ABSTRACT

Three ionic liquids (ILs), namely 1-butyl-3-methylimidazolium chloride ([C4MIM][Cl]), 1-(2-chlor- oethyl)-3-methylimidazolium chloride ([ClC2MIM][Cl]) and 1-butyl-3-methylimidazolium bromide ([C4MIM][Br]), were investigated as entrainers for the separation of azeotropic mixture of methyl acetate and methanol. Isobaric vapor-liquid equilibrium (VLE) data for the ternary systems containing ILs were measured in a recirculating still at 101.3 kPa. It was found that all the three ILs produced a saltingout effect on methyl acetate, thus enhancing the relative volatility of methyl acetate to methanol. The salting-out effect of the ILs employed in this study follows the order: [C4MIM][Cl] greater than [ClC2MIM] [Cl] greater than [C4MIM][Br]. Moreover, [C4MIM][Cl] could eliminate the azeotropic point at a mole fraction of 0.134. The experimental data were well correlated with the nonrandom two-liquid (NRTL) model.

Compounds

#	Formula	Name
1	C8H15ClN2	1-butyl-3-methylimidazolium chloride
2	C6H10Cl2N2	1-(2-chloroethyl)-3-methyl-1H-imidazol-3-ium chloride
3	C8H15BrN2	1-butyl-3-methylimidazolium bromide
4	C3H6O2	methyl ethanoate
5	CH4O	methanol

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	5 4	Mole fraction - 4 ; Gas	Mole fraction - 4; Liquid	Pressure, kPa; Liquid	Gas Liquid	Chromatography	21
POMD	5 4	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 4; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	21
POMD	5 4 1	Boiling temperature at pressure P, K ; Liquid	Solvent: Mole fraction - 4; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	57
POMD	5 4 2	Boiling temperature at pressure P, K ; Liquid	Solvent: Mole fraction - 4; Liquid Mass fraction - 2; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	60
POMD	5 4 3	Boiling temperature at pressure P, K ; Liquid	Solvent: Mole fraction - 4; Liquid Mass fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	57

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Separation of methyl acetate + methanol azeotropic mixture using ionic liquids as entrainers

Zhang, Z.[Zhigang], Hu, A.[Angran], Zhang, T.[Tao], Zhang, Q.[Qinqin], Sun, M.[Mingyao], Sun, D.[Dezhang], Li, W.[Wenxiu]

ABSTRACT