organicchemist25
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Vigreux and reflux column combo. Custom piece
I bought this off of someone. It looked like something I wanted to add to the collection. He couldn't tell me what it is used for.
One side has a vigreux column and on the other side a coiled reflux condenser, but they are connected to were one could bypass over to the other side?
Please explain where this could be used.
[Edited on 4-11-2017 by organicchemist25]
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DJF90
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I can't think of any possible use for this. From my perspective, it is nonsensical and certainly can't be used for fractionation.
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Sulaiman
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I think that it is a molecular discombobulator, that could be used on a movie set
CAUTION : Hobby Chemist, not Professional or even Amateur
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unionised
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Have you ever looked up the origin of the word "fiasco"?
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organicchemist25
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Yeah, I don't know either, but it came from a university's previous collection. The craftsmanship in the joints, coil, vigreux, thickness of the
glass and fusion of the two parts is of professional quality. I'm sure it could be used for some odd application. I just have no idea what. I can't
foresee someone making it for no reason.
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organicchemist25
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I did after you mentioned it. 
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markx
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Could be used as a stillhead with regulated reflux ratio (on top of another packed column. If one attaches a needle valve (or any other valve that
allows for a fine regulation) at the bottom of the reflux condenser outlet to force the major part of the condensate to overflow and return to the
main column via the lower connection arm, then you have a glass stillhead with regulated reflux ratio. A peculiar design nevertheless....
Exact science is a figment of imagination.......
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Dr.Bob
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Might have allowed mixtures of solvents to be distilled, the higher boiling fractions went the lower short path, the lower ones take the high road.
That idea makes as much sense as any other I can come up with.
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BromicAcid
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Quote: Originally posted by Dr.Bob  | Might have allowed mixtures of solvents to be distilled, the higher boiling fractions went the lower short path, the lower ones take the high road.
That idea makes as much sense as any other I can come up with.
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Yes, I have seen something similar. The condenser is set cooler than the condenser on the top of the Vigreux column so that it can collect the
'lights' fraction while the heavy can collect on the top finger.
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j_sum1
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So, BromicAcid, it is basically a fractionating column with the ability to add a reflux condenser to the top. And the condenser to the side is
designed to remove some of the light material from the reaction mixture. Presumably it also removes a good portion of the heavy as well.
I was trying to visualise what the pressure gradient might be like in the unit and figured that if the side condenser was cooler then more
condensation would happen there which would then lower the pressure and cause more of the vapour to be sucked in that direction.
It strikes me as the sort of equipment that, if it was doing exactly what you wanted and was separating the desired fraction, it would be great. But
it could be a fickle bastard to work with. I would have guessed better progress might have been made with a Dean Stark -- assuming of course that
there was some kind of phase separation of the condensate.
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BromicAcid
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That would be my best guess based on a similar setup I saw before.
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