In
this paper, 182 pvTz data (28 data in the two-phase
region and 154 data
in the superheated
vapor region) of mixtures containing difluoromethane (R32) and trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(E)) are reported.
The measurements were carried out along 10 isochores (0.013173, 0.039422,
0.043115, 0.046522, 0.062966, 0.068225, 0.068959, 0.110447, 0.115156,
and 0.121732 m3·kg–1) in the temperature
range from 263 to 373 K for 10 R32 mole fractions (0.1677, 0.2360,
0.2551, 0.4634, 0.5374, 0.6715, 0.7383, 0.7544, 0.9532, and 0.9533).
The flash method with three equations of state (EoSs) was used to
assess the vapor–liquid equilibrium of the binary mixture under
analysis. The calculated vapor–liquid equilibrium behavior
for the R32 + R1234ze(E) binary system agreed with the experimental
data collected from the open literature. The vapor-phase measurements
were correlated through the aforementioned EoSs and a truncated virial
EoS. These pvTz points agreed with both the values
provided by the EoSs and REFPROP 10.0.
Measurements of PvT properties, saturated pressures, saturated densities, and critical parameters were carried out for R-13I1 (trifluoroiodomethane; CF 3 I). Forty-seven PvT property data in the one-phase region along seven isochores for R-13I1 were obtained in the temperatures between 310 and 405 K, pressures up to 6392 kPa, and densities between 48 and 1784 kg•m −3 using the isochoric method. Thirty-seven saturation pressure data for R-13I1 were obtained in the temperatures between 240 K and the critical temperature and pressures between 58 kPa and the critical pressure. Twenty-six saturated density data for R-13I1 were obtained by the observation of meniscus disappearance and the inflection points of the isochore in the densities between 48 and 1784 kg•m −3 . On the basis of these measurements, the critical temperature, critical density (critical molar volume), and critical pressure of R-13I1 were determined as T c = 396.495 ± 0.010 K (with a coverage factor, k = 2), ρ c = 865 ± 5 kg•m −3 (v c = 226.5 ± 1.3 cm 3 •mol −1 ) (bracketed interval), and P c = 3971 ± 3 kPa (with a coverage factor, k = 2), respectively. Moreover, a correlation for the saturation pressure and correlations for the vapor liquid coexistence curve were established by optimization techniques.
R-1132a is increasingly being considered as a low global warming potential component in alternative mixtures to R-23 in specialized low temperature and ultra-low temperature refrigeration systems. Though the thermodynamic properties of R-1132a were investigated in several studies up to 2018, reinvestigations have been carried out in recent years. In order to contribute toward these renewed measurements, the critical parameters of R-1132a were experimentally re-determined. Thirty-two vapor pressures from 240 K to the critical temperature, fifteen saturated vapor and six saturated liquid densities above 254 K and the
PvT
properties in both the vapor phase (98 points) and liquid phase (34 points) from densities of 50 kg·m
−3
to 760 kg·m
−3
were also measured. Specific correlations for each of these properties were optimized and compared to previously available data from the literature. Additionally, the Peng–Robinson equation of state was used to represent the aforementioned properties and further utilized to determine the enthalpy and entropy of R-1132a.
Supplementary Information
The online version contains supplementary material available at 10.1007/s10765-023-03184-4.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.