Analysis of the thermal hazards of 1-butyl-3-methylimidazolium chloride mixtures with cellulose and various metals
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Ionic liquids (ILs) are a relatively new class of environmentally benign and comparatively safe solvents and are expected to have numerous applications in chemical processes. Although pure ILs are thermally stable, the presence of impurities can affect their thermal stability and decomposition behavior. In addition, ILs decomposition products include flammable gases that may present a fire hazard. When designing safer processes and operating conditions, it is therefore important to investigate IL thermal properties and decomposition products in combination with additives. The present work focused on cellulose dissolution which is promising application of ILs to obtain better understanding of thermal hazards. Mixtures of cellulose, iron (III) oxide (Fe2O3), copper(II) oxide (CuO), chromium, and nickel with 1-butyl-3-methylimidazolium chloride (BmimCl) were examined, using differential scanning calorimetry, high-sensitivity calorimetry, and thermogravimetry–differential thermal analysis–mass spectrometry. The addition of CuO was found to generate an exothermic reaction below the decomposition temperature of BmimCl and also to lower the decomposition temperature. BmimCl/CuO mixtures also produced extremely flammable gases below the decomposition temperature of pure BmimCl.
KeywordsIonic liquids Thermal hazards Cellulose dissolving 1-Butyl-3-methylimidazolium chloride Evolved gas analysis
- 2.Martyn JE, Kenneth RS. Ionic liquids. Green solvents for the future. Pure Appl Chem. 2000;72:1391–8.Google Scholar
- 9.Samir IAE. Ionic liquids recycling and reuse. In: Scott TH, editor. Ionic liquids—classes and properties. London: Intech; 2011. p. 239–72.Google Scholar
- 12.Francis S. Atsumi Miyake translator. Thermal safety of chemical process: risk assessment and process design. Tokyo: Maruzen; 2011.Google Scholar
- 13.Horng-Jang L, Shih-Kai H, Hao-Ying C, Sheng-Nan L. 2012 International symposium on safety science and technology reason for ionic liquids to be combustible. Procedia Engineering, vol. 45; 2012. p. 502–6.Google Scholar
- 15.Helen LN, Karen L, Liesl H, Alan BM. Thermal properties of imidazolium ionic liquids. Thermochim Acta. 2000;357–8:97–102.Google Scholar
- 24.Hyungsup K, Yongjun A, Seung Y. Comparing the influence of acetate and chloride anions on the structure of ionic liquid pretreated lignocellulosic biomass. Biomass Bioenergy. 2016;93:234–53.Google Scholar
- 30.United Nations. Globally harmonized system of classification and labeling of chemicals (GHS) fourth revised edition. 2011. https://www.unece.org/fileadmin/DAM/trans/danger/publi/ghs/ghs_rev04/English/ST-SG-AC10-30-Rev4e.pdf. Accessed 25 June 2017.
- 34.NIST Mass Spec Data Center. Mass Spectra in NIST Chemistry WebBook, NIST Standard Reference Database Number 69. Eds. https://doi.org/10.18434/t4d303. Accessed 21 July 2017.
- 35.Siedlecka EM, Czerwicka M, Neumann J, Stepnowski P, Fernández JF, Thöming J. Ionic liquids: methods of degradation and recovery. In: Ionic liquids: theory, properties, new approaches. 2011. http://www.intechopen.com/books/ionic-liquids-theory-properties-new-approaches/ionic-liquids-methods-of-degradation-and-recovery. Accessed 18 July 2017.