High-pressure density and vapor–liquid equilibrium for the binary systems carbon dioxide–ethanol, carbon dioxide–acetone and carbon dioxide–dichloromethane

摘要: Abstract An apparatus for the measurement of vapor–liquid equilibrium (VLE, P–T–x ) data and density saturated-liquid high-pressure liquid phase compressed gas-organic solvent systems was designed, built tested. A synthetic method, with recirculation through a densimeter by magnetic driven centrifugal pump, used. The thermodynamic reached in visual cell variable volume ranging between 30 60 cm 3 . compositions phases were evaluated external gravimetric method. estimated accuracy measured ±0.02 K temperature, ±0.05 MPa pressure, ±0.005 mole fraction ±0.05 g/L density. Vapor–liquid obtained following systems: carbon dioxide–ethanol dioxide–acetone at 291.15, 303.15, 313.15 323.15 K dioxide–dichloromethane 303.15 311.15 K. For latter system, up to 18 MPa. experimental correlated both Peng–Robinson SAFT equation state. EOS gives better correlations accurate predictions phase.