Deep eutectic solvents (DESs) are called 'designer solvents' due to various
structural variations and the benefit of tailoring their physicochemical
properties. For industrial applications of DESs it is crucial to know their
physical and thermodynamic properties such as density, viscosity, and
refractive index. These properties were measured for three lecithin
(LEC)-based DESs with glycerol (G), triethanolamine (TEOA), and oleic acid
(OLA) as functions of temperature. The viscosity was fitted by both
Arrhenius-type and Vogel-Tamman-Fulcher equations. The density, viscosity,
and refractive index of tested DESs decreased with the increase in
temperature. The LEC:G DES exhibited the lowest density at all tested
temperatures. This DES was selected as a cosolvent in the ethanolysis of
cold-pressed black mustard (Brassica nigra L.) seed oil catalyzed by either
calcined or non-calcined CaO. The reaction was carried out in a batch
stirred reactor under the following conditions: the temperature of 70?C,
the ethanol-to-oil molar ratio of 12:1, and the amount of DES and CaO of 20
and 10 wt.% (to oil), respectively. The presence of DES accelerated the
reaction, while the separation of the final reaction mixture phases was
faster.
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