Phase equilibrium of two CO2+ biodegradable oil systems up to 72 MPa

Teresa Regueira Muñiz, Olivia Fandiño, Luis Lugo, Enriqueta R. López, Josefa Fernández

Research output: Contribution to journalJournal articleResearchpeer-review


A setup based on a static visual synthetic method for determining phase equilibria up to 100 MPa is presented. Solubilities of carbon dioxide (CO 2) in a high-oleic sunflower oil (HOSO) and in an additivated vegetable lubricant (BIO-2T-05) were determined from 298 K to 363 K up to CO2 mass compositions of 0.42. The experimental device was verified comparing the solubilities of CO2 in HOSO with values from other laboratory. For both systems, the values of CO2 solubility show cross-over pressures among the different isotherms. A new equation was used to correlate the solubility data, with deviations in CO2 mole fraction in the oil-rich phase lower than 1.6%. The prediction ability of Carvalho and Coutinho equation was tested with experimental data. Vapor-liquid-liquid equilibria were also investigated for CO2 + BIO-2T-05 in the range 288-305 K. Furthermore, densities and viscosities at 0.1 MPa for BIO-2T-05 were measured from 278 K to 373 K. © 2014 Elsevier B.V.
Original languageEnglish
JournalJournal of Supercritical Fluids
Pages (from-to)90-97
Publication statusPublished - 2014
Externally publishedYes


  • Carbon dioxide
  • Lubricant
  • Solubility
  • Vapor liquid liquid equilibrium
  • Vegetable oil
  • Lubricants
  • Phase equilibria
  • Vapors
  • Vegetable oils
  • Bio-degradable oil
  • Experimental devices
  • High-oleic sunflower oil
  • Mass composition
  • Mole fraction
  • Solubility data
  • Synthetic methods
  • Vapor-liquid-liquid equilibrium


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