Activity coefficients at infinite dilution of alkanes, alkenes, alkyl benzenes in dimethylphosphate based ionic liquids using gas–liquid chromatography
| Autor: | Xiang-Bo Li, Ming-Lan Ge, Jie-Ming Xiong, Jin-Yuan Chen, Chun-Yang Lu, Xiao-Yan Liu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Activity coefficient Cyclohexane Inorganic chemistry Analytical chemistry Atomic and Molecular Physics and Optics Dilution Hexane chemistry.chemical_compound chemistry Ionic liquid General Materials Science Physical and Theoretical Chemistry Selectivity Benzene Alkyl |
| Zdroj: | The Journal of Chemical Thermodynamics. 91:279-285 |
| ISSN: | 0021-9614 |
| DOI: | 10.1016/j.jct.2015.07.046 |
| Popis: | Activity coefficients at infinite dilution ( γ i ∞ ) for organic solutes: alkanes, alkenes, and alkyl benzenes in two ionic liquids (ILs) 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) have been measured by the gas–liquid chromatographic method (GLC). The measurements were carried out in the temperature range of (313.15 to 363.15) K. The values of the partial molar excess enthalpies at infinite dilution ( H ‾ i E , ∞ ) were derived from the temperature dependence of the γ i ∞ values. The entropies ( T ref S ‾ i E , ∞ ) and Gibbs energies ( G ‾ i E , ∞ ) of organic solutes at a reference temperature Tref = 298.15 K were also calculated from the γ i ∞ values. Selectivity ( S ij ∞ ) and capacity ( k j ∞ ) at infinite dilution at T = 323.15 K have been determined for hexane (i)/benzene (j), cyclohexane (i)/benzene (j). The results were analyzed in comparison to literature data for other ILs with the [MMIM] and [EMIM] cations. For three isomeric xylenes separation problems, selectivity at T = 323.15 K were also obtained from the γ i ∞ values. |
| Databáze: | OpenAIRE |
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