Nitrogen filling issue in hydrochloric acid tank
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What are the benefits of filling a 35% hydrochloric acid tank with a small amount of nitrogen? How effective is it at suppressing the evaporation of acid mist?
Reduce the partial pressure of HCL in the air?
I can’t think of any purpose for filling it with nitrogen; is it to use the pressure from nitrogen to push the liquid out from the bottom?
No, although nitrogen is not technically an inert gas, it does not react with chemical raw materials. It also effectively isolates the materials to prevent damage caused by welding or other thermal processes. That’s why nitrogen is commonly used for protection purposes in such applications, a practice known as nitrogen sealing.
Nitrogen sealing has a protective effect on hydrochloric acid and hydrogen chloride, and it is not a flammable substance. Nitrogen can play a role similar to that of a filter in the event of a hydrogen chloride gas leak
Here, it is likely necessary to use nitrogen to control the pressure of the high-concentration hydrochloric acid storage tank. For hydrochloric acid storage tanks with a concentration of 31% or lower, a water seal at the top is sufficient to handle the exhaust gases. However, in this case the concentration is 35%, and the exhaust gas concentration is also high; therefore, a nitrogen seal is needed to control the pressure.
Since negative pressure exhaust pipes and vapor equilibrium vent pipes have already been installed, is it beneficial to add a small amount of nitrogen to suppress the evaporation of acid mist?
It cannot suppress volatilization; volatilization becomes even more severe