METHOD AND APPARATUS FOR PREPARING HYDRAZO-DICARBONAMIDE USING UREA AS STARTING MATERIAL
摘要
The present invention relates to a method and apparatus for preparing hydrazodicarbonamide using urea as starting material economically and environmentally desirably. The apparatus includes a pyrolysis furnace to obtain biuret and ammonia by pyrolyzing urea; a recrystallization reactor to purify the biuret obtained from the pyrolysis furnace; a first reactor to obtain an metal monohalobiuret salt by reacting the biuret with metal hypohalogen compound or with halogen and base; a second reactor to synthesize the hydrazodicarbonamide by reacting the monohalobiuret metal salt with ammonia; and an ammonia evaporator to separate the excess ammonia from hydrazodicarbonamide and to supply the separated ammonia to an ammonia concentrator.
申请公布号
WO03035601(A1)
申请公布日期
2003.05.01
申请号
WO2001KR01796
申请日期
2001.10.24
申请人
J & J CHEMICAL CO., LTD.;LEE, CHUN-HYUK;HAN, SANG-JIN