Sumitomo Chemical Company, Limited

Hiroyuki Nishikawa

Shinkichi Shimizu

Tatsuo Shiraishi

Sachio Oishi

Hiroshi Fukusen

Tetsu Wakabayashi

The process involves stripping ammonium nitrogens and organic materials, as gases, which are present in process waste waters to be discharged from plants wherein gases for use in ammonia synthesis are manufactured by reforming hydrocarbons with steam, decomposing the organic materials selectively in the presence of a catalyst at a temperature of about 120.degree. to 400.degree. C., mixing the remaining gases with the flue gases from said plants so as to provide a gaseous mixture having ammonia therein in an amount of about 0.3 to 10 moles per mole of nitrogen oxides present in the flue gases, reacting the gaseous mixture over a catalyst at a temperature of about 150.degree. to 700.degree. C. and oxidizing the unreacted ammonia, if any, in the presence of a catalyst at a temperature of about 150.degree. to 700.degree. C. to render the nocuous substances innocuous.

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Niihama, Japan

Hiroyuki Nishikawa