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Keras
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Apparently cyclopentane works as an entrainer to separate ethanol from a ternary ethanol/isopropanol/water mixture.
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draculic acid69
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Quote: Originally posted by Mateo_swe  | In Sweden we call homemade ethanol made for drinking "Hembrännt", hem=home, brännt=brewed, distilled.
In my youth i had a stainless distiller rig with 20L capacity.
I made the "Mäsk" with turboyeast + common sugar in 25L pails, it took 4-5 days something to be ready for the distiller.
After distilling, diluting to 40% and purification by activated coal it tastes almost nothing, just a warmth in the chest.
Way better than store bought vodka.
The secret to very good homemade ethanol is the quality of the activated coal.
I still have the stainless distilling rig somewhere but it hasnt been used for 15-20 years.
Maybe i could start using it for making absolute ethanol.
But how to get rid of the last 5% water, molecular sieves? |
Here in Oz we also call it home brew.as for the last 5% use dehydrated cuso4
or mgso4 but not calcium salts as they dissolve in etOH.
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Fery
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here I found this interesting info:
https://www.researchgate.net/post/What-is-the-most-appropria...
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Simplest classical method - reflux with CaO (BaO), distillation and susequent preparation of magnesium ethylate and reflux over them (to achive
absolute alcohol).
At pressure below 70Torr, ethanol do not build azeothrope with water, so it can be distilled in relative pure form - this conditions are very
attractive to room temperature pervaporation.
To avoid relative complex magnesium ethylate prep-step, absolutization can be performed by standing over 3A molecular sieves.
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Has anyone tried the distillation below 70 Torr? I expect coil condenser and suitable cooling liquid necessary (for example ethylene glycol or at
least very concentrated salty solution like CaCl2 or NH4NO3). Seems to be suitable experiment for winter time (to cool the cooling liquid somewhere
outside during freezing winter temperatures). I expect water aspirator would be preferred as a vacuum source (through which a water with temperature
above 0 C must circulate of course) because a rotary oil vacuum pump would create too low vacuum level and would require even much more colder cooling
liquid.
[Edited on 11-9-2021 by Fery]
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S.C. Wack
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The question is how many theoretical plates will be required to separate such a mixture with a 16-17C difference in bp to better than 95.6% purity,
and how many one's setup/hands has at 70 mm. This method is not left out of lab manuals by accident.
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