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DMT freeze precip with dry ice?

E

elfdancer

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Joined
Dec 10, 2005
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517
I'm reading up DMT extraction techniques and had a question.

The freeze precipitation step calls for the DMT dissolved in naptha to be placed in a freezer to cause it to precipitate out. The reason this works is because the colder the naptha, the less DMT is soluble in it.

A question I have is, if one were to use a cooler full of dry ice, would this work better? Someone I spoke with theorized that it would cause the DMT to crystalize considerably faster than in a regular freezer, which should lead to better purity of output crystals.

Would there be any dangers associated with this? (Aside, obviously, from the standard risks of frostbite associated with working with dry ice.) How long do you think it should be left in the dry ice, if so?
 
Wow, that is an interesting idea. My primary concern would be that at -110°F+ (-79°C+ for you metric types), the contaminants would also precipitate out. And naptha's melting point is -99°F (-73°C), so if you leave it in too long, the whole thing could solidify. Which wouldn't be good considering your precipitation vessel would likely become significantly brittle at that temperature.
 
Trogdor, do you have a data sheet that lists these various properties of naptha (MP, BP, etc) that I could see? (Since naptha is really a family of chemicals, is this actually possible? What about VM&P naptha?)
 
Hey wait a second, that was the only msds on vm&p naptha I could find that had a melting point listed.... but all the other msds's I've looked at list the boiling point as being around 250°F... which is way higher than the one I linked... so who knows.
 
now, how about going in the dry ice for a few seconds, then dumping the naptha with some dmt in a nother vessel puting that one in for a few, doing again and again until nothing falls out of the solution.
 
elfdancer said:
Someone I spoke with theorized that it would cause the DMT to crystalize considerably faster than in a regular freezer, which should lead to better purity of output crystals.
Click to expand...
I'm fairly sure that a slower growth of crystals will yield cleaner crystals. That's the reason larger crystals are desirable, they are large since they've grown slowly and as such are cleaner than smaller crystals.
 
That sounds like a lot of unnecessary work IGNVS. What would happen if you eliminated the freeze precipitation stage by pouring the naptha straight into your recrystalization vessel, evaporating all the naptha, and going straight into recrystalization with the dirty crystal? Would there be too many contaminants to do this efficiently?
 
The colder heptane gets the less soluable dmt becomes. This might help those who have trouble evaping the heptane enough to get all the dmt out with normal freezer tempts.
 
Dry Ice

I purchased some dry ice yesterday. I placed Naptha in it for about 10 min. Froze it solid. Then while it melted quickly I noticed a large about of white goopy stuff floating in it rather than crystals, i let it warm little further to find it to stick to the bottom and look like a very strange goop. I then decided to recrystallize in a warm bath and start over, dry ice pulling it out every 2 mins to swish around. same thing happened with goop accept did not stick to bottom. I noticed it getting close to freezing so I put in the freezer in the other room and left over night. All goop became little crystals over night and was more snow globe like rather than stuck to the bottom. Coffee filter worked wonders and had a much bigger yield than expected.
 
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