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.