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Název:
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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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Překlad:
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Autor:
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Grévillot, Georges
Marsteau, Stéphanie
Valli?res, Cécile |
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Klíčové slovo:
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náplně
uhlík
absorpce
modely |
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Anotace:
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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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Jazyk dokumentu:
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eng |
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Publikováno na URL:
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Připojené soubory:
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 joeh_2011_05_comparison_wheeler_jonas_model |
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{{'asyncop.tasklist' | i18n}}
