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

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15 Citations (Scopus)

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 3 80-420 °C, 230-280 bar and 0.074-0.221 mol/L H 2O2. 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 ringopening products.

Original languageEnglish
Pages (from-to)882-888
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume22
Issue number6
DOIs
Publication statusPublished - 2005 Nov

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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