Deep eutectic solvents (DESs) formed by choline
chloride and urea or glycerol were tested for the separation of
azeotropic mixtures. The case study was the separation of ethanol−
ethyl propionate and n-propanol−n-propyl propionate. For this
aim, the experimental data of liquid−liquid equilibria (LLEs) were
obtained at temperature 293.15 K and atmospheric pressure.
Liquid−liquid tie lines were determined using NMR spectroscopy
and analyzed. The extraction performance of DESs was
characterized with distribution coefficients and values of selectivity
to alcohol. Comparison of selectivity values in systems containing
alcohols and esters with another DES formed by choline chloride and malonic acid was carried out. The NRTL model for LLE data
correlation was used. The model is shown to give rather good estimates for the selectivity values.