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With the present contribution we clarify the phase behaviour of choline chloride (ChCl) + ethylene glycol (EG) mixtures for ChCl mole fractions (xChCl) less than 0. 333 and temperatures below 323 K by providing melting points obtained by differential scanning calorimetry for samples containing xChCl = 0. 171) which is characterized by a melting point of 244 K. This temperature is only 16 K below the melting point of neat EG. Thus, neither from its particular composition nor from the observed melting-point depression of ChCl + EG mixtures can ethaline be considered a "deep eutectic solvent". Surprisingly, despite ChCl being an electrolyte dissolved in EG, the phase diagram is that of an ideal binary mixture.
Agieienko et al. (Sat,) studied this question.
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