GhostAliensFromMars
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Separating a mixture containing solvents and a dissolved solid that sublimes
Hi all
I have a small question regarding separation. If one had a mixture of different liquids containing a dissolved solid that sublimes when heated, could
distillation be used? I'm not sure if the solid would deposit inside the condenser and contaminate the different fractions. Has anyone attempted
anything similar to this?
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imidazole
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This sounds like a job for a cold finger, or some other form of trap for the solid, what exactly are you trying to do?
If you don't care about the solid, maybe a cotton block before your condenser would be enough to trap it, depending on what it is and how much.
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bnull
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What is in the mixture? There are physical processes and chemical processes that can be applied but, if we have no idea of the composition, albeit
approximate, we can't do better than a guessing game. Unfortunately, there is no one-size-fits-all process.
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GhostAliensFromMars
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Its made up of about 50% camphor dissolved in around 20%eugenol and 20% cineole. According to the MSDS the extra 10% is "non volatile terpinoids" The
goal is to remove the camphor to be left with eugenol and cineole. The terpinoids I do not care for
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DraconicAcid
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Eugenol can be removed with liquid-liquid extraction with sodium hydroxide.
You might have better luck separating the camphor and cineole using column chromatography.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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GhostAliensFromMars
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Hmm, thx for the ideas. Perhaps il just first stir the mixture with no heat and apply a vacuum to sublime out the camphor, filter and fractionally
distill the camphor free oil.
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chempyre235
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| Quote: |
Eucalyptol [cineole] forms crystalline adducts with hydrohalic acids, o-cresol, resorcinol, and phosphoric acid. Formation of these adducts is useful
for purification.
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https://en.wikipedia.org/wiki/Eucalyptol
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JackleApp
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Quote: Originally posted by GhostAliensFromMars  | Hmm, thx for the ideas. Perhaps il just first stir the mixture with no heat and apply a vacuum to sublime out the camphor, filter and fractionally
distill the camphor free oil.
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check what the BP or vapor pressure does at different reduced pressures. there are some things which cannot be seperated at atm but under even just
half vacuum go from 2-3C difference to 20C
a similar principle also exists for reduced pressure steam distillation but all i know is it exists, ive never bothered to try understanding it
because water at least prevents any sort of fractionation, it pulls everything with poor selectivity. steam distillation with alcohols or other
solvents yields different results. Might be worth looking into.
Another thing to try is, adding a solvent that dissolves one component radically more than the rest, may cause these substances to be less intimately
co-dissolved, allowing them to freeze precipitate out, maybe not at around zero as they would when pure, but -20, perhaps. if you remove enough you
get a sacrificial fraction worth discarding sometimes.
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