关键词: phenol;aniline;nitrobenzene;supercritical water oxidation;chemical oxygen demand

Abstract: Some aromatic compounds, phenol, aniline and nitrobenzene, were oxidized in supercritical
water. It was experimentally found that the chemical oxygen demand (COD) removal efficiency
of these organic compounds can achieve a high level more than 90% in a short residence time
at temperatures high enough. As temperature, pressure and residence time increase, the COD
removal efficiencies of the organic compounds would all increase. It is also found that
temperature and residence time offer greater influences on the oxidation process than
pressure. The difficulty in oxidizing these three compounds is in the order of nitrobenzene
＞ aniline ＞ Phenol. In addition, it is extremely difficult to oxidize aniline and
nitrobenzene to CO2 and H2O at the temperature lower than 873.15 K and 923.15 K,
respectively. Only at the temperature higher than 873.15 K and 923.15 K, respectively, the
COD removal efficiencies of 90% of aniline and nitrobenzene can be achieved.

Key words: phenol, aniline, nitrobenzene, supercritical water oxidation, chemical oxygen demand