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Fyndium
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I indeed posted about this on another topic, but for the record, activated carbon granules have worked for me for everything I've used them so far,
from acetone, ethanol, styrene to sulfuric acid. I used them also in vacuum distillation as an accidental impurity, and was glad I did because the
bleeder tube was clogged and I had to draw a new head, but the liquid still boiled perfectly smoothly.
I have never gotten acetone bump on me before, but it did happen. Apparently too clean glassware and distilled and filtered acetone solution was too
pure for any nucleation to occur.
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wg48temp9
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If you want to know how good your boiling stones are let the flask or beaker boil vigorously for a few minutes then let it cool until all the boiling
stops for a few minutes then reheat the flask slowly. Porous boiling stones not flooded with the liquid will stop bumping as before but plain glass
and smooth glass balls probably will not.
The porous boiling stones when they contain air act like lots of small capillary tubes releasing small bubbles of gas that prevent bumping much more
efficiently then any smooth glass.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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Sulaiman
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I have recently been doing a lot of EtOH distillations and for boiling stones I have been using these
STONES, from the garden - they work really well giving a stable rolling boil.
Borosilicate glass is harder than Marble and so far no signs of scratching
CAUTION : Hobby Chemist, not Professional or even Amateur
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pneumatician
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I distil a lot of wine & EtOH and NEVER put anything in the flask, no bumping. You put too much heat power???? Use allways the lower heat
necessary, you will save yourself a lot of trouble.
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Sulaiman
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I guess that you are doing simple distillations only, with no fractionating column?
(or possibly a poor fractionating column such as a Vigreux)
CAUTION : Hobby Chemist, not Professional or even Amateur
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pneumatician
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Quote: Originally posted by Sulaiman  |
I guess that you are doing simple distillations only, with no fractionating column?
(or possibly a poor fractionating column such as a Vigreux) |
I use in second and + distil a Vigreux of 30cm.
this guy say: from 40% to 95% EtOH in a step.
https://vimeo.com/170121935
[Edited on 4-9-2020 by pneumatician]
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Sulaiman
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I seriously doubt that he got 95% from 40% with that configuration.
CAUTION : Hobby Chemist, not Professional or even Amateur
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pneumatician
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me too, :-) however next time i will try to see how that is
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pneumatician
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https://www.sciencemadness.org/whisper/viewthread.php?tid=64...
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Fyndium
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It took me a while to realize that the boiling chip element is absolutely crucial for efficient and smooth boiling for pretty much any liquid.
Sometimes I got bumping so hard it effectively prevented distillation, including vacuum. The take-off rate seems to be also much higher, and even
using small equipment a steady stream of liquid can be condensed, instead of drops. I've distilled 240C boiling liquids under vacuum with
stream-takeoff rate.
Activated carbon.
That's the magic stuff. It pretty much always works. A teaspoon of granules in any liquid will make it go very smooth, producing an intense curtain of
bubbles. A fresh load is required for every batch, including if the liquid is cooled down, as it seems that the carbon absorbs liquid and stops
working.
Under no circumstances can carbon added to hot or boiling liquid. It will flash boil and blow out of the vessel. Always add it to cold
liquid.
It is likely that any activated carbon will work as well. These are from brewing shop, size 2-3mm granules if I remember right.
Distillation of 110C boiling liquid:
Vacuum distillation of 240C boiling liquid:
[Edited on 6-3-2021 by Fyndium]
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