FREEZE-DRYING KINETICS APPROACH OF SOLUBLE COFFEE. MASS TRANSFER PARAMETERS ESTIMATION
Date
2017-03-30
Authors
Adina GHIRIŞAN (MICLĂUȘ)
Simion DRĂGAN
Vasile MICLĂUŞ
Journal Title
Journal ISSN
Volume Title
Publisher
STUDIA UBB CHEMIA. Published by Babeş-Bolyai University
Abstract
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 (c2). 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).
Description
STUDIA UBB CHEMIA, LXII, 1, 2017 (p. 7-17), DOI:10.24193/subbchem.2017.1.01
Adina GHIRIŞAN (MICLĂUȘ)
Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania, adina.ghirisan@ubbcluj.ro
https://orcid.org/0000-0002-7341-4365
Simion DRĂGAN
Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania
*Corresponding author: simion.dragan@ubbcluj.ro
https://orcid.org/0000-0002-9849-9940
Vasile MICLĂUŞ
Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania, vasile.miclaus@ubbcluj.ro.
https://orcid.org/0000-0001-7377-526X
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Keywords
coffee, freeze-drying, moisture ration, drying rate, Fick’s diffusion model, effective diffusion coefficient