Vapor–liquid equilibria of carbon dioxide with isopropyl acetate, diethyl carbonate and ethyl butyrate at elevated pressures

Vapor–liquid equilibria for carbon dioxide with three esters of isopropyl acetate, diethyl carbonate and ethyl butyrate were measured in this study at 308.45, 313.45 and 318.55 K and at elevated pressures up to 8.9 MPa. A static type phase equilibrium apparatus with visual sapphire windows was used in the experimental measurements. Equilibrium compositions in both vapor and liquid phases and the vapor–liquid equilibrium (VLE) constants are reported. The solubility for each ester compound in the vapor phase is in the order of 10−3 mole fraction. These new VLE data were correlated using either the equation of state (EOS) or activity coefficient model. It is shown that the Peng–Robinson or Soave–Redlich–Kwong EOS with van der Waals mixing rules gives satisfactory results. These VLE data are also well correlated by the UNIQUAC activity coefficient model with two optimally fitted binary interaction parameters.