Blind Angel
National Hazard
Posts: 845
Registered: 24-11-2002
Location: Québec
Member Is Offline
Mood: Meh!
|
|
Iodine Extraction from a Aqueous Solution
I just bought 1 liter of Iodine in aqueous solution @ 0.1M (for 90$CAN) ans i was wondering if it was possible to extract it to have crystal iodine,
or if i'm better to leave it in solution. I know that i can't simply boil of the liquid or let it evaporate due to Iodine low sublimation
point.
I would also like to know if 90$ for 12,6g (i suppose) of iodine is a good price.
|
|
|
Mumbles
Hazard to Others
Posts: 436
Registered: 12-3-2003
Location: US
Member Is Offline
Mood: Procrastinating
|
|
There is always the boil the solution with cold finger method. Basically just fill a bowl with ice and place over the boiling solution to collect the
crystals.
That price is pretty horrible. One can buy a pound for C$140 from Canada. The guy seemed very nice and helpful when I procured something else from
him. It's roughly C$7.15 a gram for what you have. I've seen it going for C$7 an ounce. This was not a bad purchase by all means though.
If you want to mass produce it I would recomend a better source however.
|
|
|
Hermes_Trismegistus
National Hazard
Posts: 602
Registered: 27-11-2003
Location: Greece, Ancient
Member Is Offline
Mood: conformation:ga
|
|
90 BUCKS FOR TWELVE GRAMS!!!
| Quote: | Originally posted by Blind Angel
I just bought 1 liter of Iodine in aqueous solution @ 0.1M (for 90$CAN) ans i was wondering if it was possible to extract it to have crystal iodine,
or if i'm better to leave it in solution. I know that i can't simply boil of the liquid or let it evaporate due to Iodine low sublimation
point.
I would also like to know if 90$ for 12,6g (i suppose) of iodine is a good price. |
Are you on dope???
Arguing on the internet is like running in the special olympics; even if you win: you\'re still retarded.
|
|
|
thunderfvck
Hazard to Others
Posts: 347
Registered: 30-1-2004
Location: noitacoL
Member Is Offline
Mood: No Mood
|
|
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=38019...
Shitty. Anyway you can get a refund? I hope you still have your receipt and it hasn't been opened....
|
|
|
hodges
National Hazard
Posts: 525
Registered: 17-12-2003
Location: Midwest
Member Is Offline
|
|
Al-Chymist sells potassium iodide for $45 a pound. Most of that is iodine, and not too difficult to extract (depending what you are trying to use it
for).
|
|
|
fritz
Harmless
Posts: 49
Registered: 29-11-2003
Member Is Offline
Mood: No Mood
|
|
add some lye (e.g. NaOH) to your I2-solution. You will get a solution of iodide (and some hypoiodide or iodate). Add some sulfite (or bubble SO2
through the solution) to reduce all hypoiodide/iodate to iodide. Evaporate to dryness. You now have relatively pure iodide. This you may put into a
distilling-appartus add some sulfuric acid and MnO2 and heat. What comes over should be pure(of course this is not p.A. quality!!) solid iodine.
|
|
|
Geomancer
Hazard to Others
Posts: 228
Registered: 21-12-2003
Member Is Offline
Mood: No Mood
|
|
Fritz, I'm not sure I understand the purpose of adding alkali. Is that the hypoiodite reacts faster? When I make iodine from tincture, I reduce
it first (so as to remove excess water and alcohol). I used metals (both zinc dust and aluminum foil/HCl work), but your favorite reagent will
probably work.
|
|
|
thefips
Harmless
Posts: 33
Registered: 6-3-2004
Location: Germany
Member Is Offline
Mood: self destructive 
|
|
Just take an organic solvent,which is not soluable in water.Then mix it and let the phases seperate.The organic phase sholud be yellow.This is the
colour of the iodine.After another 2 or 3 extractions most of the iodine should be extracted.If you take a solvent with low boiling point,you can
easily get the iodine by boiling(or distilling) off the solvent and you get the iodine crystals.If you want very clean iodine,you can heat it and the
crystals will grow at cool surfaces.
|
|
|
Blind Angel
National Hazard
Posts: 845
Registered: 24-11-2002
Location: Québec
Member Is Offline
Mood: Meh!
|
|
Sorry if i didn't answer before i was in vacation, anyway, i fear that boiling off the liquid will also sublime the iodine thus lossing a lot of
it.
/}/_//|//) /-\\/|//¬/=/_
My PGP Key Fingerprint: D4EA A609 55E4 7ADD 8529 359D D6E2 33F6 4C76 78ED |
|
|
vulture
Forum Gatekeeper
Posts: 3330
Registered: 25-5-2002
Location: France
Member Is Offline
Mood: No Mood
|
|
I was distilling a mixture of toluene and I2 today and ALOT of I2 made it's way up to the top of the vigreux column, it's a bitch to
separate.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
|
|
|
Esplosivo
Hazard to Others
Posts: 491
Registered: 7-2-2004
Location: Mediterranean
Member Is Offline
Mood: Quantized
|
|
The iodine tincture I obtain contains I2 / KI / EtOH / water. Time ago I extracted Iodine from it. I added KMnO4 solution (acidified) to the tincture
so to oxidize the KI to Iodine. The mixture was then heated in a sort of 'cold-finger' apparatus I had made myself. Quite a lot of I2
formed, though if you need somewhat large quantities I suggest you buy it.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
