Isobaric Vapor–Liquid Equilibrium for Methanol + Dimethyl Carbonate + Trifluoromethanesulfonate-based Ionic Liquids at 101.3 kPa

Abstract

Isobaric vapor−liquid equilibrium (VLE) data for the binary system methanol + dimethyl carbonate as well as the VLE data for the ternary systems methanol + dimethyl carbonate +1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf]) and methanol + dimethyl carbonate + 1butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][OTf]) at 101.3 kPa have been obtained with a modified Othmer still. The results indicated that both [EMIM][OTf] and [BMIM][OTf] produced crossover effects. Due to the difference of polarity of the two ILs, [BMIM][OTf] eliminated the azeotropic point at mole fraction about 10%, whereas [EMIM][OTf] only pulled down the azeotropic point. The measured VLE data were fitted using the NRTL model with a good consistency.

Separation Effects of Renewable Solvent Ethyl Lactate on the Vapor–Liquid Equilibria of the Methanol + Dimethyl Carbonate Azeotropic System

“…9 The experimental VLE data are summerized in Tables 5 and 6, and are illustrated in Figures 1 and 2 together with the literature values. 11,12,14,17,19,20 Literature VLE data of methanol + the DMC system at 101.3 kPa pass two constituency tests, the point-to-point test of Van Ness et al, 30 in the version of Fredenslund et al, 31,32 and the area test by Herington et al 33 From Figure 1, the experimental VLE data of methanol + DMC system agreed well with the literature values. Literature values for DMC + ethyl lactate system are not available.…”

“…11,14,17,19,20 Average and maximum deviations between the literature and calculated boiling points, |ΔT| av /K, |ΔT| max /K, and those in vapor phase compositions, |Δy 1 | av and |Δy 1 | max , are summarized in Table 8. When these deviations are compared to the ones between their literature and regressed values by activity coefficient models, 11,14,17,19,20 our calculation accuracies are nearly the same to their regression ones. Azeotropic points in the methanol + DMC system were calculated from the determined binary NRTL parameters.…”

“…In this work, we selected a methanol + dimethyl carbonate (DMC) binary azeotropic system, which forms a minimum boiling point azeotrope. In the DMC production process involving transesterification of cyclic carbonates with methanol, azeotropic point of the methanol + DMC system − causes a separation problem. To our knowledge, several salts or organic solvents such as tetramethylammonium bicarbonate, , 2-ethoxyethanol, and 4-methyl-2-pentanone have been employed as entrainers for the separation of methanol + DMC azeotrope.…”

“…To our knowledge, several salts or organic solvents such as tetramethylammonium bicarbonate, , 2-ethoxyethanol, and 4-methyl-2-pentanone have been employed as entrainers for the separation of methanol + DMC azeotrope. Also, different kinds of ILs have also been studied as the entrainers, such as 1-ethyl-3-methylimidazolium ethyl sulfate ([EMIM]­[EtSO 4 ]), tetrafluoroborate-based ILs such as 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]­[BF 4 ]) or 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM]­[BF 4 ]), phosphate-based ILs such as 1-methyl-3-methylimidazolium dimethylphosphate ([MMIM]­[DMP]), 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM]­[DEP]), and 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM]­[DBP]), trifluoromethanesulfonate-based ILs such as 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM]­[OTf]) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM]­[OTf]), 1-ethyl-3-methylimidazolium tetracyanoborate ([EMIM]­[TCB]), and halogen-based ILs such as 1-ethyl-3-methylimidazolium bromide ([EMIM]­[Br]) and 1-butyl-3-methylimidazolium chloride ([BMIM]­[Cl]) . Here, isobaric VLE data of two binary constituent systems, that is, the methanol + DMC and DMC + ethyl lactate systems and the methanol + DMC + ethyl lactate ternary system were measured at (40.00 to 101.3) kPa by an ebulliometric method.…”

Effect of Ionic Liquids on the Isobaric Vapor-Liquid Equilibrium Behavior of Acetone-Chloroform

“…In 1968, Renon and Prausnitz [13] proposed the NRTL model, which was suggested by most authors to correlate the data of ternary VLE containing IL [14][15][16]. Thus, the experimental VLE data for acetone + chloroform and acetone + chloroform + ILs systems were also correlated by the NRTL model.…”