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多孔介质期刊
影响因子: 1.061 5年影响因子: 1.151 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v17.i12.20
pages 1045-1052

EXISTENCE OF A CHARACTERISTIC TEMPERATURE IN THE CASE OF ADSORPTION ON ACTIVATED CARBON

Mhiri Foued
Institut Preparatoire aux Etudes d'Ingenieurs de Monastir (University of Monastir), Rue Inb El Jazzar, 5019 Monastir, Tunisie
Abdelmajid Jemni
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationale d'Ingénieurs de Monastir, University of Monastir, Avenue Ibn El Jazzar, 5019, Monastir, Tunisie

ABSTRACT

We have studied adsorption on AC35 activated carbon for two adsorbates, methanol and acetone. For each one, we have carried out an investigation using two different approaches: (1) study of equilibrium isotherms, quantity of matter adsorbed in function of the pressure, the values read at equilibrium; (2) the kinetic isotherms, the quantity of matter adsorbed in function of the time. The two approaches confirm the existence of a characteristic temperature. The change ofthe geometric forms ofthe equilibrium isotherms for a certain value oftemperature clearly reveals the behavior of the adsorbent with regard to the adsorbate. This approach does not allow us to state with certitude the cause of this change of behavior. The utilized kinetic model lets appear the characteristic time of the matter adsorption (l/ω2). For each couple, the study of this characteristic time variation in the function of the temperature confirms the characteristic temperature and allows us to calculate its value. The thermal balance reveals that the adsorption speed is proportional to the thermal conductance and is seen as the duality between the thermal resistance and the characteristic adsorption time. The nonlinearity of the ω2 variation in the function of the temperature implies that the variation of the average thermal resistance in the function ofthe temperature is not linear.


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