Thermodynamics and activity coefficients at infinite dilution for organic solutes in the ionic liquid 1-butyl-1-methylpyrrolidinium dicyanamide
| Autor: | P. Naidoo, Marcin Durski, Deresh Ramjugernath, Urszula Domańska |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Activity coefficient
General Chemical Engineering Enthalpy General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Ethylbenzene 0104 chemical sciences Gibbs free energy chemistry.chemical_compound symbols.namesake 020401 chemical engineering chemistry Ionic liquid Thiophene symbols Physical chemistry 0204 chemical engineering Physical and Theoretical Chemistry Benzene Dicyanamide |
| Zdroj: | Fluid Phase Equilibria. 473:175-182 |
| ISSN: | 0378-3812 |
| Popis: | The activity coefficients at infinite dilution, γ 13 ∞ , for 46 solutes, including alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, esters, aldehyde, acetonitrile, pyridine and 1-nitropropane in the ionic liquid (IL) 1-butyl-1-methylpyrrolidynium dicyanamide, [BMPYR][DCA] were determined by gas-liquid chromatography at five temperatures in range of (313.15–373.15) K at pressure, p = 101 kPa. The thermodynamic functions at infinite dilution as partial molar excess Gibbs free energy, Δ G 1 E, ∞ , enthalpy Δ H 1 E, ∞ , and entropy term T ref Δ S 1 E , ∞ and the gas-liquid partition coefficients, K L at infinite dilution were calculated from the experimental γ 13 ∞ values obtained over the temperature range. The values of selectivity and capacity for few separation problems as n-heptane/benzene, n-heptane/thiophene, n-heptane/1-heptyne, and ethylbenzene/styrene at T = 323.15 K were calculated from γ 13 ∞ and compared to literature values for [DCA]-based ionic liquids and [BMPYR]-based ILs. In comparison with the former measured [BMPYR][TCM], or [BMPYR][SCN] ILs, the [DCA]-based IL presents high selectivities for the separation of aromatic hydrocarbons from aliphatic hydrocarbons, and especially for the extraction of thiophene, or pyridine from n-heptane with slightly lower capacity than those for [BMPYR][TCM], or [BMPYR][SCN]. New data shows that [BMPYR][DCA] IL may be proposed as an alternative solvent for the separation of aliphatic from aromatic hydrocarbons. |
| Databáze: | OpenAIRE |
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