For these and other reasons, DESs are growing in popularity in
the literature [26–28]. The system most relevant to this research is a
DES prepared with glycerol as a HBD and choline chloride ((2-
hydroxyethyl)trimethylammonium chloride) as a HBA [26,29]. DESs
prepared with glycerol and choline chloride (ChCl) have been studied
for their utility in CO2 and SO2 absorption [30,31], cellulosic biomass
pretreatment [32], and biodiesel synthesis [33], just to name a few.