Solubility of Some Phenolic Acids Contained in Citrus Seeds in Supercritical Carbon Dioxide: Comparison of Mixing Rules, Influence of Multicomponent Mixture and Model Validation

摘要

The solubility prediction of any compound in supercritical carbon dioxide is obtained using the dense gas formulation to calculate the phase equilibria. To achieve this, the Peng-Robinson equation of state with the Stryjek-Vera modification is used. Then, this is coupled with the Wong-Sandier and Van derWaals mixing rules. The latter was included in order to evaluate the influence of the mixing rules in the calculation of the solubility. Therefore, the obtained results from the model are compared with experimental data reported in literature for ferulic acid, p-coumaric acid and caffeic acid contained in citrus seeds. Good agreement was obtained between the model and the experimental data for the phenolic acids, when the Wong-Sandier mixing rules are used. Also the influence of the multicomponent mixture is considered for the prediction of the solubility of phenolic acids in supercritical carbon dioxide.