Identification of Diffusion Transport Properties from Desorption/Sorption Kinetics: An Analysis Based on a New Approximation of Fick Equation during Solid-Liquid Contact

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• 作者：Olivier Vitrac ; Murielle Hayert
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2006
• 出版时间：November 8, 2006
• 年：2006
• 卷：45
• 期：23
• 页码：7941 - 7956
• 全文大小：676K
• 年卷期：v.45,no.23(November 8, 2006)
• ISSN：1520-5045

文摘

The identifiability of three diffusion properties (diffusion coefficient D, partition coefficient K, and convectivemass transfer coefficient h_m) from desorption kinetics (or equivalently sorption kinetics) was investigatedfrom a new approximated analytical solution of 1D diffusion coupled with a Robin boundary condition. Ageneralized least-squares criterion, which extends classical identification techniques, was proposed. Therobustness of classical and modified criteria was compared on both experimental and simulated data includingdifferent sampling strategies and noise levels. Confidence intervals and bias were calculated for a large setof conditions: desorption levels ranged between 30% and 100% (equilibrium), dilution factors ranged between10^-3 and 10^-1, mass Biot numbers ranged between 10^-1 and 10⁴, and K values ranged between 10^-3 and 5.