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• W2324615216 abstract "Although imidazolium-based ionic liquids (ILs) combined with oxygen-containing anions were proposed as the potential solvents for the selective separation of acetylene (C2H2) and ethylene (C2H4), the detailed mechanism at the molecular level is still not well understood. The present work focuses on a most effective IL for removing C2H2 from a C2H4 stream, 1-butyl-3-methylimidazolium acetate ([BMIM][OAc]), aiming at understanding the first steps of the adsorption process of the molecules at the IL surface. We present a combined quantum mechanical (QM) calculation and molecular dynamics (MD) simulation study on the structure and property of the IL as well as its interaction with C2H2 and C2H4 molecules. The calculated results indicate that C2H2 presents a stronger interaction with the IL than C2H4 and the anion of the IL is mainly responsible for the stronger interaction. QM calculations show a stronger hydrogen-binding linkage between an acidic proton of C2H2/C2H4 and the basic oxygen atom in [OAc]− anion, in contrast to the relative weaker association via the C–H···π interaction between C2H2/C2H4 and the cation. From MD simulations, it is observed that in the interfacial region, the butyl chain of cations and methyl of anions point into the vapor phase. The coming molecules on the IL surface may be initially wrapped by the extensive butyl chain and then devolved to the interface or caught into the bulk by the anion of IL. The introduction of guest molecules significantly influences the anion distribution and orientation on the interface, but the cations are not disturbed because of their larger volume and relatively weaker interaction with the changes in the guest molecules. The theoretical results provide insight into the molecular mechanism of the observed selective separation of C2H2 form a C2H4 stream by ILs." @default.
• W2324615216 created "2016-06-24" @default.
• W2324615216 creator A5043435014 @default.
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• W2324615216 date "2012-12-13" @default.
• W2324615216 modified "2023-10-06" @default.
• W2324615216 title "Interface Behaviors of Acetylene and Ethylene Molecules with 1-Butyl-3-methylimidazolium Acetate Ionic Liquid: A Combined Quantum Chemistry Calculation and Molecular Dynamics Simulation Study" @default.
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• W2324615216 doi "https://doi.org/10.1021/am301796w" @default.
• W2324615216 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23211277" @default.
• W2324615216 hasPublicationYear "2012" @default.
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