DCHAS-L Discussion List Archive

I have some questions about last month's AHF lecture bottle explosion.

The Air Products Safety Bulletin (July 12, 2000) at this link

 http://www.airproducts.com/Responsibility/EHS/ProductSafety/ProductSafetyInformation/safety_bulletins_PotentialPressurization.htm

recommends venting excess pressure to an acceptable scrubber or disposal 
system.  It is HF they are referring to of course (but the majority of 
the gas would be H2).

I asked the folks at Air Products about an acceptable scrubbing media.  
They recommended a solid media impregnated with KOH.   They don't sell 
the material but pointed me to a company called Purafil.  Here is 
Purafil's website:   http://www.purafil.com/

Purafil recommends a product called Puracarb media.  This is an 
activated carbon and activated alumina mixture.  The activated carbon is 
impregnated with KOH.  It is sold as a bulk material as opposed to being 
packaged in a cartridge or cannister.  Does anyone have experience with 
this media?  I'd be interested in any feedback you may have including 
the set up (e.g., plumbing , etc.) used to vent the gas through the sorbent.

Since the initial email came out in mid July/05 has anyone vented any 
AHF cylinders? Can you provide details? How did you scrub the gas? 

One final question (somewhat academic) - is Iron (II) fluoride or Iron 
(III) fluoride produced from the reaction of HF with the iron in the 
cylinder wall? 

Thanks

Larry