Title:
尿素製造方法および装置
Document Type and Number:
Japanese Patent JP7088770
Kind Code:
B2
Abstract:
There is provided a process and an apparatus for urea production in which preheating of raw material ammonia or heating in a medium-pressure decomposition step can be performed at a relatively low pressure while preventing decrease in an overall heat transfer coefficient. A process for urea production includes: a synthesis step of generating a urea synthesis solution; a high-pressure decomposition step of heating the urea synthesis solution to separate a gaseous mixture containing ammonia and carbon dioxide from the urea synthesis solution; a condensation step of condensing the gaseous mixture; a medium-low-pressure steam generation step of reducing a pressure of medium-pressure steam condensate obtained in the high-pressure decomposition step to a medium-low pressure to generate medium-low-pressure steam and medium-low-pressure steam condensate; and one or both of a medium-pressure decomposition step and an ammonia preheating step. In the medium-pressure decomposition step, the urea synthesis solution that has been processed in the high-pressure decomposition step is heated at a pressure lower than a pressure in the high-pressure decomposition step by using the medium-low-pressure steam as a heat source. In the ammonia preheating step, the ammonia to be supplied to the synthesis step is heated by using the medium-low-pressure steam as a heat source.
More Like This:
Inventors:
Kenji Yoshimoto
Kei Sasaki
Kei Sasaki
Application Number:
JP2018140072A
Publication Date:
June 21, 2022
Filing Date:
July 26, 2018
Export Citation:
Assignee:
Toyo Engineering Corporation
International Classes:
C07C273/04; C07C275/00
Domestic Patent References:
| JP61010547A | ||||
| JP10182587A | ||||
| JP52068129A |
Foreign References:
| WO2017043391A1 | ||||
| WO2017043390A1 |
Attorney, Agent or Firm:
Akio Miyazaki
Masaaki Ogata
Masaaki Ogata