De extractie van munt-olie met sub- en superkritische kooldioxide: Ontwerpaspecten voor een productie plant

Document(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science

Phase behavior of the ternary system carbon dioxide + toluene + asphaltene

The effect of carbon dioxide on the phase behavior of a model oil and, in particular, on asphaltene precipitation has been studied in this work. A mixture of toluene and asphaltene with a constant asphaltene mass fraction of 0.0034 on a CO2-free basis was chosen as the model oil. The asphaltene was extracted from a crude oil. The phase transitions from liquid-vapor to liquid and from solid-liquid-vapor to liquid-vapor were determined in the temperature range from 295 K to 365 K and in a pressure range from atmospheric pressure to 7 MPa with the so-called synthetic method. Thereby, different amounts of carbon dioxide were added to the model oil. It was found that the temperature and the CO2 concentration affect the stability of the asphaltene containing model oil solution. If the CO2 concentration is higher than 10 mass%, precipitation of asphaltene occurs

Phase behavior of olive and soybean oils in compressed propane and n-butane

The aim of this work is to report the experimental data and thermodynamic modeling of phase equilibrium of binary systems containing soybean and olive oils with propane and n-butane. Phase equilibrium experiments were carried out using the static synthetic method in a high-pressure variable-volume view cell in the temperature range from 30 to 70ºC and varying the solvent overall composition from 5 to 98 wt%. Vapor-liquid, liquid-liquid and vapor-liquid-liquid phase transitions were observed at relatively low pressures. The Peng-Robinson and the SAFT equations of state without any binary interaction parameters were employed in an attempt at representing the phase behavior of the systems. Results show the satisfactory performance of SAFT-EoS in predicting qualitatively all phase transitions reported in this work