Boiling points and vapor–liquid
equilibrium (VLE) data are
crucial for improving modeling and process design. Therefore, considering
the experimental determination of these primary thermodynamic properties,
a nontraditional technique that has been under study and has shown
some advantages is the differential scanning calorimetry (DSC) technique
and its variations. Following a previous work focused only on pure
compounds, in this work a set of experiments was performed to evaluate
in a systematic way the suitability of its suggested variation of
the DSC technique for binary mixtures. Its optimized condition for
heating rate (24.52 K·min–1) and sample size
(4.6 ± 0.5) mg was used at 4.97 kPa with u(P) = 0.12 kPa for 15 different combinations of n-paraffins and/or fatty alcohols (1-alcohols) in binary mixtures
(n-paraffin + n-paraffin, 1-alcohol
+ 1-alcohol, and n-paraffin + 1-alcohol), taking
into account the difference between the boiling points (T
b) of the pure compounds at the selected pressure (7 to
63 K). Experiments were configured using the equimolar condition,
and pursued effects of this difference on the measured extrapolated
onset temperature, that is, the measured boiling point. For four of
these mixtures other molar fractions were also tested. Estimations
of the boiling points followed the appropriate thermodynamic approach.
The results revealed that the optimized condition may fail in some
situations for binary mixtures, and that this fail could not always
be related to the difference in the boiling points of their pure compounds.
Further work is necessary in this direction.
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