Pyro
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liquifying Cl2 for I2Cl6
hello,
I was wondering how one would effectively condense chlorine gas to a liquid?
a simple gas generator that leads to an erlenmeyer that is submerged in liquid nitrogen.
BP of Cl2= -34.04*C
temp. of liquid nitrogen= -195.79
I can easily get liquid nitrogen via my mother who is a chef.
the Chlorine gas should condense immediately to a solid, after letting the chlorine melt again at room temp, and add a stociometrical shortage of I2.
then after it reacts let the excess chlorine evaporate. what is left should be I2O6.
what do you think about this approach?
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Fossil
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Dry ice (-78c) is really all you need to condense chlorine. Liquid nitrogen is a little extreme in my opinion.
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Pyro
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liquid nitrogen is easier for me to get, they use it in kitchens
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woelen
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You do not even need to liquefy the chlorine, simply pass dry chlorine gas over I2. First the I2 seems to melt, but in reality it reacts with Cl2,
forming liquid ICl. If you continue passing Cl2 over it, then it is converted to ICl3 (is this really I2Cl6?). It is hard though to keep ICl3. It very
easily looses a molecule of Cl2, making ICl again. I once made a sample, which was yellow like sulphur, but after some time it turned brown again and
partially liquefied. The brown material is ICl, which also gives a brown vapor, much like Br2, but somewhat less red, more brown like milk chocolate.
[Edited on 22-8-12 by woelen]
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Pyro
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that might be a possibility, but i was under the impression that the I2 needed to be liquid. but isn't it better to add the I2 to the Cl2, with Cl2 in
excess. then the Cl2 will evaporate leaving pure I2Cl6
and why is it so expensive? 450 eur/100g according to:
http://www.hinmeijer.nl/product/124815/Joodtrichloride_99_.a...
if I were to react 1/2 mole of I2 with 3/2 moles of Cl2 It would cost me: 126g of I2=18EUR, 105g Cl2=+-10EUR
and that would theoretically give me 231g I2Cl6. of course I don't need nearly that much
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woelen
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The price of chemicals is not only determined by the price of its precursors. In fact, in many cases the cost of precursors hardly has any relation
with the price of the chemical. The effort, needed to make the chemical, the storage requirements, the way of packaging it and how it is transported
from factory to seller to reseller to customer, all of these things add to the price.
As I mentioned before, ICl3 (I2Cl6) is not an easy thing to keep around. It must be stored under a Cl2 atmosphere. Keeping it in contact with air very
quickly causes it to loose Cl2 and ICl remains behind. So, as you suggest, just keeping it in air to allow excess Cl2 to evaporate is no option,
you'll loose too much Cl2. You really need to store it in an atmosphere of Cl2. For this reason it usually is ampouled and once the ampoule is broken
it deteriorates quickly.
In my opinion, ICl3 is not a chemical for a home lab. You can make a small quantity as a curiousity item and do some experiments with it immediately
after its preparation, but making a large amount and keeping that around will be a disappointment.
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Pyro
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that's what I meant to do  thanks!
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AndersHoveland
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Of course, you should be sure that the Cl2 gas is completely free from moisture; the typical method is to pass it through finely crushed CaCl2 powder
that has been baked dry. The chlorine coming out of a typical chlorine generator contains a considerable ammount of moisture, which is likely to make
your reaction problematic.
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Pyro
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better not take that advice, its bad
lol, it is good, i will use a gas washing bottle.
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