Isothermal (Vapour  +  Liquid) Equilibrium Measurements and Correlation of the Binary Mixture {3,3,3-Trifluoropropene (HFO-1243zf) + 2,3,3,3-tetrafluoropropene (HFO-1234yf)} at Temperatures from 283.15 K to 323.15 K

• Published in: International journal of thermophysics Vol. 44; no. 6
• Main Authors: Fedele, L., Lombardo, G., Menegazzo, D., Scattolini, M., Bobbo, S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2023; Springer Nature B.V
• Subjects: Air conditioning; Binary mixtures; Binary system; Chlorofluorocarbons; Chromatography; Classical Mechanics; Condensed Matter Physics; Equations of state; Equilibrium; Geophysics; Hydrochlorofluorocarbons; Hydrofluorocarbons; Industrial Chemistry/Chemical Engineering; Interaction parameters; Liquid-vapor equilibrium; Mixing rules; Mixtures; Physical Chemistry; Physics; Physics and Astronomy; Thermodynamics; Thermophysical properties; Hydrofluoroolefins; Low GWP; Heat pump; VLE
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-023-03192-4

The many constrains introduced by the F-gas Regulation and the Kigali Amendment to the Montreal Protocol have resulted in an intense search for alternatives to fluorinated greenhouses gases for air conditioning and refrigeration purposes (Mota-Babiloni A, Makhnatch P, in Int J Refrig 127:101–110, 2021). With respect to the urge of new low-GWP and low-ODP refrigerants, blends composed of hydrofluoroolefins (HFO) are considered promising possible substitutes to hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) for HVAC&R applications (Sovacool et al., in Renew Sustain Energy Rev 141:110759), but thermophysical properties data for these blends are still scarce (Bell et al., in: J Chem Eng Data, 2021). In the present study, the vapor–liquid equilibrium (VLE) for the binary system (HFO-1243zf + HFO-1234yf), for which just one set of data on the VLE is available to date in literature, has been experimentally studied by means of a vapor recirculation apparatus. The measurements have been performed at isothermal conditions in the range of temperatures between 283.15 K and 323.15 K, while the composition of both the phases in equilibrium has been measured by gas-chromatographic analysis. The experimental VLE data have been correlated by two different equations of state (EoS): the Peng-Robinson (PR) EoS combined with Mathias–Copeman (MC) alpha function and van der Waals (vdW) mixing rules, and the Helmoltz EoS with dedicated binary interaction parameters. Correlated results showed a good agreement with the experimental data for the binary system.