Modeling of Solid-liquid Extraction of Water-Solubles from Salvia Coccinea (Lamiacea)

Chemical engineering

The aim of this study is to establish models to describe and explain the transfer phenomena of water-soluble solutes in a solid phase plant to a liquid phase (water). These are the leaves and stems of Salvia coccinea. The approach consists of a model establishment to simulate the kinetics of a solid-liquid extraction. Three models were used. The Mafarat and Beliard I, II and pseudo-diffusion models define the overall material transfer coefficients and the solutes concentration of the liquid phase. The Spiro and Kandiah model determines the two time constants corresponding to the diffusion of localized solutes in broken-wall and intact-wall cells, the amount of solutes fraction in broken-wall cells, and the solute concentration. The pseudo-second order kinetic model determines the kinetic constant of extraction and the extraction capacity. Comparing the results of the simulations with the experimental measurements indicates that the models satisfactorily represent the evolution of the extraction operation and that the transfer is divided into two stages, a fast first step consisting of diffusion and a slow step which is a sum of various phenomena.

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