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Title: Rate enhancement by cations in supercritical water oxidation of 2-chlorophenol

Abstract

Interactions between cations and Cl species in the supercritical water oxidation (SCWO) of 2-chlorophenol (2CP) has been investigated in a high-pressure quartz-lined reactor at 673--773 K. Experimentally, the authors found that the S/D ratio (defined as the amount of 2CP converted to CO{sub 2} and H{sub 2}O/disappearance of 2CP) for SCWO of 2CP was enhanced by cations. The S/D ratio increased as the charge density of cations increased. Due to the extremely low solubility of metal salts in the supercritical water, abstraction of Cl in 2CP via an intermediate was postulated. Formation of these metal chloride precipitates in the SCWO of 2CP were identified by X-ray diffraction (XRD) spectroscopy. Since the formation of toxic highly chlorinated phenols and heavy polycyclic aromatic hydrocarbons (PAHs) was notably reduced, abstraction of Cl of 2CP by cations may occur in the early stage of the SCWO process.

Authors:
;  [1]
  1. National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Environmental Engineering
Publication Date:
OSTI Identifier:
687363
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 18; Other Information: PBD: 15 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; CHLORINATED AROMATIC HYDROCARBONS; POLYCYCLIC AROMATIC HYDROCARBONS; SUPERCRITICAL STATE; CATIONS; WASTE WATER; WASTE PROCESSING; INDUSTRIAL WASTES; OXIDATION

Citation Formats

Lin, K.S., and Wang, H.P. Rate enhancement by cations in supercritical water oxidation of 2-chlorophenol. United States: N. p., 1999. Web. doi:10.1021/es981316y.
Lin, K.S., & Wang, H.P. Rate enhancement by cations in supercritical water oxidation of 2-chlorophenol. United States. doi:10.1021/es981316y.
Lin, K.S., and Wang, H.P. Wed . "Rate enhancement by cations in supercritical water oxidation of 2-chlorophenol". United States. doi:10.1021/es981316y.
@article{osti_687363,
title = {Rate enhancement by cations in supercritical water oxidation of 2-chlorophenol},
author = {Lin, K.S. and Wang, H.P.},
abstractNote = {Interactions between cations and Cl species in the supercritical water oxidation (SCWO) of 2-chlorophenol (2CP) has been investigated in a high-pressure quartz-lined reactor at 673--773 K. Experimentally, the authors found that the S/D ratio (defined as the amount of 2CP converted to CO{sub 2} and H{sub 2}O/disappearance of 2CP) for SCWO of 2CP was enhanced by cations. The S/D ratio increased as the charge density of cations increased. Due to the extremely low solubility of metal salts in the supercritical water, abstraction of Cl in 2CP via an intermediate was postulated. Formation of these metal chloride precipitates in the SCWO of 2CP were identified by X-ray diffraction (XRD) spectroscopy. Since the formation of toxic highly chlorinated phenols and heavy polycyclic aromatic hydrocarbons (PAHs) was notably reduced, abstraction of Cl of 2CP by cations may occur in the early stage of the SCWO process.},
doi = {10.1021/es981316y},
journal = {Environmental Science and Technology},
number = 18,
volume = 33,
place = {United States},
year = {1999},
month = {9}
}