(540f) Supercritical Extraction of Essential Oil from Achillea wilhelmsii: Experiments and Modelling

In this study, supercritical carbon dioxide (SC-CO₂) extraction was used to extract the essential oil from Achillea wilhelmsii. In this way, a series of experiments were designed to investigate the effect of different operating conditions such as temperature (35, 40 and 45 °C), pressure (150, 170 and 190 bar), mean particle size (0.04, 0.06 and 0.08 cm) and dynamic extraction time (0-90 min) on extraction yield. The extracts obtained using SC-CO₂ were analyzed using gas chromatography-mass spectrometry (GC-MS). In chromatographic analyses of essential oil from Achillea wilhelmsii, Carvacrol, Camphor, 14"> -Pinene, Borneol, Thymol and Pinocarvone were identified. The best yield of Achillea wilhelmsii (3.63%) was reported at 45 °C and 190 bar and 40 min. In the second part of the paper, a mathematical modeling for extraction of oil from Achillea wilhelmsii using SC-CO₂ was performed. The model was solved by finite element method (FEM). The results of the model showed a good agreement with experimental data