Abstract
Gas chromatography-mass spectrometry was used to study the composition of the degradation products of ionic liquids and wood released into the vapor phase during the dissolution of lignocellulosic biomass in 1-butyl-3-methylimidazolium acetate and methyl sulfate and their binary mixtures with dimethyl sulfoxide. It was found that the volatile compounds form at temperatures >100°C, and at 150°C their content can reach 6% of the mass of the initial reaction mixture. They are dominated by methanol and butanol, esters of acetic and benzoic acids, butyl and methyl imidazole, aromatic and aliphatic amines, and toluene. The presence of wood has a significant effect on the thermal decomposition of ionic liquids, including due to the presence of residual moisture. The use of the 1-butyl-3-methylimidazolium methyl sulfate – dimethyl sulfoxide system as a wood solvent leads to the release of many toxic and foul-smelling organosulfur compounds into the vapor phase.
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ACKNOWLEDGMENTS
The study was performed using the equipment of the Core Facility Center “Arktika” of the Northern (Arctic) Federal University.
Funding
The study was financially supported by the Russian Science Foundation (project 18-73-00282). The Belesov’s work was supported by a grant from the Russian Foundation for Basic Research for postgraduate students (project 20-33-90153-asp).
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Translated from Zhurnal Prikladnoi Khimii, No. 3, pp. 353–362, January, 2021 https://doi.org/10.31857/S0044461821030105
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Belesov, A.V., Ladesov, A.V., Pokryshkin, S.A. et al. Study of the Composition of Volatile By-Products, Formed by Dissolution of Wood in Ionic Liquids Based on 1-Butyl-3-Methylimidazolium. Russ J Appl Chem 94, 337–346 (2021). https://doi.org/10.1134/S1070427221030101
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DOI: https://doi.org/10.1134/S1070427221030101