Solubility of HFC32, HFC125, HFC134a, HFC143a, and HFC152a in a Pentaerythritol Tetrapentanoate Ester

Abstract

Solubilities of five different hydrofluorocarbons (HFCs) in a pentaerythritol tetrapentanoate ester (95% purity) have been measured at temperatures between 303.15 and 363.15 K and pressures between 0.05 and 1.9 MPa. Henry's constant and the activity coefficient for HFCs at infinite dilution were derived for measurements below 0.26 MPa. The measurements were made with an isochoric method with an uncertainty of less than 2% for Henry's constant and less than 3% at high pressure. Within the investigated temperature range, solubilities for HFCs decrease in the following order: HFC152a > HFC134a > HFC32 > HFC125 > HFC143a. The experimental data have been correlated with a Flory−Huggins model with an extended temperature dependence, which is able to describe the data with a deviation from measured data of less than 2%.

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

“…Therefore, to study the solubility of refrigerant in the compressor oil consisting of only one substance with a known structure has attracted more attention. In the past few years, many experimental investigations focused on the refrigerant in the precursors of synthetic oil have been reported (Bobbo et al, , 2008(Bobbo et al, , 2010Fedele et al, 2009aFedele et al, ,b, 2011Fandino et al, 2008Fandino et al, , 2010aPernechele et al, 2009;Vamling, 1999, 2000).…”

Solubility of carbon dioxide in 2-methylbutyric, 2-methylvaleric and 2-methylhexanoic ester oils

“…Few data are available on the thermophysical properties of the refrigerant + lubricant systems [1][2][3][4][5][6][7][8][9][10][11], and most of them refer to hydrofluorocarbons (HFC) and commercial oils. However, the structure and composition of the commercial oils is usually not defined, since they are mixtures of different components and additives, and this complicates the development of reliable thermodynamic models able to predict the behaviour of the lubricant + refrigerant mixtures.…”

Solubility of Carbon Dioxide in Pentaerythritol Tetrabutyrate (PEC4) and Comparison with Other Linear Chained Pentaerythritol Tetraalkyl Esters

“…Moreover, the regression of these models requires a large number of experimental data to determine the dependence of the solubility on pressure, temperature, and molecular structure. Unfortunately, in the literature there is a lack of such information, except for few systematic works, as [1][2][3][4][5][6][7]. For this reason, our group is involved in a research program to provide experimental measurements and the development of a general predictive model focused on the phase behavior of lubricant + refrigerant blends, with particular attention to systems of POE precursors and CO 2 [8][9][10][11][12][13][14].…”