Three-Step Catalytic Detoxification Process of Wastewater Containing Chlorinated Aromatic Compounds: Experimental Results and Modeling Issues

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• 作者：Vincent Felis ; Pierre Fouilloux ; Claude De Bellefon ; and Daniel Schweich
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：1999
• 出版时间：November 1999
• 年：1999
• 卷：38
• 期：11
• 页码：4213 - 4219
• 全文大小：125K
• 年卷期：v.38,no.11(November 1999)
• ISSN：1520-5045

文摘

Detoxification of water containing chlorinated aromatic compounds is performed in a single fixedbed using a periodic sequence of three steps: transient adsorption, catalytic hydrogenation, andthermal regeneration. The solid is both the adsorbent (activated carbon) and the catalyst (2.6%ruthenium loading). For chlorophenols, the end products are cyclohexanol and sodium chloridediluted in less than 2% of the amount of processed water. Adsorption is the critical step. Thewhole breakthrough curve is easily modeled. Conversely, the model fails to describe the earlybeginning which governs the purity of the effluent. The reaction step is performed under mildconditions (T < 353 K, P < 0.4 MPa) and is governed by the transient desorption of the pollutant,the catalytic reaction, and the mass-transfer processes. Thermal regeneration under hydrogenflow restores the adsorbent capacity and catalytic activity.