Hilski
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Effectiveness of hexane as a solvent for benzaldehyde.
I need to use a different solvent for extracting benzaldehyde from an inorganic oxidizer in H2SO4. Toluene has been used, but it's hard to get all of
it out of the oxidizer mix, and it ends up getting converted to benzoic acid during the electrolytic regeneration process. That in itself is not a
huge problem, but I would still like to avoid it if possible.
I was thinking of using hexane since it is inert (like ether etc), because of it's low boiling point compared to toluene, and most importantly,
because I already have a bunch of it. I can't think of any reason that it shouldn't be OK to use, but I thought I would come here and ask first just
to be sure, before I start dumping in. I know it's more flammable than toluene, but other than that I can't think of any reason not to use it. Any
comment or suggestions welcome.
Hilski
\"They that can give up essential liberty
to obtain a little temporary safety
deserve neither liberty nor safety. \"
- Benjamin Franklin
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Furch
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IIRC benzaldehyde is miscible with oils and petroleum ether of all boiling ranges, including hexane.
- Furch
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bio2
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It will work fine but has maybe half the dissolving power
as benzene or toluene so use more.
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Sauron
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petroleum ether of whatever range you want is fine and cheaper than hexane but if you have it at hand already, fine.
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Lambda
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@Uncle Fester has given extensive coverage of the "Pipe Bomb" H2SO4/Chromate ?/Perchromate ? Toluene oxidation process in his book(s): (Advanced)
Amphetamine Manufacture. Both of his Amphetamine books can be found via @Madhatter's FTP services. Here he also explains the extraction process that
may be of interest to you.
Furthermore:
Chromic and Perchromic acid is known to react Explosively with many Solvents, so extreme caution is a priority.
Useful information:
Both volumes of Bretherik's Handbooks can also be found via Madhatter's FTP services. Maybe the link to these books that I wants had given via this
forum still work (?). In these books you will be able to find much info on incompatibilities of Chromic/Perchromic acid systems.
Regards,
Lambda.
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Hilski
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| Quote: | It will work fine but has maybe half the dissolving power
as benzene or toluene so use more.
--------------------------------------------------------
Chromic and Perchromic acid is known to react Explosively with many Solvents, so extreme caution is a priority. |
Those are the sorts of things I was wondering about. I am using a manganese compound as the oxidizer as opposed to chromic acid, and it is reduced by
the toluene from an alum to a sulphate during the reaction. It loses most of it's strong oxidizing properties, so hopefully there will be no reaction
with the hexane.
Thanks for all the replies.
Hilski
[Edited on 22-1-2007 by Hilski]
\"They that can give up essential liberty
to obtain a little temporary safety
deserve neither liberty nor safety. \"
- Benjamin Franklin
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bio2
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Hexanes are about as inert as it gets.
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chemrox
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What about "deodorized" mineral solvent? Isn't this hardware store stuff basically ligroine? mixed alkanes?
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