亜臨界および超臨界水酸化反応によるチオシアン酸イオンの分解

概要

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For the purpose of stable supply of energy while decreasing dependence of fossil fuels in the future, both clean coal technologies and environment load reduction technologies are extremely required to develop. For the development of clean-up system of sulfur-containing wastes from coal devoletilization process in coke oven, decomposition experiments of a thiocyanic ion, SCN^-, in sub- and supercritical water were examined with oxygen and hydrogen peroxide as oxidizers at temperatures from 25 to 400℃ and at 25MPa by a flow-through reactor. High-temperature water treatment in the presence of oxygen with O_2/SCN^- molar rario of 75 led to about 40% decomposition of SCN^- for 30s at 350℃. In contrast, the treatment in the presence of hydrogen peroxide with O_2/SCN^- molar rario of 30 led to complete decomposition of SCN^- for 30s at 200℃. It was found that decomposition ratio of SCN^- could be much improved with hydrogen peroxide as a oxidizer. These results show the clean-up system of sulfur-containing wastes can be made compact using sub- and supercritical water oxidation techniques.
2008-10-20