The demand for acetoacetate-based compounds has risen significantly in recent years due to their unique

physicochemical properties and wide-ranging industrial applications. The critical-point, dew-point, and bubble-point

equilibria data for the 3-pentyl acetoacetate + carbon dioxide (CO2) binary system in the temperature range of 313.2 K to

393.2 K and pressure limited to 20.06 MPa were measured. The mole fraction responses were acquired in the range of

(0.0433 to 0.7950). The pressure–temperature diagrams indicated that the critical locus of the mixture formed a continuous

boundary connecting the critical points of CO2 and pure 3-pentyl acetoacetate. The binary system 3-pentyl acetoacetate

+ CO2 did not display 3-phases according to the vapor-liquid equilibria research at the test temperature. At a fixed

temperature, the solubility of the system was found to increase with increasing mole fraction of 3-pentyl acetoacetate. The

observed phase behavior corresponded to a Type-I system according to the classification of Van Konynenburg and Scott.

Additionally, the experimentally measured bubble-point pressures were correlated using the PR EoS (Peng–Robinson

equation of state) combined with vdW(van der Waals) one-fluid mixing rules. The binary interaction parameters (kᵢⱼ=0.005

and ηᵢⱼ=-0.025) were optimized and determined for the 3-pentyl acetoacetate+CO2 system. The model predictions showed

good agreement with the experimental data, yielding RMSD (root mean square deviation) values of 8.14%, 5.05%,

3.37%, 3.36%, and 2.90% across the investigated temperature range.

High-pressure phase behavior, Carbon dioxide, 3-Pentyl acetoacetate, Supercritical fluids

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