SWIM feels very bad about the amount of solvent he is introducing into his environment. He's also a frugal guy and hates wasting something that should be in a reuse loop. As SWIM described his concerns to me I will relate them to you.

SWIM does not like having to crash presip a salt out of solution just to have to rebase again, he also is put off on freeze presip because of the fact that it is highly suggested to reduce the solvent down to 10% original volume via evap, this is unacceptable and kind of makes the whole thing pointless in SWIMS eyes.

What SWIM wants very badly is a contraption of some kind; perhaps it is a vacuum evap system, perhaps not, that could collect the solvent while still allowing separation of the freebase spice within. SWIM is really not familiar enough with true to life tools like this to know if such a thing exists or is actually possible.

SWIM also apologizes in advance for its formal lack of knowledge on this matter as he is sure its an easy Q for big dreamers and organic rearrangers.

Evaporating it down is an option, it will still work if you do otherwise but your yields won't be as high. In which case when your left over semi-saturated Solvent is used for another extraction it will become super saturated and your yields will be even better. I don't know of an alternative..

SWIM says that the idea of freeze precip and only getting most of the agent into solid, then reuse throughout the entire batch as such with a final full evap at the end is acceptable for now at least.

SWIM does wonder about how that would affect things like the pickup ability of the reused solvent in subsequent pulls. SWIM worries it will just add another pull into his system to pickup anything that may have been neglected because the solvent bus was out of seats.

Does one know if this would have a noticeable effect, a low if I was a lab I may care effect, or no real change in the amount of spice comming through on each pull?

I guess a secondary to that is.... is the volume of solvent being used in most teks in relation to the amount of spice we hope to dissolve into it (its carrying capacity) or is it a function of the volume of water that we are extracting from?

distill your solvents

DMT will distill over with your naphtha unless you use a vacuum setup.

hmmm...

Couldn't you use FASA?? as there is no evap or freeze precip of extraction solvent which can then be cleared of acetone and used again. Although I've read that naptha wouldn't be the best choice for extraction solvent.

Their does seem to be some interesting potential to the fumarate form, it seems like it could be more workable then the straight HCL crashed version. Will be looking into this sometime.

Would it be possible to distill volatile solvents cold, even if it's slower? Cooling down the receiving end instead of heating the naphtha?

What SWIM wants very badly is a contraption of some kind; perhaps it is a vacuum evap system, perhaps not, that could collect the solvent while still allowing separation of the freebase spice within.

You mean something like this?:

http://en.wikipedia.org/wiki/Rotary_evaporator

They've got them on ebay, but not too cheap (depending on what you call cheap, of course)

That’s why you use DCM instead of naphtha at that point. DMT will NOT distill with DCM. Then when it’s distilled down to almost nothing, you add acetone and distill off the rest of the DCM until there’s just acetone left. That way you recycle 99% of the DCM. You let the acetone evaporate away. Acetone is found in fruit and in the human body so it’s not so bad for the environment to let it evaporate away.

You use heptane to freeze precipitate the DMT and you never let it evaporate.

Or, use a d-limonene tech. That’s as green as you can get.