期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 301, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2020.112493
关键词
Ionic liquid; Water; Vapor pressure; UNIFAC-Lei model; Mechanism analysis
资金
- National Natural Science Foundation of China [U1862103]
The vapor pressures of the binary systems (water + [OMIM][BF4], water + [OMIM][Tf2N], and water + [OMIM][PF6]) were measured by a modified equilibrium still at temperatures ranging from 323.15 to 358.15 K and water mole fraction ranging from 0.1 to 0.9 for water + [OMIM][BF4], from 0.1 to 0.4 for water and [OMIM][Tf2N] and from 0.05 to 0.45 for water + [OMIM][PF6] binary systems, respectively. The experimental results indicate that with the addition of ionic liquids (ILs) the vapor pressure of binary systems decreases. In addition, the popular and widely used UNIFAC-Lei model was extended to the corresponding systems to predict the vapor pressures with the average relative deviations (ARDs) of 4.99%, 4.71% and 5.15% for water + [OMIM][BF4]/[OMIM][Tf2N]/[OMIM][PF6] systems, respectively. Moreover, the binding energy, excess enthalpies and s-profiles were investigated to analyze the thermodynamic behavior at the molecular level. It was found that the interaction between [OMIM][BF4] and water is significantly higher than those between [OMIM][Tf2N]/[OMIM][PF6] and water as shown by the sigma-profiles and the binding energy, and the hydrogen bonding interaction is the dominant driving force contributing to the overall excess enthalpy. (C) 2020 Elsevier B.V. All rights reserved.
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