Reason for the whitening of concentrated sulfuric acid
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Concentrated sulfuric acid at 98% concentration (with normal color), after being left for a few days, its color becomes slightly cloudy and whitish. Peers in the acid production industry, has this phenomenon occurred? May I ask what the main reasons are?
Did some substances in the air react with concentrated sulfuric acid? What material is the equipment stored in?
First, it depends on the nature of the device you are storing it in. Second, aside from the device itself, there are natural factors such as water absorption and other such characteristics
Yes, but it’s not possible to analyze the amount of NOX or nitrate
Are the raw materials containing hyposulfurous acid, ferrous sulfate, or other organic substances?
This situation also exists in our production of acid from waste acid
Controlling the oxygen concentration results in the production of large amounts of elemental sulfur; keeping the oxygen concentration within the specified range means that nitrogen oxides will affect the quality of the acid, which is a challenging issue. At present, we have no good way to eliminate nitrogen oxides. Do any experts have good solutions?