What is the reason for the decrease in sodium nitrite in triamine molten salts?
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Recently, the concentration of sodium nitrite in the company’s triamine molten salt has decreased, along with its melting point. Could anyone help analyze the reasons for this? There have been no changes in the manufacturing process, nor has there been any change in the use of nitrogen gas to cover the molten salt tank.
It’s impossible for nothing to change; it’s just possible that you haven’t noticed any changes. Check whether the temperature display is accurate, the purity of N2, and whether O2 has mixed in.
When molten salts are used at high temperatures (>460°C), they oxidize, resulting in a decrease in the NaNO2 content and an increase in the melting point； >Significant thermal decomposition occurs at 550°C: 5NaNO2→3NaNO3+Na2O+N2↑
It is estimated that the nitrogen concentration has decreased; check whether there is air mixed in the nitrogen pipeline
No matter how tightly sealed they are, compounds that contain the character \"yi\" are inherently unstable. With such high temperatures, redox reactions occur, and it’s normal for them to deteriorate and decrease in quantity; simply replenishing them regularly is sufficient
There are two reasons: one is oxidation due to impure nitrogen, and the other is overheating, as sodium nitrite turns into sodium nitrate at high temperatures above 450 degrees.