发明授权
- 专利标题: Urea synthesis process and apparatus
- 专利标题(中): 尿素合成工艺及装置
-
申请号: US09897967申请日: 2001-07-05
-
公开(公告)号: US06476262B2公开(公告)日: 2002-11-05
- 发明人: Tadashi Fukunaka , Kenji Yoshimoto , Kenji Sakai , Yasuhiko Kojima
- 申请人: Tadashi Fukunaka , Kenji Yoshimoto , Kenji Sakai , Yasuhiko Kojima
- 优先权: JP2000-202482 20000704
- 主分类号: C07C27300
- IPC分类号: C07C27300
摘要:
Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. The urea synthesis solution is transferred from the top of the vertical condensation and synthesis column to the top of a stripper. Carbon dioxide is introduced into the bottom of the stripper and contacted with the urea synthesis solution, thereby separating the unreacted ammonia and the unreacted carbon dioxide from the urea, and providing a mixed gas comprising ammonia, carbon dioxide and water. The mixed gas is transferred into the bottom of the vertical condensation and synthesis column, where it is reacted with liquid ammonia injected into the bottom and a middle of the vertical condensation and synthesis column. The mixed gas and liquid ammonia are condensed and react to form urea, Uncondensed gases are absorbed in an absorbing medium, which is subsequently recycled to the bottom of the vertical condensation and synthesis column.
公开/授权文献
- US20020004612A1 Urea synthesis process and appratus 公开/授权日:2002-01-10