motrin
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Iodine extraction from brine
Does anyone know the name of the process used to extract Iodine from seawater?
It was mentioned in Wikipedia and I've yet to find any further info on it.
I've UTFSE and all articles either just mention it in passing or refer to the "Iodine is mined as sodium iodate(V), NaIO3, which is present
in Chile saltpetre. It is obtained by reaction with sodium hydrogensulfite."
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Eliteforum
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Why not just buy it?
All that glitters isn't gold.
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motrin
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I most likely will buy it, if and when I need some, but I have this strange interest in chemistry and chemical processes.
It makes me want to know things and maybe, if possible, to try things. I've heard they have a term for people like me. Just can't recall it
offhand.
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Mr. Wizard
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Does anyone want the scanned version of the history of the DOW Chemical company? They made their money using chlorine from brines and got their first
big 'product'; Bromine from brines. It was used as a water purification agent during a typhoid or cholera epidemic. Sales were brisk and the
product was compact and easily transported. The bromine and iodine were isolated by using a reverse flow of chlorine through a rain of the brine
containing small amounts of the other halogens. The oxidized halogens were carried upstream against the flow of the feed brine. The big point of the
book was the fact DOW used tar covered wood as the construction material for the plant, thus saving big money. I think I just talked myself out of
scanning it. One other point; the brine was obtained from wells, not the ocean. The chlorine was from electrolysis of the brine.
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The_Davster
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| Quote: | Originally posted by Eliteforum
Why not just buy it? |
Iodine will get you on the DEA's(or similar agency in other countries) "list".
Kinda off-topic but, dont bother trying to extract iodine from iodized salt, or sea salt by bubbling chlorine through. Essentially zero yield. Even
when a chlorinated hydrocarbon is mixed in, there is no evidence that suports I2 being formed. Did this reaction before I realized how small 0.01%
actualy is.
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Tacho
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Iodine is obtained from seaweed.
The percentage of iodine in seawater is too low to be extracted! In fact, seawater has even gold dissolved in it, but only few molecules per cubic
meter.
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Eliteforum
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| Quote: |
Iodine will get you on the DEA's(or similar agency in other countries) "list".
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I can buy it by the pound without anything looking fishy.
If you wish to purchase some, drop me a PM.
All that glitters isn't gold.
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Saerynide
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I think shipping it to him might be a problem.
Why not extract it from tincture or povidone iodine? Rhodium's site talks about extracting from tincture and from povidone iodine
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Esplosivo
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Actually there is another small thread discussing the extraction of iodine from an aqueous solution.
http://www.sciencemadness.org/talk/viewthread.php?tid=1626
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quest
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| Quote: | Originally posted by Tacho
Iodine is obtained from seaweed. |
How can you get Iodine from seaweeds?
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Esplosivo
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A basic extraction from seaweed requires large quantities of seaweed. The seaweed is first burnt, and the ash remaining is collected. This ash
contains iodine in the form of iodide (mostly as KI), which can be oxidized to Iodine and sublimed to extract it from the mixture.
For more info about Iodine reactions imp. in its extraction see:
http://www.ucc.ie/ucc/depts/chem/dolchem/html/elem/elem053.h...
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quest
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can I use any seaweed I can get?
or there is a specific seaweed?
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Esplosivo
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Are you seriously going to extract iodine from seaweed?! I hope it is just for research or something since if you intend to obtain large quantities of
iodine you will not have much luck.
I have heard about the seaweed Laminaria digitata (hope I've got it right). It should contain one of the highest Iodine concentrations
found in seaweed. It contains around 3400 mg/lt of weed homogenate. Working out the loss due to experimental errors and the sort you should realize
that you will use up much more precious H2SO4 for the extraction.
Other seaweeds do contain iodine but in varying concentrations.
Here is a pic to help you recognize the seaweed of you really intend to extract the iodine from Laminaria digitata:
[Edited on 30-3-2004 by Esplosivo]
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The_Davster
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| Quote: | Originally posted by Saerynide
I think shipping it to him might be a problem.
Why not extract it from tincture or povidone iodine? Rhodium's site talks about extracting from tincture and from povidone iodine |
Most likely shipping would be a problem, I am in western Canada. Saerynide, I have tried that first link a while ago with pretty good sucess,
however instead of using 4 bottles of 5% I used 1 bottle of 2.5%(makes me glad I have a 0.8mL pipet) I still got a pile of iodine about the size of a
nickel.
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Esplosivo
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| Quote: |
Does anyone want the scanned version of the history of the DOW Chemical company? They made their money using chlorine from brines and got their first
big 'product'; Bromine from brines
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I would surely like a copy of the book. It would be interesting to extract bromine from brines. I've read about it, and I it would be nice to try
something out.
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t_Pyro
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Here is the relevant section (taken from "Concise Inorganic Chemistry", J.D. Lee) on iodine extraction from brine:
<img src=http://img34.photobucket.com/albums/v104/T_Pyro/Iodine-extraction-1.gif>
<img src=http://img34.photobucket.com/albums/v104/T_Pyro/Iodine-extraction-2.gif>
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Mr. Wizard
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I'll dig out the History of DOW chemical and start the job.
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