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Author: Subject: Boiling Stones?
Fyndium
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[*] posted on 2-9-2020 at 11:04


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.

ezgif-7-49a7e5d58940.gif - 2.6MB

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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[*] posted on 2-9-2020 at 12:39


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.




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Sulaiman
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[*] posted on 2-9-2020 at 16:42


I have recently been doing a lot of EtOH distillations and for boiling stones I have been using these

stones.jpg - 136kB

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




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pneumatician
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[*] posted on 3-9-2020 at 07:12


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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[*] posted on 3-9-2020 at 14:57


Quote: Originally posted by pneumatician  
I distil a lot of wine & EtOH and NEVER put anything in the flask, no bumping.

I guess that you are doing simple distillations only, with no fractionating column?
(or possibly a poor fractionating column such as a Vigreux)




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[*] posted on 3-9-2020 at 16:47


Quote: Originally posted by Sulaiman  
Quote: Originally posted by pneumatician  
I distil a lot of wine & EtOH and NEVER put anything in the flask, no bumping.

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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[*] posted on 4-9-2020 at 06:10


Quote: Originally posted by pneumatician  

this guy say: from 40% to 95% EtOH in a step.

I seriously doubt that he got 95% from 40% with that configuration.




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[*] posted on 4-9-2020 at 06:31


Quote: Originally posted by Sulaiman  
Quote: Originally posted by pneumatician  

this guy say: from 40% to 95% EtOH in a step.

I seriously doubt that he got 95% from 40% with that configuration.


me too, :-) however next time i will try to see how that is
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[*] posted on 17-9-2020 at 14:16


https://www.sciencemadness.org/whisper/viewthread.php?tid=64...
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