Modeling of Aqueous BTEX Adsorption in Column and Multistage Adsorbers |
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Authors: | Sheng H Lin Cheng Y Huang |
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Affiliation: | 11Prof., Chem. Engrg. Dept., Yuan Ze Univ., Neili, Taoyuan 320, Taiwan; corresponding author.
22Grad. Student, Chem. Engrg. Dept., Yuan Ze Univ., Neili, Taoyuan 320, Taiwan.
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Abstract: | Theoretical and experimental investigations have been conducted on the adsorption characteristics of benzene, toluene, ethylbenzene, and xylene (BTEX) by macroreticular resins. A theoretical model is proposed for describing the BTEX breakthrough curves of the adsorption column. The column adsorption model contains two model parameters, τ and K, that are conveniently estimated using the observed breakthrough data. The model was tested for benzene adsorption with a flow rate between 12 and 30 mL∕min, inlet concentration between 200 and 500 mg∕L, and temperature between 30 and 60°C. Excellent fit of the model to the measured data was obtained. The proposed model hence offers a convenient means for accurate predictions of the adsorption capacity and breakthrough point of a column BTEX adsorption process. Also developed are the mass balance equations representing countercurrent multistage adsorption process. The countercurrent multistage adsorption process has been shown to save a significant amount of adsorption resin in achieving the same BTEX removal as the single-stage process. Experimental tests for a two-stage example verify that up to 60% of the Ambersorb resin can be saved over a single-stage process. |
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