stainless steel and fluoboric acid
stainless steel and fluoboric acid
(OP)
Is 316L suitable for overhead piping for brief low concentrations of steam distilled fluoboric acid?
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stainless steel and fluoboric acid
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RE: stainless steel and fluoboric acid
RE: stainless steel and fluoboric acid
HBF4, borofluoric acid, hydrofluoboric acid
RE: stainless steel and fluoboric acid
316 is listed (by the nickel development institute) as ok for boric acid at all temps in my chart. (20C->100C)
316 is listed (same source) as Not Recommended for Hydrofluoric acid at any temp.
so my SWAG (see this thread for the definition of SWAG Thread1010-120615) is that I wouldn't use it.
nick
RE: stainless steel and fluoboric acid
One of the MSDS's that popped up when I ran a search on hydrofluboric acid said that the product decomposed to HF and BF3 before reaching it's normal boiling point. The HF will eat into the stainless in a big hurry and BF3 is a pretty nasty gas that will be leaking out of the holes. 316L is a bad choice for this project. You need a metal that can withstand HF. I am not sure what metal that is off the top of my head but 316L is not the right choice.
Regards
StoneCold
RE: stainless steel and fluoboric acid
We never used HBF4 or it's salts in metal equipment.
We received most of the chemical in poly drums and our tanks were polyethylene and polypropylene. The pumps were Teflon or Tefzel lined. The heaters and coolers were the Teflon spaghetti type. We had an induced vent system over the tanks.
We used a lot of Kynar and polypropylene piping.
Here is source of Kynar piping.
http://www.fabtechinc.com/table01.html
If not proprietary information what is the MOC of the distillation equipment?
RE: stainless steel and fluoboric acid