Isobaric vapor-liquid equilibrium data for methanol-benzene-ionic liquid ternary systems have been measured at 101.32 kPa using a modified Othmer still.The ionic liquids employed were 1-ethyl-3-methylimidazolium tetrafluoroborate(BF4),1-butyl-3-methylimidazolium tetrafluoroborate(BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate(BF4).The vapor-liquid equilibrium curves of the methanol-benzene-ionic liquid systems deviate from that of the IL-free system and the deviation increases with increasing amount...