Mathematical Modelling of Supercritical CO2 Extraction of Volatile Oils from Aromatic Plants

0346702 - ÚCHP 2011 RIV GB eng J - Journal Article
Grosso, C. - Coelho, J.P. - Pessoa, F.L.P. - Fareleira, J.M.N.A. - Barroso, J.G. - Urieta, J.S. - Palavra, A.F. - Sovová, Helena
Mathematical Modelling of Supercritical CO2 Extraction of Volatile Oils from Aromatic Plants.
Chemical Engineering Science. Roč. 65, č. 11 (2010), s. 3579-3590. ISSN 0009-2509. E-ISSN 1873-4405
Institutional research plan: CEZ:AV0Z40720504
Keywords : supercritical fluid extraction * modelling * volatile oils
Subject RIV: CI - Industrial Chemistry, Chemical Engineering
Impact factor: 2.379, year: 2010

The modelling of the experimental data of the extraction of the volatile oil from six aromatic plants (coriander, fennel, savoury, winter savoury, cotton lavender and thyme) was performed using five mathematical models, based on differential mass balances. In all cases the extraction was internal diffusion controlled and the internal mass transfer coefficient (ks) has been found to change with pressure, temperature and particle size. For fennel, savoury and cotton lavender, the external mass transfer and the equilibrium phase also influenced the second extraction period, since ks changed with the tested flow rates. In general, the axial dispersion coefficient could be neglected for the conditions studied, since Peclet numbers were high. On the other hand, the solute-matrix interaction had to be considered in order to ensure a satisfactory description of the experimental data.
Permanent Link: http://hdl.handle.net/11104/0187653