METHOD FOR PRODUCING UREA

WIPO Patent Application WO/2019/198600

A1

[Problem] To provide a method for producing urea that curbs corrosion of a urea plant and increases the reaction yield. [Solution] A method for producing urea from raw production materials including NH3 and CO2 at a urea production plant, wherein: the urea production plant comprises a plurality of treatment devices including a reactor, a stripper, and a condenser, as well as a plurality of lines; inner wall surfaces of the plurality of treatment devices and the plurality of lines are made of stainless steel; at least some of the plurality of lines are made of austenitic stainless steel; and the urea production method comprises supplying oxygen added to CO2, which is a raw production material, thereby forming a passive film on the inner wall surfaces of the plurality of treatment devices and of the plurality of lines, and continuously measuring the thickness of the lines made of austenitic stainless steel and adjusting the amount of oxygen supplied in accordance with the measurement values for thickness, thereby controlling the rate of corrosion and the urea reaction yield.

JP6949693	Treatment method and treatment equipment for aqueous solutions containing urea, ammonia and carbon dioxide
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JPS6133160	PRODUCTION OF UREA

NAGASHIMA EIKI (JP)
TAKAHASHI MASASHI (JP)

PCT/JP2019/014847

October 17, 2019

April 03, 2019

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TOYO ENGINEERING CORP (JP)

C07C273/04; C07C275/00; C23F15/00

WO2014192823A1

2014-12-04

JP2005249550A	2005-09-15
JP2004163250A	2004-06-10

OSOZAWA KOICHIRO: "Characteristics of Stainless Steel and Main Issues in Regard to Its Use", CORROSION CENTER NEWS, vol. 48, January 2009 (2009-01-01), pages 1 - 18

FURUYA Satoshi (JP)

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