DCHAS-L Discussion List Archive
Date: Thu, 25 Aug 2005 10:53:11 -0700
Reply-To: "Larry D. McLouth" <LDMcLouth**At_Symbol_Here**LBL.GOV>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Larry D. McLouth" <LDMcLouth**At_Symbol_Here**LBL.GOV>
Organization: Lawrence Berkeley National Laboratory
Subject: AHF Lecture Bottle Explosion Redux
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
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