Title:
尿素製造方法および装置
Document Type and Number:
Japanese Patent JP7252365
Kind Code:
B2
Abstract:
In a urea synthesis process, temperature distribution in a submerged condenser is reduced. The process includes: synthesizing urea from NH3 and CO2 to generate a urea synthesis solution; by heating the solution, decomposing ammonium carbamate and separating a gaseous mixture containing NH3 and CO2 from the solution to obtain a solution higher in urea concentration than the solution obtained in the synthesizing; with use of a submerged condenser including a shell and tube heat exchange structure including a U-tube, absorbing and condensing at least a part of the gaseous mixture in an absorption medium on a shell side, and generating steam on a tube side with use of heat generated during the condensation; and recycling at least a part of liquid, obtained from the shell side, to the synthesizing, wherein water is supplied to the tube side of the condenser at a mass flow rate that is three times or more of the steam generation rate.
Inventors:
Kei Sasaki
Application Number:
JP2021550054A
Publication Date:
April 04, 2023
Filing Date:
March 14, 2019
Export Citation:
Assignee:
Toyo Engineering Corporation
International Classes:
C07C273/04; C07C275/00
Domestic Patent References:
| JP2006335653A |
Foreign References:
| WO2006118071A1 |
Attorney, Agent or Firm:
Akio Miyazaki
Masaaki Ogata
Masaaki Ogata