INVESTIGADORES
ZABALOY Marcelo Santiago
congresos y reuniones científicas
Título:
Liquid-Vapor and Liquid-Liquid-Vapor Equilibria for Systems containing Carbon Dioxide, Propane and Triglycerides
Autor/es:
PABLO E. HEGEL; MARTÍN CISMONDI; GUILLERMO D.B. MABE; MARCELO S. ZABALOY; ESTEBAN A. BRIGNOLE
Lugar:
Morelia, Michoacán, México
Reunión:
Conferencia; EQUIFASE 2006: VII Conferencia Iberoamericana sobre Equilibrio entre Fases para el Diseño de Procesos.; 2006
Resumen:
In previous works we obtained vapor-liquid-liquid experimental data for the system CO2 + propane + sunflower oil and vapor-liquid data for the system CO2 + sunflower oil. Liquid CO2 is immiscible and with very low solvent power for vegetable oils. Propane has good solvent power for vegetable oils but is flammable. By adding CO2 to propane it is possible to have a vapor phase composition outside the flammability range. In this case, it is still possible to avoid the formation of a second liquid phase at suitable extraction conditions, i.e., to have full miscibility between the solvent mixture and the oil. In the present work, we extend the database with new experimental data on bubble pressures for the ternary system CO2 + propane + sunflower oil up to the temperature at which the liquid phase becomes unstable. To this end, we used a variable volume equilibrium cell. In this work, we also present new experimental phase equilibria data for the systems n-hexane/ triacetin, propane/triacetin and CO2/triacetin. We model this system using the Group Contribution Equation of State (GC-EOS) coupled to a parameterization strategy based on the observation of the predicted global phase equilibrium behavior (GPEB) for the binary subsystems. We carry out this task with the help of the computer program GPEC. The GPEB is defined by critical and vapor-liquid-liquid lines. In this way, revised parameter values for the interactions between the triester group and the alkane and CO2 groups, respectively are obtained.