Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Pressure composition isotherms are obtained for the carbon dioxide + 2,2,3,3,4,4,5,5-octafluoropentyl acrylate (OFPA) and carbon dioxide + 2,2,3,3,4,4,5,5-octafluoropentyl methacrylate (OFPMA) systems using a static apparatus at a temperature range from (313.2 to 393.2) K and pressures up to 17.86 MPa. The solubility of OFPA and OFPMA for the (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems increases as the temperature increases at constant pressure. Liquid liquid vapor equilibria for the (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems were not observed at these conditions. We determined new parameters for the critical constants by using the Joback, modified Joback, and Constantinou Gani group contribution methods. The acentric factor was determined by using Ambrose and Walton's method. Using these parameters, the experimental results for (carbon dioxide + OFPA) and (carbon dioxide + OFPMA) systems are correlated with the Peng Robinson equation of state (EOS) using a van der Waals one-fluid mixing rule including two adjustable parameters. We compared the three Joback, modified Joback, and Constantinou Gani group contribution methods.