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Korean Journal of Chemical Engineering

, Volume 22, Issue 6, pp 882–888 | Cite as

Kinetic analysis for decomposition of 2,4-dichlorophenol by supercritical water oxidation

  • Hyeon-Cheol Lee
  • Jung-Hyun In
  • Jong-Hwa Kim
  • Kyung-Yub Hwang
  • Chang-Ha Lee
Article

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 °C, 230–280 bar and 0.074-0.221 mol/L H2O2. The effect of oxidant concentration on decomposition rate and efficiency was significant near the critical temperature of 380 °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 ring-opening products.

Key words

2,4-Dichlorophenol (2,4-DCP) Supercritical Water Oxidation (SCWO) Kinetic Rate 

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Copyright information

© Korean Institute of Chemical Engineering 2005

Authors and Affiliations

  • Hyeon-Cheol Lee
    • 1
  • Jung-Hyun In
    • 1
  • Jong-Hwa Kim
    • 1
  • Kyung-Yub Hwang
    • 1
    • 2
  • Chang-Ha Lee
    • 1
  1. 1.Department of Chemical EngineeringYonsei UniversitySeoulKorea
  2. 2.Water Environment & Remediation Research CenterKorea Institute of Science & TechnologySeoulKorea

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