Flammability Characteristics of Ionic Liquid 1-Decyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide
Ionic liquids(1Ls) are widely believed that they exert no measurable vapors pressure, and are of low volatility and stable heat capacity, so they are considered to be very promising green solvents.Applications of Ils in electrochemistry, organic synthesis, catalysis and separation areas are rigorous explored recently, and many Ils have been gradually added to the manufacturing process.However, recent research indicates Ils are flammable, so their flammability characteristics indeed limits their industrial applications.In this study, the flammability characteristics of IL 1-Decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(C10mimNTf2), which is one of the candidate extract solvent for extracting rare earth cerium, are examined and explored.TGA/DSC system is used to analyze the decomposition behavior of C 10mimNTf2 during the programmed temperature progress, and TGA-FTIR system is adopted to analyze the evolved gas.The decomposition of C10mimNTf2 in nitrogen atmosphere is found to be endothermic, but it is exothermic in air atmosphere.TGA-FTIR results point that heptane is found in the evolved gas in nitrogen atmosphere, but not found in air atmosphere.Moreover, the concentration of carbon monoxide and carbon dioxide are very high in the evolved gas in air atmosphere.These observations suggest that heptane might be auto-ignites in air atmosphere and was responsible for the exothermic effect.An isothermal TGA/DSC test consolidates this view point.Conventionally, the reactivity hazard of a chemical is identified by its heat release in a decomposition mechanism, but this viewpoint seems not to apply to C10mimNTf2.Although its decomposition does be of endothermic, its decomposition products might be auto-ignited in air atmosphere, and the net heat effect will be exothermic, which indeed leads to the fire and explosion hazards in industrial applications.
Ionic Liquids TGA/DSC TGA-FTIR 1-Decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
You-Nan CHEN Chan-Cheng CHEN Homg-Jang LIAW
Department of Safety, Health, and Environmental Engineering, National Kaohsiung First University of Science and Technology,1 University Road, Yuanchau, Kaohsiung, Taiwan, China
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
426-435
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）