[Nhcoll-l] FW: use of air to bubble through ethanol to mix solutions.

[Haff, Tonya (NCMI, Crace)]

Hello all,

We typically use a fish bubbler to mix ETOH and water together when we mix up 70% ETOH. We are in the stages of planning a new building, and I recently got the below feedback about doing this - the dangerous goods consultant says that this has the risk of acidifying the solution, and that using N2 to mix the solution might be a better idea. Do any of you have thoughts on this? If so, I would really appreciate hearing them!

Cheers,

Tonya


Email:


As per our conversation last week, you mentioned that CSIRO plan on using air to bubble through their ethanol solutions to help mix the solution. Can you please confirm if this is correct with CSIRO?

Normally when you mix/bubble air through ethanol solutions, you may run the risk of oxidation of the ethanol, although this reaction is very slow, you may generate some acetylaldehyde and eventually ethanoic acid.

Can you confirm with CSIRO if using nitrogen is better? This would still help mix the solutions and would have the added benefit of degassing the ethanol by removing dissolved oxygen from the solution. This long term, would help minimise the risk of oxidation of the ethanol and generation of acetylaldehyde and eventually ethanoic acid.


Regards
Paulo Da Silva

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Dr Paulo Da Silva
PhD, BSc(Hons), M.RACI, M.AIDGC,
NABERS Accredited Assessor
Principal Consultant - Dangerous Goods

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