碳酰肼的合成

Synthesis of carbohydrazide

优化了低温两步法合成碳酰肼的工艺条件,结果表明:肼基甲酸甲酯的合成工艺条件为:加入过量的水合肼,温度70℃,时间2 h,肼基甲酸甲酯收率为85.5%.碳酰肼的合成:当n(水合肼)∶n(肼基甲酸甲酯)=2.5∶1.0时,温度75℃,时间4 h,效果最优,碳酰肼收率为82.2%.

The better preparation for making carbohydrazide was dealt with, in a two step at low temperature. It was shown that the yield of methoxycarbonylhydrazine of hydrazine hydrate is 85.5% in the optimal operation conditions that reaction temperature is 70℃, reaction time is 2 h and excessive hydrazine hydrate is added. The yield of carbohydrazide is 82.2% in the following conditions： n （hydrazine hydrate） ： n（methoxycarbonylhydrazine） is 2.5 ： 1, reaction temperature is 75 ℃ and reaction time is 4 h.