ABSTRACT

Isobaric vapor-liquid equilibria (VLE) for the ternary system acetone + methanol +1-ethyl-3-methylimidazolium dicyanamide ([emim][DCA]) as well as the two solvent + IL binary systems have been obtained at 100 kPa using a recirculating still. The addition of [emim][DCA] to the solvent mixture produced a salting-out effect greater than that produced by other ionic liquids, showing that this ionic liquid is, until now, the best IL tested as an entrainer for the extractive distillation of the acetone + methanol mixtures, causing the azeotrope to disappear for an ionic liquid mole fraction as low as 0.031, at 100 kPa. This behavior can be explained on the basis of the influence of the IL concentration on the activity coefficient of each solvent in the binary mixtures. The electrolyte nonrandom two-liquid (NRTL) model was used for fitting successfully the experimental data.

Compounds

#	Formula	Name
1	C3H6O	acetone
2	CH4O	methanol
3	C8H11N5	1-ethyl-3-methylimidazolium dicyanamide

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	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	1 3	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	32
POMD	2 3	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	40
POMD	2 1 3	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 3; Liquid Solvent: Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	54
POMD	2 1 3	Mole fraction - 1 ; Gas	Mole fraction - 3; Liquid Solvent: Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Gas Liquid	Chromatography	54

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

1-Ethyl-3-methylimidazolium Dicyanamide as a Very Efficient Entrainer for the Extractive Distillation of the Acetone + Methanol System

Orchilles, A. V., Miguel, P. J.[Pablo J.], Gonzalez-Alfaro, V.[Vicenta], Vercher, E.[Ernesto], Martinez-Andreu, A.[Antoni]

ABSTRACT