Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Kinetic Analysis for Decomposition of 2,4-Dichlorophenol by Supercritical Water Oxidation

  • Lee, Hyeon-Cheol (Department of Chemical Engineering, Yonsei University) ;
  • In, Jung-Hyun (Department of Chemical Engineering, Yonsei University) ;
  • Kim, Jong-Hwa (Department of Chemical Engineering, Yonsei University) ;
  • Hwang, Kyung-Yub (Water Environment & Remediation Research Center, Korea Institute of Science & Technology) ;
  • Lee, Chang-Ha (Department of Chemical Engineering, Yonsei University)
  • Published : 2005.11.01
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Abstract

2,4-Dichlorophenol (2,4-DCP), as a halogenated model pollutant, was decomposed by using supercritical water oxidation (SCWO) in a batch reactor made of Hastelloy C-276. SCWO experiments for 2,4-DCP decomposition were performed in the range of 380-$420^{\circ}C$, 230-280 bar and 0.074-0.221 mol/L $H_2O_2$. The effect of oxidant concentration on decomposition rate and efficiency was significant near the critical temperature of $380^{\circ}C$. However, the role of the oxidant concentration in the SCWO process decreased with an increase in temperature; also, excess oxidant played a key role in quite significantly decreasing the activation energy of 2,4-DCP oxidation. Variation of the reaction rate by the change of pressure was negligible even at a near critical temperature. The kinetic rate for the decomposition of 2,4-DCP in the SCWO process was well described by a simple first-order kinetic and global reaction rate model. From the SCWO experiments, the various intermediates identified with a GC/MS implied that the first reaction pathway for 2,4-DCP decomposition led to dimers such as dichlorophenoxyphenols, and the second led to single-ring and ringopening products.

Keywords

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