TANASE DOBRE, OANA-CRISTINA PARVULESCU1, ANICUTA STOICA, MARTA STROESCU EXPERIMENTAL INVESTIGATION AND MODELLING OF INULIN AND GLYCYRRHIZIN EXTRACTION
Inulin and glycyrrhizin extraction from crushed roots of chicory and licorice (Glycyrrhiza glabra) in batch contacting, with various liquid media, was studied in order to identify specific parameters characterizing process dynamics and equilibrium. In the case of non reactive extraction the process equilibrium was expressed by means of species distribution law between solid and liquid phases. Due to the structure of particle of chicory and licorice roots the extraction dynamics is controlled by species diffusion in its inside. In the case of chicory roots the rapid swelling of solid enhances the extraction process, whereas for the licorice roots this phenomenon can be neglected. The determined values of diffusion coefficients, which are near to those characterizing gel or liquid diffusion, can be explained as a swelling consequence. The obtained data can be used to scale-up a specific process for inulin and glycyrrhizin extraction.
Keywords: inulin, glycyrrhizin, solid-liquid extraction, effective diffusion coefficient, distribution coefficient