Engineering Physics Annotation << Back Study of Phase Equilibriums of Binary Systems Target Component (Ethyl Acetate, Ethyl Leate, Ethyl Palmitate) – Extractive Agent (Carbon Dioxide, Ethane, Freon R404A) Zaripov Z.I., Mazanov S.V., Nakipov R.R., Solovieva A.O., Aetov A.U., Monakhov I.I. Phase equilibria have been experimentally determined using a constant-volume optical cell for the binary systems ethyl acetate-CO2 , ethyl oleate-CO2 , ethyl oleate-C2 H6 , ethyl oleate-freon R404A, ethyl palmitateCO2 , ethyl palmitate-C2 H6 , ethyl palmitate-freon R404A. In addition to the two-phase region, the results also cover the near-critical state for mixtures. When passing the critical point, the phenomenon of critical opalescence was observed. Data processing was carried out by the gravimetric (weight) method of analyzing liquid and gas phase samples. The research results show good convergence for systems involving CO2 within the measurement uncertainty. Data on phase equilibria with freon R404A were obtained for the first time. The results presented in the work will be in demand for optimizing extraction and separation processes, where carbon dioxide, ethane and freon R404A are used as solvents. Keywords: phase equilibria, carbon dioxide, ethane, freon R404A, ethyl acetate, ethyl oleate, ethyl palmitate. DOI: 10.25791/infizik.10.2025.1507 Pp. 17-26.