A New Empirical Model for Calculation the Effective Diffusion Coefficient for Solid鈥揕iquid Extraction from Plants
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- 作者：Chavdar Chilev ; Velichka Koleva ; Evgeni Simeonov
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2014
- 出版时间：April 16, 2014
- 年：2014
- 卷：53
- 期：15
- 页码：6288-6296
- 全文大小：525K
- 年卷期：v.53,no.15(April 16, 2014)
- ISSN：1520-5045
文摘
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鈥搒olid ratio (尉 = 0.01, 0.02, and 0.03 m3 kg鈥?), temperature (20, 40, and 50 掳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 function to describe an extraction process. It can be used to estimate and control the process.