AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.1 din 2017 | |||||||
Articol: |
FREEZE-DRYING KINETICS APPROACH OF SOLUBLE COFFEE. MASS TRANSFER PARAMETERS ESTIMATION. Autori: ADINA GHIRIȘAN, SIMION DRĂGAN, VASILE MICLĂUŞ. |
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Rezumat: DOI: http://dx.doi.org/10.24193/subbchem.2017.1.01 Published Online: 2017-03-17 Published Print: 2017-03-31 VIEW PDF: FREEZE-DRYING KINETICS APPROACH OF SOLUBLE COFFEE. MASS TRANSFER PARAMETERS ESTIMATION The present paper presents the freeze-drying kinetics of soluble coffee in order to determine the mass transfer parameters. Several semi-theoretical and empirical models were used to find the best fit to the experimental data. The applied models were compared using the coefficient of determination (R2), the mean relative percent error (P), the root mean square error (RMSE) and the reduced chi-square (X2). The Midilli model was found to fit better to the experimental freeze-drying data comparative to other models. The Fick’s second law was employed to determine the effective diffusion coefficient (Deff). Keywords: coffee, freeze-drying, moisture ration, drying rate, Fick’s diffusion model, effective diffusion coefficient. |
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