The solubility of HFC125, HFC134a, HFC143a and HFC152a in n‐eicosane, n‐hexadecane, n‐tridecane and 2, 6, 10, 14‐tetramethylpentadecane

Abstract

The solubility of I , I , I , 2,2-pentafluoroethane (HFC125), I , I , 1,2-tetrafluoroethane (HFCI34a). 1. 1, 1 -trifluoroethane (HFC143a) and 1 ,I -difluoroethane (HFCI 52a) in four well-known hydrocarbons have been measured at temperatures between 293.15 and 363.15 K and pressures between 0.05 and 2 MPa. Henry's constant, and the activity coefficient for HFCs at infinite dilution, have been derived for measurements below 0.28 MPa. The measurements were made with an isochoric method and their uncertainty is less than 2% for Henry's constant and less than 3% at high pressure. For several mixtures, the experimental data have been correlated with the UN/QUAC method and binary interaction parameters have been derived, resulting in a deviation from the data of less than 4%.

Solubility of trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(E)) in pentaerythritol tetrapentanoate (PEC5) in the temperature range from 283.15 to 353.15 K

“…Gas system cell cell Equilibirium cell equlib Equilibirium gas Gas phase exp Experimental value cal Calculated value i n t e r n a t i o n a l j o u r n a l o f r e f r i g e r a t i o n 4 8 ( 2 0 1 4 ) 1 1 4 e1 2 0 calculated from the pressure change in a gas system of known volume and the measured temperature, and it is similar as those described by Wahlstrom and Vamling (1997) and Fandino et al (2008). The schematic diagram of solubility measurement apparatus is shown in Fig.…”

Prediction of phase equilibria and thermodynamic properties of refrigerant/oil solutions

“…The deviations of the described prediction method from the experimental data points, published in [2,3,[21][22][23], are shown in Figs. 3-5.…”

“…Thus, due to the above-mentioned difficulties, the development of calculation methods for the thermodynamic properties of the ROS reduces to the description of the available experimental information on the phase equilibrium by different thermodynamic models [1][2][3]. The problem of calculation of the caloric properties remains indeterminate within the frameworks of such investigations.…”

“…The presence of oil admixtures in the refrigerant has a great influence on the thermodynamic properties of the working fluid, shifting the points of the refrigeration cycle. At the same time, theoretical methods [1][2][3] for calculation of the thermodynamic properties of such complicated systems as refrigerant/oil solutions (ROS) are not accurate enough. There are various reasons for the existing situation.…”

Prediction of solubility for HFC working fluids in model substances for compressor oils

“…For mixtures consisting of HFC143a or HFC125, such data for the highest temperatures could not be used since the substances become supercritical; the critical temperature is 346.3 K for HFC143a, and 339.4 K for HFC125. All experimental data are given by Wahlstrom and Vamling (1997) except for the HFCl52a-tetracosane mixture which is presented in Appendix A.The data were of two different kinds: some mixtures have solubilities only at low pressures (below 0.28 MPa, measurement of Henry's constant) and others have solubilities at both low and high pressures. For the low-pressure measurements, the pressure vs. composition data used for the derivation of Henry's constant were used.…”