Systematic
investigations on the liquid–liquid phase behavior
of binary mixtures of ionic liquids (IL) of the type 1-alkyl-3-methylimidazolium
bis((trifluoromethyl)sulfonyl)amide (C
x
mimNTf2, x = 2, 4, 6, 8, and 10) with n-heptanol and its branched isomers 3-ethyl-3-pentanol and
2,4-dimethyl-3-pentanol have been performed. The phase diagrams were
determined at atmospheric pressure in the temperature range (T) of 263–448 K by applying the cloud point method.
The phase diagrams are analyzed in terms of well-established numerical
concepts based on Ising criticality. The results are discussed, and
trends and explanations for the shifts of the range of solubility
are given. The systems show partial miscibility with upper critical
solution temperatures. Comparing the solutions in branched alcohols
with those in the linear isomer, the critical solution points are
found to be remarkably shifted toward higher temperatures and lower
IL contents. The trend becomes more pronounced for ILs with shorter
alkyl side chains where also a change of the shape of the phase diagrams
is observed.
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