100% ethanol

[Spirit]

There are several ways to dry ethanol, mainly geared toward fuel production. However they all seem to use chemicals of unknown toxicity. I would like to find a non toxic way to do this to make a better solvent for extracting super dry herbs. My research so far points to table salt, but that seems to apply to isopropyl, not ethanol. Or does it? If you know how to do this, please let me know.

[juana_b]

viewtopic.php?t=86497

[still_stirrin]

There are several ways to dry ethanol, mainly geared toward fuel production. However they all seem to use chemicals of unknown toxicity. I would like to find a non toxic way to do this to make a better solvent for extracting super dry herbs. My research so far points to table salt, but that seems to apply to isopropyl, not ethanol. Or does it? If you know how to do this, please let me know.

It requires a desiccant because H2O forms an azeotrope above 95.63ABV purity. And as such, the water is “laced” into the alcohol molecule and does not easily un-bond. It can be done in a laboratory, but the cost to do it outweighs the benefits.

Why not simply use some azeotropic ethanol to do your “spice” decoction? It’ll work just as well and it will still evaporate from the residue left in your recovery flask.
ss

[Saltbush Bill]

Why not simply use some azeotropic ethanol to do your “spice” decoction?

SS, Google Tannox Still, the OP is running one of those "modified" I think........doubt it's capable of Azeo.

[Spirit]

Why not simply use some azeotropic ethanol to do your “spice” decoction?

SS, Google Tannox Still, the OP is running one of those "modified" I think........doubt it's capable of Azeo.

Yes, I installed a refluxer at the top of the column of the 3 gallon Tannox. The very first usable output after discarding methanol/foreshot is 95%. By keeping the refluxer temp turned down, I continue to collect 92% for the remainder of the run. This is possible by running low boiling power and going slow. I extract almost all alcohol from the wash. My production is more a drip drip than a drip drip spurt. So I'm pretty sure my distillate is dryable.

[Spirit]

viewtopic.php?t=86497

Thanks juana_b. I have some of those pearls in my amazon cart. If this works, I will post back.

[still_stirrin]

Spirit,

Here’s a good read for producing anhydrous ethanol:

8374471.pdf

Clean Ethanol

(790.77 KiB) Downloaded 115 times

Have fun with it.
ss

[Renhoekk]

TBH you’re wasting your time. 100% ethanol doesn’t stay at 100% unless it is bottled and stored in a special way, usually under pressure and flushed with nitrogen to drive out any air from the completely air-tight storage vessel. That vessel also has a means of transferring the ethanol for use without exposing it to air.

This is because pure ethanol will quickly suck out water from the surrounding atmosphere, and it won’t stay pure for long

[renedox]

I used 3a molecular sieves to get my (~3L) collection of the first 100mL or so of spirit runs to a higher abv. Just because I can and to see if it works.

It did work but like a previous poster said, once you get above azeotrope, it'll drop back down over time if not stored correctly.

[LWTCS]

TBH you’re wasting your time. 100% ethanol doesn’t stay at 100% unless it is bottled and stored in a special way, usually under pressure and flushed with nitrogen to drive out any air from the completely air-tight storage vessel. That vessel also has a means of transferring the ethanol for use without exposing it to air.

This is because pure ethanol will quickly suck out water from the surrounding atmosphere, and it won’t stay pure for long

100%
Seen it first hand down here in the humid sub-tropics.