An apparatus for measuring high-pressure phase equilibria up to 453 K and pressures up to 2000 bar is presented. The applied method of the construction of a phase diagram for a fluid mixture requires the determination of families of P-T diagrams of constant composition (isopleths). The equipment consists of a variable volume cell, a temperature stabilizing system, pressure generation system and a system that makes the loading of the cell with a gas possible. Measurements of liquid - liquid, liquid - vapour and solid - liquid equilibria were performed for two binary systems: ethylene + eicosane and carbon dioxide + squalane.
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