公开(公告)号：US4154760A

公开(公告)日：1979-05-15

申请号：US763148

申请日：1977-01-27

申请人： Eiji Otsuka ,  Shinji Yoshimura ,  Kazumichi Kanai ,  Shigeru Inoue

发明人： Eiji Otsuka ,  Shinji Yoshimura ,  Kazumichi Kanai ,  Shigeru Inoue

IPC分类号： C07C273/04 ,  C07C126/02

CPC分类号： C07C273/04

摘要： A urea synthesis process for converting ammonia and carbon dioxide to urea is improved by providing an easy means of maintaining the urea synthesis zone in the process at a constant temperature. In the process the starting CO.sub.2 and up to and including 100 percent of the starting NH.sub.3 are reacted in a heat-recovery zone maintained at a urea synthesis pressure. Some of the heat of reaction is removed. The molar ratio of NH.sub.3 to CO.sub.2 which is fed into the heat-recovery zone is less than 4. The reaction mixture and the rest of the starting NH.sub.3 are fed into a urea synthesis zone maintained at urea synthesis pressure to produce urea. The improvement involves adjusting the amount of starting ammonia which is fed into the urea synthesis zone in response to any change in the temperature in the urea synthesis zone so that the urea synthesis zone is maintained at a substantially fixed temperature.

摘要翻译： 通过提供将过程中的尿素合成区保持在恒定温度的简单方法，可以改善将氨和二氧化碳转化为尿素的尿素合成方法。 在该过程中，起始CO 2和直到并包括100％的起始NH 3在保持在尿素合成压力的热回收区中反应。 一些反应热被去除。 进料到热回收区中的NH 3与CO 2的摩尔比小于4.将反应混合物和其余的起始NH 3进料到维持尿素合成压力的尿素合成区中以产生尿素。 改进之处在于响应于尿素合成区中温度的任何变化而调节进入尿素合成区的起始氨的量，使得尿素合成区保持在基本上固定的温度。