US EPA

1452679 

Journal Article 

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

Vicent Orchilles, A; Miguel, PJ; Gonzalez-Alfaro, V; Vercher, E; Martinez-Andreu, A 

2012 

Yes 

Journal of Chemical and Engineering Data
ISSN: 0021-9568
EISSN: 1520-5134 

57 

2 

394-399 

10.1021/je200972w 

WOS:000299985000023 

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.