(Vapor + liquid) phase equilibrium measurements for {trifluoroiodomethane (R13I1) + propane (R290)} from T = (258.150 to 283.150) K
Introduction
Propane R290, a natural refrigerant with good potential to replace R22 and R502, has been widely studied and used in refrigeration and heat pump systems [1]. However, the strong flammability must be treated carefully for applications of R290, especially in those cases with large charged quantity. The addition of flame retardant is beneficial for safe operations of R290 refrigeration systems. R13I1 (trifluoroiodomethane) is regarded as a good alternative retardant to replace the traditionally used Halon and a potential refrigerant [2], [3]. So the mixture of (R13I1 + R290) has good potential in the refrigeration fields. The (vapor + liquid) equilibrium (VLE) data are one of the fundamental parameters to calculate thermodynamic properties and optimize refrigeration cycles with the mixtures including flammable working fluids and flame retardants. Therefore, knowledge of VLE for this system is of great interest and significance for academic researches and industry applications.
In this paper, the VLE data measurements for {R13I1 (trifluoroiodomethane) + R290 (propane)} were carried out in a vapor-recirculation apparatus driven by a self-made magnetic pump at T = (258.150 to 283.150) K. The VLE data obtained were correlated using the Peng–Robinson equation of state (PR EoS) [4] with two different models, the van der Waals mixing rule [5], and the Huron–Vidal (HV) mixing rule [6] involving the NRTL [7] activity coefficient model (PR–vdW and PR–HV–NRTL models) for the (R13I1 + R290) system.
Section snippets
Materials
R13I1 was supplied by Nanjing Yuji Tuohao Co. Ltd with a declared mole fraction purity of 0.990. R290 was provided by Dalian DaTe Gases Industry Co. Ltd with a declared mole fraction purity of 0.999. It was verified that the both materials had no impurities obviously detected by a Shimadzu GC2014 gas chromatograph with a thermal conductivity detector (TCD). The mole fraction purities, critical parameters and acentric factors of R13I1 and R290 [8] are summarized in table 1.
Experimental methods
The experimental
Results and discussions
The saturated vapor pressures measured and the comparisons with the values from REFPROP 9.0 [8] for pure R13I1 and R290 are presented in table 2 at T = (258.150, 263.150, 273.150 and 283.150) K. The experimental results show good agreement with the calculated vapor pressures for R290. However, the differences between the experimental values and those in the database for R13I1 are a somewhat greater because of the lower mole purity.
In this work, the measured and the calculated VLE values by the
Conclusions
In this work, the VLE measurements were performed based on a vapor recirculation method at T = (258.150, 263.150, 273.150 and 283.150) K. The measured VLE values were regressed by the PR–vdW and PR–HV–NRTL models. The maximum average absolute relative deviation of pressure is 0.48%, while the maximum average absolute deviation of the vapor phase mole fraction is 0.0040. The results show that both models are suitable for the system studied and the azeotropic behavior occurs at the temperatures
Acknowledgements
This work was financially supported by the National Natural Sciences Foundation of China under the contract number of 51106172 and the National Basic Research Program of China (973 Program) (No. 2011CB710701).
References (11)
- et al.
Int. J. Greenhouse Gas Control
(2009) - et al.
Chemosphere
(1997) Int. J. Refrig.
(2008)- et al.
Chem. Eng. Sci.
(1986) - et al.
Fluid Phase Equilib.
(1979)