High-pressure vapor-liquid-phase equilibria (P-T-x-y) for the palm oil-SF 6 and coconut oil-SF 6 systems were investigated at temperatures of (313.15 and 333.15) K in the pressure range from (1 to 50) MPa. The phase behavior of two vegetable oils in sulfur hexafluoride (SF 6 ) was studied using an isothermal-analytical method in combination with a visual-synthetic method using a variable-volume cell. For both systems, at the lower investigated temperature of 313.15 K, the transition from a two-phase system to a three-phase system was observed visually under conditions near the phase transition of SF 6 from a vapor to a liquid phase. Moreover, the phase inversions for the vegetable oil-SF 6 systems were also recorded at both temperatures under investigation.
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