To remove hydrazine contained in steam to such a level that the environment and human body are not adversely affected by bringing the hydrazine-contg. steam into contact with a specified catalyst.
Hydrazine-contg. steam is passed through a catalytic layer of a catalyst contg. one or more kinds of substances selected from among Cu, Fe, Zn, Co, Mo, Ir, Ni, Mn, Cr, Pd, Ag and Pt, compds. of these metals such as oxides, nitrates and chlorides, zeolite, alumina, 'Helipack (R)', 'Raching Ring (R)' and Dickson packing and the hydrazine is decomposed with the catalyst. When the catalyst is powder, it is compacted by tabletting, extrusion or other method. In order to stably maintain the catalyst for a long time, air or oxygen is added to the hydrazine-contg. steam and the hydrazine is more effectively removed. Steam producing no harmful effect on the environment and human body is obtd.
JINBO TAKASHI
YASUTAKE TAKESHI
SHIMURA KAZUYA
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