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| Překlad: |
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| Jazyk dokumentu: |
eng
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| Ročník: |
8
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| Číslo: |
5
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| Rozsah (stránky): |
s. 279-288 : tab., grafy
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| Název zdroje: |
Journal of Occupational and Environmental Hygiene
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| Rok vydání: |
2011
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joeh_2011_05_comparison_wheeler_jonas_model
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| Název: |
A comparison of the Wheeler-Jonas Model and the linear driving force at Constant-Pattern Model for the prediction of the service time of activated carbon cartridges
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| Další názvová informace: |
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| Klíčové slovo: |
náplně
uhlík
absorpce
modely
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| Autor: |
Grévillot, Georges
Marsteau, Stéphanie
Valli?res, Cécile
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| Anotace: |
The linear driving force (LDF) model is applied to predict the service life of activated carbon cartridges. It is compared with the currently used Wheeler-Jonas equation, which results from a model of chemical reaction kinetics. The LDF model is based on a mass transfer model of adsorbate into the particle. The two models are studied in constant-pattern conditions. The properties of the two models are first clarified and then compared. It is shown that the Wheeler-Jonas equation leads to symmetrical breakthrough curves, whereas the constant-pattern LDF equation results in asymmetrical curves. Thus, the curvature of the isotherm has no influence on the shape of the Wheeler-Jonas curve. For the LDF breakthrough curve, it is shown that the asymmetry increases with the curvature of the isotherm. Wheeler-Jonas can be used with a Dubinin-Raduskevitch isotherm, whereas the LDF model analytical solution is valid for a Langmuir isotherm only. The LDF model can be used with the DR isotherm, but a numerical solution is required. At very low concentrations where the isotherm is linear, the constant pattern no longer exists and both models fail. The Dubinin-Raduskevitch isotherm must be fitted with a Langmuir isotherm to use the analytical solution of the LDF model.
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| Bezpečnostní úroveň: |
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| Druh: |
nezadáno
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