Investigation of the effect of gel properties on supercritical drying kinetics of ionotropic alginate gel particles
| Autor: | Can Erkey, İbrahim Şahin, Erdal Uzunlar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Convection Packed bed Materials science General Chemical Engineering Supercritical drying Kinetics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Divalent Solvent chemistry Chemical engineering Physical and Theoretical Chemistry 0210 nano-technology Porosity Ionotropic effect |
| Zdroj: | The Journal of Supercritical Fluids. 152:104571 |
| ISSN: | 0896-8446 |
| DOI: | 10.1016/j.supflu.2019.104571 |
| Popis: | A series of spherical ionotropic alginate gel particles with different diameters ranging from 2.8 mm to 5.0 mm and porosities ranging from 0.899 to 0.976 were prepared by dripping a Na-alginate solution into a solution of salts of divalent cations (Ca2+, Mn2+, Ni2+, Co2+, Cu2+ and Zn2+). After solvent exchange with ethanol, kinetics of supercritical drying of these ionotropic alginate gel particles in a packed bed was investigated at 308–338 K and 100–120 bar. Experimental data were compared with predictions of a model which considers diffusive transport inside the pores and convection in the flowing fluid stream. The model predicted drying profiles by taking into account only the changes in porosity and diameter of the gel particles. A convective mass transfer coefficient correlation that was originally developed for supercritical drying of Ca-alginate gel particles was found to be suitable for M-alginate gel particles. |
| Databáze: | OpenAIRE |
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