Hi all, working on a task where HF acid gas may be present due to Li-ion battery combustion (faulty batteries, over-changing, transport/vibration) in a container. Curious how one would design a filter or neutralize this gas in order to lessen damage to humans and surroundings? I imagine this may be a chemical engineering question, which I have no experience with. Thank you!
This can help you to know about thi gas abatment:
https://www.oregon.gov/deq/FilterDocs/IntelFluorideAQreport.pdf
The filters containing sodium hydroxide or lime The pH neutralization of hydrofluoric acid is conventional and any inorganic base such as sodium hydroxide or lime can be used. Hydrofluoric acid is a one normal solution which means that for each mole of HF one mole of H+ or acid is liberated requiring one mole of hydroxide (OH-) to neutralize.
. Oxidation and Dry Scrubbing (This approach to controlling Fluoride emissions involves more complete oxidation of the fluoride compounds to HF followed by dry sorbent injection, where the sorbent material is collected in a fabric bag house)
2. Modified Packed‐Bed Wet Scrubber(, Fluorides can also be treated using a two‐stage wet scrubber by adding a reducing agent such as sodium sulphite to ultimately remove fluorine compounds in the scrubbing section as sodium fluoride.) One mole of sodium hydroxide (NaOH) is required to neutralize one mole of HF , as follows:
NaOH + HF → NaF + H20
Conversely one mole of lime as Ca(OH)2 will neutralize two moles of HF which is a common reaction in industrial fluoride reduction for the precipitation of fluorides as a relatively insoluble CaF2 salt:
Ca(OH)2 + 2HF → CaF2 + 2H20
When we want to trap hydrogen fluoride on a filter in order to estimate its concentration in the atmosphere we use filters soaked with sodium carbonate. I think you could try to adapt this method to your issue. You can see an exmple of the use of this method here:
Article Exposure to fluorides in the French phosphate fertilizer industry
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