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公开(公告)号：US4654441A
公开(公告)日：1987-03-31
申请号：US265550
申请日：1981-05-20
IPC分类号： A23K50/15 , C07C273/18 , C07C275/62 , C07C127/24
CPC分类号： C07C273/1881 , A23K50/15
摘要： Process for the production of technical grade biuret, readily in a form suitable for use as animal feed, by the controlled pyrolysis of urea in two stages, the first stage involving the partial pyrolysis of urea at a temperature above the melting point of urea to produce a first stage intermediate reaction product containing from about 20% to about 60% urea, and not more than about 25% cyanuric acid by weight, such reaction product being then cooled and comminuted, the comminuted product then being subjected, in solid form and in the absence of a liquid carrier, to a temperature at or slightly below the softening point of the solid particulate (suitable at a temperature of from about 100.degree. C. to about 140.degree. C.) with forced air circulation through the comminuted product for a sufficient time to lower its urea content by partial sublimation of the urea and partial further reaction thereof to biuret with only minimal further conversion of urea to cyanuric acid. Crystallization and cooling of the molten intermediate product resulting from the first stage of pyrolyzation is advantageously accelerated by addition thereof of a powdered seed material, preferably including powdered feed grade biuret from a previous run, which additive serves to also increase the melting point of the product and thus increase the temperature at which it may be heated during the solid state pyrolyzation.
摘要翻译： 用于生产技术级缩二脲的方法，容易以适合用作动物饲料的形式，通过尿素在两个阶段的受控热解，第一阶段涉及在高于尿素熔点的温度下部分热解尿素以产生 含有按重量计约20％至约60％尿素和不多于约25％氰尿酸的第一级中间反应产物，然后将该反应产物冷却并粉碎，然后将粉碎产物以固体形式和 不存在液体载体，达到或稍低于固体颗粒的软化点的温度（适合于约100℃至约140℃），强制空气通过粉碎产品循环通过粉碎产物 有足够的时间通过尿素的部分升华来降低其尿素含量，并且其部分进一步的反应转化为缩二脲，只有尿素进一步转化成三聚氰酸。 由第一阶段热解产生的熔融中间体产物的结晶和冷却有利地通过加入粉末种子材料来加速，优选包括来自之前的流程的粉末状进料级缩二脲，该添加剂还用于增加产物的熔点 并且因此在固态热解期间增加其可被加热的温度。
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