Title:
尿素の製造方法
Document Type and Number:
Japanese Patent JP7279020
Kind Code:
B2
Abstract:
[Solution] In a urea manufacturing plant, a method for manufacturing urea from manufacturing raw materials including NH3 and CO2, wherein the urea manufacturing plant includes a plurality of processing units including a reactor, a stripper and a condenser, and a plurality of lines, and the inner wall surfaces of the plurality of processing units and the plurality of lines are made of a stainless steel and at least some of the plurality of lines is made of an austenitic stainless steel, the urea manufacturing method including: forming a passivation film on the inner wall surfaces of the plurality of processing units and the plurality of lines by supplying CO2 of the manufacturing raw material with added oxygen; continuously measuring a wall thickness of the line made of the austenitic stainless steel; and adjusting a supply amount of the oxygen in response to a measurement value of the wall thickness to control a corrosion rate and a reaction yield of urea.
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Inventors:
Hidenori Nagashima
Application Number:
JP2020513226A
Publication Date:
May 22, 2023
Filing Date:
April 03, 2019
Export Citation:
Assignee:
Toyo Engineering Corporation
International Classes:
C07C273/04; C07C275/00
Domestic Patent References:
| JP2005249550A | ||||
| JP2004163250A |
Foreign References:
| WO2014192823A1 |
Other References:
遅沢 浩一郎,ステンレス鋼の特性と使用上の要点,腐食センターニュース,2009年01月,No.048,p1-18
Attorney, Agent or Firm:
Satoshi Furuya
Yoshitsune Kazumasa
Yoshitsune Kazumasa
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