What causes the synthesis liquid in the urea synthesis tower to turn yellow?
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This post was last edited by 1025199692 on 2016-3-31 11:16. What causes the synthesis solution in the urea synthesis tower using the carbon dioxide stripping method to turn yellow?
Apart from yellowing, are there any changes in other indicators?
Are you in the coal chemical industry? Is dehydrodesulfurization working properly?
Does the color of the finished urea change?
Corrosion or introduction of sulfur? However, corrosion is usually somewhat reddish in color
The color of the finished urea is normal, the nickel content is within the specified range, and there are no other abnormalities; however, the liquid coming out of the synthesis tower sometimes turns yellow
Generally, it could be due to equipment corrosion; a thorough inspection is necessary. The analysis of nickel content may not be accurate – how reliable is a value of just a few ppm in a manufacturing facility? Check the sulfide content in carbon dioxide. It’s also possible that there is oil present in liquid ammonia or carbon dioxide