Mercedesbenzene
Hazard to Self
Posts: 64
Registered: 4-9-2011
Location: BC
Member Is Offline
Mood: Sub Zero
|
|
Scrubbing CO2 from welding argon
I want to synthesize 9,10-diphenylanthracene. It uses phenyllithium and must be conducted under an inert atmosphere. I don’t have nitrogen or pure
argon but I have a tank of welding argon that is 15% CO2 according to the MSDS. I want to try scrubbing out the CO2 with several sodium hydroxide
washes and then drying it over sodium hydroxide. I was wondering if anyone has any experience with this or has tried it before?
[Edited on 17-7-2012 by Mercedesbenzene]
|
|
|
DoctorOfPhilosophy
Hazard to Others
Posts: 130
Registered: 12-6-2012
Location: Ontario, Canada
Member Is Offline
Mood: enthralled
|
|
I don't know about other places, but at my local welding store they'll exchange Ar/CO2 for 99% Ar. Of course if you really need very pure Ar it's a
moot point. Scrubbing is going to be messy and contaminate your mix with water vapor, have you considered a cold trap?
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
is CO2 not inert enough for you?
it doesn't react with much
all above information is intellectual property of Pyro.  |
|
|
mr.crow
National Hazard
Posts: 884
Registered: 9-9-2009
Location: Canada
Member Is Offline
Mood: 0xFF
|
|
Phenyllithium will
Also CO2 will react with NaOH to make Na2CO3 for example (in solution it forms carbonic acid)
Double, double toil and trouble; Fire burn, and caldron bubble
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
oh,
I suggest trading in the bottle for pure argon, over here they have both pure and Ar/CO2 in many different sizes.
do you know of a welding shop in your area?
all above information is intellectual property of Pyro. |
|
|
Mercedesbenzene
Hazard to Self
Posts: 64
Registered: 4-9-2011
Location: BC
Member Is Offline
Mood: Sub Zero
|
|
For the sake of science I am going to try it on a very small scale. If it does not work then I will trade in my tank for a tank of 99% argon.
|
|
|
Gibberator
Harmless
Posts: 12
Registered: 19-6-2011
Location: BC
Member Is Offline
Mood: No Mood
|
|
Run it through an aqueous solution of CaNO3 or some other Alkaline Earth nitrate? Wouldn't it precipitate out as the Alkaline Earth carbonate?
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
