Phase behaviour and mathematical modelling for the system annatto seed oil in compressed carbon dioxide+ethanol as co-solvent

Publication date: December 2017 Source:The Journal of Supercritical Fluids, Volume 130 Author(s): Renata Vardanega, Irede A. Dalmolin, Gislaine C. Nogueira, Tahmasb Hatami, M. Angela A. Meireles This work reports phase equilibrium experimental data (cloud points) for the system annatto seed oil in compressed carbon dioxide+ethanol as co-solvent. The oil was obtained by supercritical fluid extraction at 40°C and 20MPa using carbon dioxide as solvent. The synthetic static method was employed for the measurements, which were carried out in a temperature range from 25 to 60°C and up to 19.32MPa. The experiments were carried out using (CO2 +ethanol) overall mass fraction compositions ranging from 0.82 to 0.99. Experimental results were modelled using artificial neural network (ANN). Results indicate a complex phase behavior for all temperatures investigated with the occurrence of vapor-liquid, liquid-liquid and vapor-liquid-liquid transitions. ANN modelling was an efficient alternative for the thermodynamic models to accurately analysis of the phase equilibrium at high pressure. Graphical abstract

Source: The Journal of Supercritical Fluids - August 5, 2017 Category: Chemistry Source Type: research