A New Empirical Model for Calculation the Effective Diffusion Coefficient for Solid–Liquid Extraction from Plants
| Autor: | Velichka Koleva, Chavdar Chilev, Evgeni Simeonov |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 53:6288-6296 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | The current work is concerned with obtaining a new empirical model for the time-variable effective diffusion coefficient (Deff) by extraction from plant materials. It has been applied for describing a solid liquid extraction from Cotinus coggygria and compared with experimentally obtained extraction kinetics. The experiments have been performed by changing the liquid–solid ratio (ξ = 0.01, 0.02, and 0.03 m3 kg–1), temperature (20, 40, and 50 °C), and extraction solvents (water, 50% ethanol in water, and 70% ethanol in water). A nonlinear seven-parametric model for Deff is obtained in order to represent the influence of those parameters on the extraction process and Deff, respectively. The parameters of the model are obtained by a nonlinear regression of Deff values calculated using the method of regular regime. All experimental conditions have been taken into consideration. A very good coincidence between experimental and empirically obtained data has been found. This is a proof for the ability of the fun... |
| Databáze: | OpenAIRE |
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