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Dry IPA / Acetone without the use of expensive epsom salts? Options
 
Purges
#1 Posted : 8/9/2012 9:41:28 AM

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It just occurred to me that we are trying to get all the excess water out of the IPA / Acetone when doing this. The common method is to stick some epsom salts in the oven, add to the solvent, shake for a bit and strain, which is all fine and dandy...

...But why not just put the solvent in the freezer for a day or 2, wait for the water to freeze, and strain from the non frozen solvent? Seems like and easy and free alternative to me. Any reason this wouldn't work?
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Infundibulum
#2 Posted : 8/9/2012 10:47:55 AM

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You're referring to something called cold distillation, or the freezing of water out of water/alcohol mixtures. With such a method you can remove enough water to take a, say, 10% alcohol solution to ~50%, but not really much higher.

The more you decrease the water in your solvent/water system the more difficult it is for water to partition out and crystallise. Which, in simple words means that freezing water out of IPA/acetone does not work.

Nice thinking though!




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Pup Tentacle
#3 Posted : 8/9/2012 3:06:15 PM

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I've been using silica gel cat litter. Seems to work well if you grind it to powder in a coffee grinder and then filter it out.
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Mister_Niles
#4 Posted : 8/9/2012 4:03:35 PM

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Expensive? You can get them for less than a dollar a pound. That's not very expensive.
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The Day Tripper
#5 Posted : 8/10/2012 2:08:46 AM

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Yeah, and usually whatever sulfate desiccant you are using (magnesium/sodium/etc), can be dehydrated and used again. Just bake it at 400f for an hour or two and it will dehydrate back into an annhydrous state. You could spend $10 and never have to buy magnesium/sodium sulfate again doing it this way.
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Kash
#6 Posted : 8/10/2012 4:54:06 AM

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Or if you are too impatient to dry your salts in the oven, you can microwave them and watch all the water absorbed boil away in under 5 minutes.
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benzyme
#7 Posted : 8/10/2012 5:07:38 AM

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when did epsom salt become expensive? you can get a pound of it for a buck and some change from the grocery story/pharmacy.
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mew
#8 Posted : 8/10/2012 9:22:17 AM

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Kash wrote:
Or if you are too impatient to dry your salts in the oven, you can microwave them and watch all the water absorbed boil away in under 5 minutes.



im super fond of this, it really expedites the process
 
Rivea
#9 Posted : 8/11/2012 5:13:57 AM

No.. that can't be...

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To me it seems that the Epsom salts is the cheapest item in this discussion. Getting good lab grade acetone (or almost any solvent) is more expensive by far. 91% isopropyl alcohol from the corner pharmacy is pretty cheap thought.
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Purges
#10 Posted : 8/11/2012 9:51:15 AM

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Well, for a moment there I thought I had a free alternative... Seems my logic was a little flawed, back to spending mega bucks on epsom salts them Wink
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Kash
#11 Posted : 8/14/2012 5:34:21 AM

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Mega bucks lol its cheap as hell at any pharmacy. Like 5$ for 3lbs where I find my epsom salts lol. I dont even recycle it and it lasts a long time.

Good effort though. If you dont want to spend money just dehydrate it after use Razz
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Yerba
#12 Posted : 8/14/2012 3:17:31 PM
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Also keep in mind that once the epsom salts are used, they can be re-purged in the oven.

Just make sure that any solvent traces have been given a day or so to evaporate with proper ventilation, unless you relish the idea of starting a fire in your kitchen.
 
 
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