Application of dicyanamide-based ionic liquid in separation of binary mixtures based on gamma infinity data measurements

Published on Jul 15, 2020in Journal of Molecular Liquids5.065
· DOI :10.1016/J.MOLLIQ.2020.113176
Monika Karpińska15
Estimated H-index: 15
(PAN: Polish Academy of Sciences),
Michał Wlazło20
Estimated H-index: 20
(Warsaw University of Technology)
Source
Abstract
Abstract In this research, the activity coefficients (γ13∞) at infinite dilution of 61 solutes were experimentally determined in the 1-(4-methoxy-4-oxobutyl)-3-methylimidazolium dicyanamide, [(C3COOMe)MIM][DCA]. The data were obtained using the gas-liquid chromatography technique (GLC). The experiment was carried out at a wide temperature range of (318.15 to 368.15) K, in 10 K intervals. The studied solutes included polar and non-polar compounds, as alkanes, alkenes, and alkynes, as well as aromatic hydrocarbons, alcohols, water, ethers, ketones, acetonitrile, pyridine, 1-nitropropane, thiophene, and esters. Density, ρ, measurements for a range of temperatures (298.15–368.15) K, in 10 K intervals, for the chosen ionic liquid (IL) were undertaken at pressure, p = 101 kPa. Values of the gas-liquid partition coefficients, KL at infinite dilution, as well as the basic thermodynamic functions, such as partial molar excess Gibbs energy, enthalpy and entropy at infinite dilution were calculated from the experimental data measurements. The values of selectivity and capacity for the three chosen separation problems as heptane/thiophene, heptane/pyridine and heptane/1-nitropropane were calculated from γ13∞ values and compared to literature data for dicyanamide-based, ILs. The results from the study indicate that [(C3COOMe)MIM][DCA] has attractive capacity for all of the studied separation cases. These measurements allow to verify the possibility of use of investigated ionic liquid as an entrainer in liquid-liquid extraction.
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