期刊
CHEMICAL ENGINEERING JOURNAL
卷 416, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129168
关键词
Ionic liquids (ILs); Gas dehydration; Structural effect; Quantum chemistry calculation; Molecular dynamics simulation
资金
- National Natural Science Foundation of China [U1862103, 22008003]
- National Postdoctoral Program for Innovative Talents [BX20190021]
The study found that [EMIM][BF4] is the most promising drying agent due to its low Henry's law constant and high diffusion coefficient of H2O. By quantum chemistry calculations and molecular dynamics simulations, the microscopic mechanism was revealed, showing that [EMIM][BF4] has the strongest hydrogen bond interactions with H2O at the molecular level.
Structural effects on various imidazolium?based ionic liquids (ILs) (i.e., [C][A], [C] = [EMIM]+, [BMIM]+, and [OMIM]+; [A] = [BF4]?, [PF6]?, and [Tf2N]?) suitability as drying agents for gas dehydration processes are explored from thermodynamic and dynamic insights by quantum chemistry (QC) calculations and molecular dynamics (MD) simulations. It is found that [EMIM][BF4] is regarded as the most promising drying agent because it exhibits the lowest Henry?s law constant and highest diffusion coefficient of H2O among all ILs. The microscopic mechanism at molecular level is revealed based on QC calculations and MD simulations, and the results demonstrate that the IL (i.e., [EMIM][BF4]) simultaneously with the smallest cation and anion size corresponds to both the strongest hydrogen bond (HB) interaction of H2O?anion and the strongest HB together with van der Waals interactions of H2O?cation. This work provides a valuable guidance from viewpoint of thermodynamics and dynamics for developing and screening novel ILs for gas dehydration.
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