2011•Chemical Engineering(China)Requires access
Vapor-liquid equilibrium for three-component system of tetrahydrofuran-ethanol-ionic liquid
Mingjun Piao
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Abstract
The isobaric vapor-liquid equilibrium data for ionic liquid(IL) 1-octyl-3-methylimidazolium tetrafluororate(BF4) in tetrahydrofuran-ethanol system was measured in a vapor-liquid equilibrium still under 100 kPa.UNIFAC equation was used to correlate the experimental data.The mean deviation between the values of calculation and experiments is 0.007,which indicates that UNIFAC model fits the experimental result highly.The vapor-liquid equilibrium curve of tetrahydrofuran-ethanol system containing BF4 deviates from that of IL-free two-component system.The deviation increases with increasing mole fraction of BF4.Addition of BF4 changes the relative volatility of tetrahydrofuran-ethanol system,and leads to disappearance of the azeotropic point,and the relative volatility for tetrahydrofuran to ethanol increases with increasing of BF4.BF4 can be used as a solvent of extractive distillation for tetrahydrofuran-ethanol system.The optimum mole fraction of BF4 is about 30%.