Isobaric vapor-liquid equilibrium for ethyl acetate-isopropanol-1-octyl-3-methylimidazolium tetrafluoroborate

摘要

In order to study the possibility of separating ethyl acetate and isopropanol by extractive distillation with ILs as an entrainer.Isobaric vapor-liquid equilibrium data for ethyl acetate + isopropanol+ 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM]BF4) ternary system at 101.32 kPa were determined using a recirculating still.The results showed that the ionic liquid (IL) studied produced a notable salting-out effect,which enhanced the relative volatility of ethyl acetate to isopropanol and eliminated the azeotrope when the mole fraction of IL in the liquid phase was greater than 0.10.Therefore,[OMIM]BF4 can be used as the extraction agent of extractive distillation for ethyl acetate + isopropanol systerm,the suitable mole fraction of [OMIM]BF4 is about 20％.The experimental data were correlated with the NRTL model,the correlated results agreed well with the experimental data.