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Application of the GCA-EOS model to the supercritical processing of associating oil derivatives: fatty acids, alcohols and triglycerides
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Supercritical processes are of interest in the fatty oil industry for a variety of applications: extraction and refining, removal of pollutants, recovery of specialties, hydrogenation of oils and derivatives, etc.
Typical process mixtures include heavy compounds and gases at near critical conditions. At high pressures these asymmetric systems present a complex multiphase behaviour, difficult to model. This complexity increases if some of the mixture components are able to self- and/or cross associate.
In the present work, the group contribution with association equation of state (GCA-EoS) [3] is extended to represent high pressure phase equilibria in mixtures of supercritical gases (carbon dioxide, propane, ethane) with fatty oil derivatives, such as mono- and di-glycerides, fatty acids, alcohols, water and esters. Self- and cross association between associating groups present in these mixtures are considered. Satisfactory correlation and prediction of equilibrium data are obtained. The capacity of the model to follow the behaviour of solutions towards the limit of infinite dilution of the associating components is of particular importance.
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Ferreira, Olga; Pereda, Selva; Bottini, Susana B.; Brignole, Esteban A. (2003). Application of the GCA-Eos model to the supercritical processing of associating oil derivatives: fatty acids, alcohols and triglycerides. In 6th International Symposium on Supercritical Fluids. Versailles, France. p.819-824