Michael,
Usually a dryice/IP-alcohol bath under your reciever
is sufficient. It'll freeze the TFA and then you can
simply dilute it out with water (straight add'n to the
solid TFA) to get rid of it via your normal acidic
waste route.
If you're using a prep/pilot sized rotary evaporator,
a dryice/IP-alcohol trap in the line between your
apparatus end the pump should be sufficient.
I have used this method with cocktails that contain
thiol scavengers as well and it seems to keep the
"smellies" in check.
As far as the Ca(OH)2 trap, yeah nice but a real pain
to clean for something that doesn't really need it
like HF would.
Regards,
Steven Johnson B.S.Chem.
Biomeasure, Inc. Milford MA
--- "Breslav, Michael [PRI]" <MBreslav@prius.jnj.com>
wrote:
> Greetings,
> I need to evaporate a lot of TFA at a high rate and
> for safety reasons I am
> looking for a chemical trap in addition to a cold
> trap. Peptides
> International sell trap and teflon that can be
> mixed with Ca(OH)2. This is
> designed for trapping HF, but hopefully will work
> for TFA. Any other advice
> based on your experience?
> Thanks,
> Michael Breslav
> R.W.Johnson PRI
> Spring House, PA
>
>
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