Journal
ENTROPY
Volume 23, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/e23111478
Keywords
ionic liquids; imidazolium; Knudsen effusion mass spectrometry; vapor composition; ylidene; imidazole
Categories
Funding
- Russian Science Foundation [21-73-00041]
- Ministry of Science and Higher Education of Russia [075-15-2021-671]
- Russian Science Foundation [21-73-00041] Funding Source: Russian Science Foundation
Ask authors/readers for more resources
A multi-technique approach was used to study the evaporation of 1-butyl-3-methylimidazolium tetrafluoroborate, revealing a complex vapor composition influenced by evaporation conditions and temperature changes.
A multi-technique approach based on Knudsen effusion mass spectrometry, gas phase chromatography, mass spectrometry, NMR and IR spectroscopy, thermal analysis, and quantum-chemical calculations was used to study the evaporation of 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF(4)). The saturated vapor over BMImBF(4) was shown to have a complex composition which consisted of the neutral ion pairs (NIPs) [BMIm(+)][BF4-], imidazole-2-ylidene C8N2H14BF3, 1-methylimidazole C4N2H6, 1-butene C4H8, hydrogen fluoride HF, and boron trifluoride BF3. The vapor composition strongly depends on the evaporation conditions, shifting from congruent evaporation in the form of NIP under Langmuir conditions (open surface) to primary evaporation in the form of decomposition products under equilibrium conditions (Knudsen cell). Decomposition into imidazole-2-ylidene and HF is preferred. The vapor composition of BMImBF(4) is temperature-depended as well: the fraction ratio of [BMIm(+)][BF4-] NIPs to decomposition products decreased by about a factor of three in the temperature range from 450 K to 510 K.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available