Determination and correlation of excess molar enthalpies of the binary carbon dioxide + ethyl acetate system at 298.15 to 308.15 K and 5.0 to 7.0 MPa

• The excess molar enthalpies (HE) of the CO2 + ethyl acetate system were measured at 298.15–308.15 K and 5.0–7.0 MPa.
• The experimental HE data indicated exothermic behavior for all compositions at all studied temperatures and pressures.
• Two-phase region, where HE varied linearly with composition, was found in the CO2-rich region except at 298.15 K and 7.0 MPa.
• Experimental HE data within the one-phase region were correlated with the modified Redlich–Kister equation.
• This modified Redlich–Kister equation gave reasonable correlation for the range of temperatures and pressures studied.

Excess molar enthalpies (HE) of the carbon dioxide + ethyl acetate system were measured near the critical point of carbon dioxide using a flow-type isothermal microcalorimeter at 298.15–308.15 K and 5.0–7.0 MPa. Mixtures showed strong exothermic behavior in these regions. The maximum absolute value of HE (maximum exothermic value) was about 8.5 kJ mol−1 at 298.15 K and 5.0 MPa. A two-phase region, where HE varied linearly with composition, was found in the CO2-rich region at all temperatures and pressures except at the condition 298.15 K and 7.0 MPa.