通过系列对比实验,研究了弱碱性条件下,丁酮连氮与弱碱性物质A反应制取联二脲的过程中酮连氮与弱碱性物质A投料之比、水解温度、时间、洗水温度、pH值等影响产物收率的各种因素。计算出反应最佳投料比。水解过程中pH值过高时通过加入少量酸性物质调节至弱碱性。弱碱性条件下生产的联二脲避免了酸性条件下水解缩合反应中产生的大量含酸废水,使ADC发泡剂的生产过程更趋于对环境友好。 A series of comparative experiments were carried out to study the effects of the ratio of ketazine to weakly basic material A on the reaction of butanone with nitrogen and weakly basic material A in the preparation of biuret under mild alkaline conditions. The hydrolysis temperature, time, Washing temperature, pH and other factors affect the yield of the product. Calculate the best response to the feed ratio. During hydrolysis, the pH is adjusted to weakly basic by adding a small amount of acid. The biuret produced under weak alkaline conditions avoids the large amount of acid-containing waste water generated during the hydrolysis condensation reaction under acidic conditions, making the production process of ADC blowing agent more environmentally friendly.