Isobaric Vapor–Liquid Equilibrium for Methanol + Dimethyl Carbonate + 1-Octyl-3-methylimidazolium Tetrafluoroborate

Abstract

Isobaric vapor–liquid equilibrium data for {methanol (1) + dimethyl carbonate (2) + 1-octyl-3-methylimidazolium (3)} where 3 is an ionic liquid ([OMIM]+[BF4]−) were obtained at 101.32 kPa using a modified Othmer still. The results indicated that [OMIM]+[BF4]− can transfer the azeotropic point and totally eliminate the azeotropic phenomena when its mole fraction is up to x3 = 0.20. This shows that [OMIM]+[BF4]− could be used as a alternative entrainer in the extractive distillation for methanol (1) + dimethyl carbonate (2) system. The measured ternary vapor–liquid equilibrium data were fitted with the NRTL.