Ethylene separation cold zone
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At what temperature does the cryogenic tank reach before the nitrogen oxides inside it explode, or in other words, what kind of accident could cause the nitrogen oxides in the cryogenic tank to explode?
The lowest temperature in the cryogenic tank of the ethylene plant is around -170°C. Diazonium compounds are highly reactive chemically; during shutdowns for maintenance, as the temperature in the cryogenic tank rises, if these compounds are not completely removed, there is a risk of spontaneous explosion. Previously, an explosion occurred in a cold box of an ethylene plant abroad. You can search for it by yourself
If an ethylene plant or propylene plant experiences an emergency shutdown and can be restarted in a short time, is it necessary to promptly vent the tanks between sections of the cryogenic tank as well as the hydrogen tanks to the flare?