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Reversible phase-change extraction process based on temperature-responsive solvent
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DOI：10.1016/j.ces.2023.118918.png)
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Abstract
En 中文
In this study, N-butylpyridinium tetrachloroferrate ([Bpy][FeCl4]), a temperature-responsive solvent, was applied to achieve reversible phase-change extraction with simultaneous solvent recycling for the ethanol/ heptane and toluene/heptane systems. The distribution and selectivity coefficients were 7.87 and 0.862, respectively, for ethanol in the 60 mass% ethanol/heptane system; the corresponding values for toluene in the 20 mass% toluene/heptane system were 1.34 and 44.3, respectively, which are significantly better than those for existing conventional solvents. [BPy][FeCl4] was reused five times in each system, and the extraction efficiency remained stable at high values. The experimental results as a function of temperature and solvent:solute mass ratio showed that the reversible phase-change process by [BPy][FeCl4] could be achieved under a range of conditions. This process achieves switchable phase-change extraction and simultaneous solvent recovery, thus offering the possibility of saving energy, reducing equipment requirements, and simplifying operations.
Keywords:
Switchable phase-change extraction
Temperature-responsive solvent
Distribution and selectivity coefficients
[BPy][FeCl4]
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4.3
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2.2W
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5.5W
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