Title:
尿素を合成するための改良された方法
Document Type and Number:
Japanese Patent JP5378361
Kind Code:
B2
Abstract:
An enhanced process is described for the synthesis of urea from ammonia and carbon dioxide, at a high pressure and temperature, with the formation of ammonium carbamate as intermediate, which includes a high pressure synthesis section, comprising at least one separation step by decomposition-stripping with ammonia of the non-converted ammonium carbamate, carried out in a vertical apparatus, commonly called stripper, characterized in that said step also comprises a feeding, in the lower part of said stripper, of a stream of CO2, heated to a temperature ranging from 130 to 230° C., in a quantity of 1 to 15% by weight with respect to the total weight of the fresh CO2 fed to the process, containing a passivating agent in such a quantity that its equivalent content of O2 in moles varies from 0.05% to 0.80% with respect to the moles of CO2 of said stream.
Inventors:
Carlessino
Gianza Alessandro
Gianza Alessandro
Application Number:
JP2010508743A
Publication Date:
December 25, 2013
Filing Date:
May 19, 2008
Export Citation:
Assignee:
SAIPEM S.P.A.
International Classes:
C07C273/04; C07C275/02
Domestic Patent References:
| JP2002145850A | ||||
| JP57046954A |
Attorney, Agent or Firm:
Sadao Kumakura
Nobuo Ogawa
Atsushi Hakoda
Kenji Asai
Kazuo Yamazaki
Shimura
Nobuo Ogawa
Atsushi Hakoda
Kenji Asai
Kazuo Yamazaki
Shimura