+(-6.85±0.25)×103/T. The standard enthalpy of vaporization (△vapHΘ) of [bmim][BF4] was found to be (131±5) kJ·mol-1.
- Ionic liquid,
- 1-Butyl-3-methylimidazoliumtetrafluoroborate,
- Thermal stability,
- Equilibrium vapor pressure,
- Standard enthalpy of vaporization
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