Acid mist is appearing at the exhaust outlet of the hydrochloric acid storage tank
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I have a question for everyone here in Sichuan: in cold weather or when it’s raining, acid mist often appears at the exhaust vents of hydrochloric acid storage tanks. I’d like to know how to solve this problem
In fact, acid mist is present on normal days as well; it’s just not visible. On rainy days, when the air humidity is high, gaseous hydrochloric acid is absorbed by the small water droplets in the air, resulting in acid mist. If there is a high level of acid mist, use an exhaust pipe to vent it and have water absorb it.
Treated with a simple absorption tower.
It’s hydrogen chloride gas that evaporates; when it comes into contact with moisture in the air, it condenses into small hydrochloric acid droplets, giving the appearance of fog. It is irritating to the human body. It is best to add a breathing valve or alkaline water for absorption.
A small spray device is generally installed at the exhaust outlet of the hydrochloric acid tank to absorb the volatile hydrogen chloride gas
Acid mist contains acidic corrosive substances that can pollute the environment and harm human health; in accordance with environmental protection regulations, it must be treated to meet specified standards before being released. At present, many companies have not treated it and have discharged it directly. The simplest approach is to use aqueous NaOH as the absorbent; a small absorption tank is placed at the outlet, where the liquid is absorbed before being discharged again, and the alkali solution is replaced depending on the pH value. As for many descriptions of absorption tower systems, I believe that volatilization from storage tanks is minimal, so it’s not necessary.
Agree with the suggestion from floor 8. Our company uses liquid caustic for absorption.
We added an acid mist recycler, but it doesn’t seem to be very effective