a The transitional temperature (in K) of nitric acid
condensation assisted with the amine by using default E-AIM input
parameters.
b The limits of the Tc (in K)
resulting from the uncertainties in vapor pressurep0 at 298 K of the amine (unless noted
otherwise). The upper and lower limits of Tc were
obtained by decreasing and increasing p0 at 298
K of the amine by a factor of 3.56, respectively.
c The relative difference in Tcbetween the UNIFAC and the Raoult’s law methods to determine activities
of the amine in an aqueous solution.
d It is assumed that the uncertainty inTc was caused mainly by the uncertainties of thep0 (or KH when
applicable) and activity estimations.
† This uncertainty was within ± 0.05% when the
Henry’s law constant KH of the amine was used. It
was then conservatively estimated by using the extrapolated vapor
pressure at 298 K based on the Antoine Equation of the
amine.5 The enthalpy change at 298 K was extrapolated
based on compiled data by Linstrom and Mallard.5 The
heat capacity was assumed to be the same as that of TMA, −90
J•mol−1•K−1.
‡ Both enthalpy change values of 70.0 kJ/mol and 77.9
kJ/mol5 produced similar results (<0.05%
difference).
* The limits of the Tc (in K)
resulting from the uncertainties in the Henry’s law constantKH at 298 K. The upper and lower limits ofTc were obtained by choosing the maximum and
minimum KH values at 298 K from available
literature values with stated method of determination in
Sander.6 The temperature dependence of the Henry’s law
constants was based on the values recommended by Linstrom and
Mallard.5
** The relative uncertainties were estimated by
comparing with the experimental observations (263 – 278 K) by Wang et
al.2
# The relative uncertainties were less than 0.05%.
(a)