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Author: Subject: Rotary evaporator
jack33
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[*] posted on 19-10-2013 at 14:07
Rotary evaporator


Hello,

Can you add a vigreux column to a rotovap set up and do a fractionate distillation?A rotovap looks like a regular distillation set up except the evaporating flask is rotate so i guess it could be possible but i heard you cant use it to purify a liquid.

Thanks
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Pyro
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[*] posted on 19-10-2013 at 14:12


If you very accurately controlled the temp. of the water bath you could distill something.
But where would you put the vigreux column?




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Dariusrussell
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[*] posted on 19-10-2013 at 14:17


I think you will run into significant issues attatching a decently sized vigreux as it would snap.
Would this be done under vacuum like a usual rotovap?
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jack33
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[*] posted on 19-10-2013 at 15:26


I would put it above the evaporating flask but not on the same side(i would rest the receiving flask on a stand) or vertically below the condenser.
I would use a vacuum and a thermometer too.
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kristofvagyok
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[*] posted on 19-10-2013 at 15:27


Quote: Originally posted by jack33  
Can you add a vigreux column to a rotovap set up and do a fractionate distillation?


No, no, no and no. Rotavap is for removing volatile solvents, if you would like to do a distillation, than do it properly.




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bfesser
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19-10-2013 at 15:57
Dariusrussell
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[*] posted on 19-10-2013 at 16:50


Alternatively... If you have a rotovap and you don't want to get more glassware and it can be put on a steep angle you could make it work without the roto, and evap; using it just as a distillation setup(1). But if you have a rotovap you should be able to get the rest of a vacuum fractionating setup.

(1) I highly don't recommend it though.

[Edited on 20-10-2013 by Dariusrussell]
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Mush
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[*] posted on 10-2-2015 at 14:51


Would it be a good good bargain?

http://www.ebay.ie/itm/Rotary-Evaporator-RE52C-0-25-2L-Verti...

http://www.aliexpress.com/store/product/Rotary-Evaporator-RE...
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Zombie
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[*] posted on 10-2-2015 at 15:57


In a few minutes of looking, the same unit is 899.00 USD on Ebay. The next price point seems to be $2,000.00, and up.

That said, I did find one sans glass for $199.99 plus 70.00 shipping... (used)
http://www.ebay.com/itm/Yamato-RE-51-RE51-Rotary-Evaporator-...




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smaerd
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[*] posted on 10-2-2015 at 17:14


It's a good deal if you can find the glass for a decent price.



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