Experimental investigations for the phase equilibrium of R1234yf and R1234ze(E) with two linear chained pentaerythritol esters

• The solubilities of R1234yf in PEC4 and PEC5, R1234ze(E) in PEC4 were reported.
• The data were correlated using the PR EoS with HVOS mixing rule and Wilson equation.
• The solubility data of R1234yf, R1234ze(E), and R134a in PEC5 were compared.

R1234yf and R1234ze(E) have been proposed as the most promising refrigerants to substitute R134a due to its low global warming potential. Experimental measurement for the phase equilibrium of R1234yf (or R1234ze(E)) and lubricant oil is an important task in the practical refrigeration system. In this work, the solubilities of R1234yf in pentaerythritol tetrabutyrate (PEC4) and in pentaerythritol tetrapentanoate (PEC5), the two linear chained precursors of polyol ester lubricants, have been measured from T = (293.15 to 348.15) K based on the isochoric method. The obtained solubility data were compared with the literature results of R1234ze(E) and R134a in PEC5. In addition, the solubility of R1234ze(E) in PEC4 was also reported from T = (293.15 to 353.15) K for further comparison. The experimental solubility data were correlated using the Peng–Robinson equation of state with HVOS mixing rules and Wilson equation for the excess Gibbs energy at infinite pressure.