Dry Ice for evap?

[WaffleStompN214]

My buddy told me that one can use dry ice for evaporation if they don’t want to wait all night with it in freezer. I tried it once (pouring pippettes of loaded naphtha over the chunk of dry ice in a casserole dish) and it seemed to work ok but I was an absolute newbie then so idk if it was partly a placebo effect or if dry ice is a legit method for evaporation. My buddy said that crystals of deem would just bounce off the dry ice instantly but that’s not even close to what happened when i tried it. I have a video of it, I’ll post it if i can find it. Has anyone else tried this? Can someone tell me if the science legitimizes the claim?

 

[fractals4life]

Well ... Evaporation is speeded up by heat and slowed by cold, so from the outset this sounds bogus, unless your solvent is supercritical CO2 or something (it clearly isn't, though).

The freezer isn't used for evaporation either, it's used for freeze precipitation, the solvent remains a liquid and the DMT drops out because the solvent is too cold to dissolve it any more. Evaporation is where the solvent all turns to vapour leaving DMT (and everything else that might have dissolved in the solvent ) behind.

Dry ice is certainly cold enough to cause freeze precipitation, if I were to give it a go I'd break up the dry ice more, put it in an insulating tray and then rest my precipitation dish in that. Then once it had chilled down nicely I'd add my solvent and wait a few tens of minutes with the dish covered.

Generally though, chilling really fast is a recipe for very small crystals that will get suspended in the solvent and need filtering out, rather than clusters of larger crystals clinging to the bottom of the dish where they can easily be collected after pouring off the solvent. I find a short time in the fridge followed by overnight in the freezer works well.

Good things come to those who wait, as they say

 

[McCoffeeSpot]

Well ... Evaporation is speeded up by heat and slowed by cold, so from the outset this sounds bogus, unless your solvent is supercritical CO2 or something (it clearly isn't, though).

The freezer isn't used for evaporation either, it's used for freeze precipitation, the solvent remains a liquid and the DMT drops out because the solvent is too cold to dissolve it any more. Evaporation is where the solvent all turns to vapour leaving DMT (and everything else that might have dissolved in the solvent ) behind.

Dry ice is certainly cold enough to cause freeze precipitation, if I were to give it a go I'd break up the dry ice more, put it in an insulating tray and then rest my precipitation dish in that. Then once it had chilled down nicely I'd add my solvent and wait a few tens of minutes with the dish covered.

Generally though, chilling really fast is a recipe for very small crystals that will get suspended in the solvent and need filtering out, rather than clusters of larger crystals clinging to the bottom of the dish where they can easily be collected after pouring off the solvent. I find a short time in the fridge followed by overnight in the freezer works well.

Good things come to those who wait, as they say

Just as you said the dry ice works when placed in an insulated dish with dish containing solvent rested on top to speed up the process at the cost of having small crystals. Using a fridge and freezer over a 24h or longer period of time will definitely give you the larger crystals but comparatively I haven’t seen much any difference in yield using either method just the size of the crystals. When doing a re-x you are using much less solvent- the dry ice method works amazing, and deems crash out instantly.

 

[WaffleStompN214]

Well ... Evaporation is speeded up by heat and slowed by cold, so from the outset this sounds bogus, unless your solvent is supercritical CO2 or something (it clearly isn't, though).

The freezer isn't used for evaporation either, it's used for freeze precipitation, the solvent remains a liquid and the DMT drops out because the solvent is too cold to dissolve it any more. Evaporation is where the solvent all turns to vapour leaving DMT (and everything else that might have dissolved in the solvent ) behind.

Dry ice is certainly cold enough to cause freeze precipitation, if I were to give it a go I'd break up the dry ice more, put it in an insulating tray and then rest my precipitation dish in that. Then once it had chilled down nicely I'd add my solvent and wait a few tens of minutes with the dish covered.

Generally though, chilling really fast is a recipe for very small crystals that will get suspended in the solvent and need filtering out, rather than clusters of larger crystals clinging to the bottom of the dish where they can easily be collected after pouring off the solvent. I find a short time in the fridge followed by overnight in the freezer works well.

Good things come to those who wait, as they say

Thanks, that was a brain fart, I meant to say precipitation.

 

[WaffleStompN214]

Well ... Evaporation is speeded up by heat and slowed by cold, so from the outset this sounds bogus, unless your solvent is supercritical CO2 or something (it clearly isn't, though).

The freezer isn't used for evaporation either, it's used for freeze precipitation, the solvent remains a liquid and the DMT drops out because the solvent is too cold to dissolve it any more. Evaporation is where the solvent all turns to vapour leaving DMT (and everything else that might have dissolved in the solvent ) behind.

Dry ice is certainly cold enough to cause freeze precipitation, if I were to give it a go I'd break up the dry ice more, put it in an insulating tray and then rest my precipitation dish in that. Then once it had chilled down nicely I'd add my solvent and wait a few tens of minutes with the dish covered.

Generally though, chilling really fast is a recipe for very small crystals that will get suspended in the solvent and need filtering out, rather than clusters of larger crystals clinging to the bottom of the dish where they can easily be collected after pouring off the solvent. I find a short time in the fridge followed by overnight in the freezer works well.

Good things come to those who wait, as they say

Just as you said the dry ice works when placed in an insulated dish with dish containing solvent rested on top to speed up the process at the cost of having small crystals. Using a fridge and freezer over a 24h or longer period of time will definitely give you the larger crystals but comparatively I haven’t seen much any difference in yield using either method just the size of the crystals. When doing a re-x you are using much less solvent- the dry ice method works amazing, and deems crash out instantly.

Thanks. When you say large crystals, how large are you talking? Because I typically use the freezer method and I defat and do the carbonate wash but I’ve never produced anything that I’d call large crystals.