Choline chloride-based deep eutectic solvents as green extractant for the efficient extraction of 1-butanol or 2-butanol from azeotropic n-heptane + butanol mixtures
In this study, choline chloride-based deep eutectic solvents are used as green extractant for the efficient extraction of 1-butanol or 2-butanol from azeotropic n-heptane + butanol mixtures at 298.15 K and atmospheric pressure. Choline chloride as hydrogen bond acceptor (HBA) is mixed with urea, eth...
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Veröffentlicht in: | Journal of molecular liquids 2020-09, Vol.313, p.113524, Article 113524 |
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Sprache: | eng |
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Zusammenfassung: | In this study, choline chloride-based deep eutectic solvents are used as green extractant for the efficient extraction of 1-butanol or 2-butanol from azeotropic n-heptane + butanol mixtures at 298.15 K and atmospheric pressure. Choline chloride as hydrogen bond acceptor (HBA) is mixed with urea, ethylene glycol, glycerol, and 1,2-propanediol (propylene glycol) as hydrogen bond donors (HBDs) to study the effect of different choline chloride-based deep eutectic solvents on the extraction efficiency. The obtained results show that, although all the DESs provide solute distribution ratios smaller than unity (β > 1), which is of interest for the economic feasibility of industrial extraction operations. The extraction capacity of the studied deep eutectic solvents for the separation of n-heptane +1-butanol mixture is compared with seven commonly used imidazolium-based ionic liquids. The experimental results are compared to UNIQUAC Functional-group Activity Coefficients (UNIFAC) model. It is visually observed that UNIFAC model predicts satisfactorily the equilibrium tie-lines, where the root-mean-square deviation (RMSD) for extraction of 1-butanol by ChCl-urea, ChCl-ethylene glycol, ChCl-glycerol and ChCl-1,2-propanediol are 2.99, 4.38, 1.12, and 1.56, respectively. In the case of 2-butanol extraction using the mentioned DESs, the RMSD is 0.69, 3.13, 1.47, and 1.11, respectively.
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•Choline chloride-based deep eutectic solvents DESs to separate azeotropic mixtures•LLE measurements for different pseudo-ternary n-heptane+1-butanol / 2-butanol+DESs•Efficiency of DESs was interestingly compared with imidazolium-based ionic liquids•The experimental LLE data are predicted using UNIFAC model. |
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ISSN: | 0167-7322 1873-3166 |
DOI: | 10.1016/j.molliq.2020.113524 |