| 摘要 |
PURPOSE: A method for synthesizing semi-carbazide is provided which reduces manufacturing unit cost and provides excellent reaction efficiency and manufacturing yield by using cheap raw materials instead of using expensive hydrazine. CONSTITUTION: The semi-carbazide is synthesized by the reaction of halogenated urea and ammonia, and is represented by the following reaction formula (3) wherein, X is a halogen atom selected from chlorine, fluorine, bromine and iodine. In the method, the reaction is carried out at a temperature of 50-170 deg.C, the reaction mol of the ammonia is 1-1,000 times as that of the halogenated urea, the ammonia is ammonia gas, liquid ammonia or ammonia in aqueous solution, and the reaction solvent is a mixture solvent of water and a second solvent.
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