Title:
尿素合成方法および装置
Document Type and Number:
Japanese Patent JP4191879
Kind Code:
B2
Abstract:
Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column (1) and a stripper (21), 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 (1) to the top of a stripper (21). Carbon dioxide is introduced into the bottom of the stripper (21) 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 (1), where it is reacted with liquid ammonia injected into the bottom and a middle of the vertical condensation and synthesis column (1). 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 (1).
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Inventors:
Fukunaka Yufumi
Kenji Yoshimoto
Kenji Sakai
Yasuhiko Kojima
Kenji Yoshimoto
Kenji Sakai
Yasuhiko Kojima
Application Number:
JP2000202482A
Publication Date:
December 03, 2008
Filing Date:
July 04, 2000
Export Citation:
Assignee:
Toyo Engineering Corporation
International Classes:
C07C273/04; B01D5/00; B01J10/00; B01J19/00; C07B63/00; C07C273/16; C07C275/00
Domestic Patent References:
| JP10182587A | ||||
| JP11180942A |
Attorney, Agent or Firm:
Akio Miyazaki
Nobuyuki Kaneda
Ishibashi Masayuki
Nobuyuki Kaneda
Ishibashi Masayuki