Abstract
Isobaric vapor-liquid equilibrium data for the ternary systems of dichloromethane (DCM)+methanol+ionic liquids (ILs) were measured at a constant pressure of 101.3kPa using a modified Othmer and they were also amended and correlated using the NRTL equation and the results corresponded closely to the original data. The ILs used were 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Hmim][NTf2]) and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Bmim][NTf2]). The results indicated that the addition of ILs had an outstanding effect on the azeotropic system and [Bmim][BF4] and [Hmim][NTf2] could remove the azeotropic point with the mole fraction of 0.109 and 0.162, respectively, which means they could break the azeotropic phenomenon of DCM+methanol. The influence of concentration and kind of ILs was also discussed in this work.
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