Express thermo-gravimetric method for the vaporization enthalpies appraisal for very low volatile molecular and ionic compounds

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• 作者：Sergey P. Verevkin^a ; ^c ; ^{sergey.verevkin@uni-rostock.de} ; Ricardas V. Ralys^a ; Dzmitry H. Zaitsau^a ; Vladimir N. Emel&rsquo ; yanenko^a ; Christoph Schick^b ; ^c
• 关键词：Thermogravimetry ; Ionic liquids ; Enthalpy of vaporization
• 刊名：Thermochimica Acta
• 出版年：2012
• 期刊代码：110_00406031
• 类别：ch
• 出版时间：20 June, 2012
• 卷：538
• 期：Complete
• 页码：55-62
• 文件大小：377 K

摘要

An express method for the determination of vaporization enthalpies of extremely low volatile molecular and ionic liquids has been developed using a commercially available TGA. All experimental parameters (mass loss rate, temperature range, and purge gas flow) crucial for reliable measurements were carefully studied using the reference molecular compounds (n-hexadecane, di-butyl phthalate, methyl and ethyl stearate) with the reliable data. Optimal experimental conditions were recommended. Molar vaporization enthalpies of the low volatile reference molecular compounds were reproduced under optimal conditions better than 2 kJ mol^鈭?. Test measurements with the extremely low volatile ionic liquid [C₂mim][NTf₂] have revealed an agreement with the reliable data already available in the literature within 卤3 kJ mol^鈭?. The experimental conditions recommended in this work allow a quick appraisal of vaporization enthalpies of very low volatile materials within 8 h at a reasonable level of accuracy.