An anti-corrosive reactor for the decomposition of halogenated hydrocarbons with supercritical water oxidation

Hyeon Cheol Lee, Jung Hyun In, Sang Young Lee, Jong Hwa Kim, Chang Ha Lee

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

An anti-corrosive reactor was studied, which decomposes halogenated organic compounds by way of supercritical water oxidation (SCWO). Two different types of SCWO reactor were used: a floating type reactor using a non-porous ceramic tube and a transpiring wall-type SCWO reactor using a porous ceramic tube. Reactor configurations were evaluated to protect a SCWO system from corrosion, due to halogenated hydrocarbon oxidation, and fouling, due to salt formation from the neutralizing agent. At various operating conditions (340-440 °C, 250-300 bar) and concentrations (300-3000 mg 2,4-dichloropenol/L), the system was operated to decompose 2,4-dichlorophenol (2,4-DCP) as a model compound with hydrogen peroxide (H2O2). Back-mixing led to corrosion of the injection part of the transpiring wall-type reactor. However, 2,4-DCP was successfully destroyed up to ≥99.99% without corrosion or fouling problems with a floating type SCWO system. As the range of the supercritical zone in the reactor was changed by the operating conditions, the conversion of 2,4-DCP increased with an increase in the reaction temperature and pressure. Therefore, residence time in the SCWO process played a key role in the decomposition efficiency of the developed system. Under the conditions of 420 °C, 250 bar and a 1 mL/min flow rate, 2,4-DCP at a concentration of 300 mg/L was completely converted using a stoichiometric amount of 100% of H2O2. In the case of 3000 mg/L of 2,4-DCP, complete conversion was observed under the conditions of 440 °C, 250 bar and with over 200% of H2O 2 supply. The floating type reactor, consisted of one vertical double-wall reactor including neutralization and cooling, was successfully operated for more than 5 months for SCWO of 2,4-DCP without corrosion and fouling.

Original languageEnglish
Pages (from-to)59-69
Number of pages11
JournalJournal of Supercritical Fluids
Volume36
Issue number1
DOIs
Publication statusPublished - 2005 Nov 1

Fingerprint

Halogenated Hydrocarbons
Caustics
hydrocarbons
reactors
Decomposition
decomposition
Oxidation
oxidation
Water
water
fouling
Fouling
corrosion
Corrosion
floating
ceramics
tubes
Organic compounds
Hydrogen peroxide
Hydrogen Peroxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Lee, Hyeon Cheol ; In, Jung Hyun ; Lee, Sang Young ; Kim, Jong Hwa ; Lee, Chang Ha. / An anti-corrosive reactor for the decomposition of halogenated hydrocarbons with supercritical water oxidation. In: Journal of Supercritical Fluids. 2005 ; Vol. 36, No. 1. pp. 59-69.
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abstract = "An anti-corrosive reactor was studied, which decomposes halogenated organic compounds by way of supercritical water oxidation (SCWO). Two different types of SCWO reactor were used: a floating type reactor using a non-porous ceramic tube and a transpiring wall-type SCWO reactor using a porous ceramic tube. Reactor configurations were evaluated to protect a SCWO system from corrosion, due to halogenated hydrocarbon oxidation, and fouling, due to salt formation from the neutralizing agent. At various operating conditions (340-440 °C, 250-300 bar) and concentrations (300-3000 mg 2,4-dichloropenol/L), the system was operated to decompose 2,4-dichlorophenol (2,4-DCP) as a model compound with hydrogen peroxide (H2O2). Back-mixing led to corrosion of the injection part of the transpiring wall-type reactor. However, 2,4-DCP was successfully destroyed up to ≥99.99{\%} without corrosion or fouling problems with a floating type SCWO system. As the range of the supercritical zone in the reactor was changed by the operating conditions, the conversion of 2,4-DCP increased with an increase in the reaction temperature and pressure. Therefore, residence time in the SCWO process played a key role in the decomposition efficiency of the developed system. Under the conditions of 420 °C, 250 bar and a 1 mL/min flow rate, 2,4-DCP at a concentration of 300 mg/L was completely converted using a stoichiometric amount of 100{\%} of H2O2. In the case of 3000 mg/L of 2,4-DCP, complete conversion was observed under the conditions of 440 °C, 250 bar and with over 200{\%} of H2O 2 supply. The floating type reactor, consisted of one vertical double-wall reactor including neutralization and cooling, was successfully operated for more than 5 months for SCWO of 2,4-DCP without corrosion and fouling.",
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An anti-corrosive reactor for the decomposition of halogenated hydrocarbons with supercritical water oxidation. / Lee, Hyeon Cheol; In, Jung Hyun; Lee, Sang Young; Kim, Jong Hwa; Lee, Chang Ha.

In: Journal of Supercritical Fluids, Vol. 36, No. 1, 01.11.2005, p. 59-69.

Research output: Contribution to journalArticle

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