Entropymancer wrote:jbark wrote:A quick note: there is an error in the DMT EXTRACTION overview thread - it is missing the decanting step before freeze precipping, which renders the tek pointless. Mixing your dirty spice in an NPS without separating the undesirables from the product clearly leaves them in with the DMT!
I've edited the text to clarify this point.
I thought "put the nonpolar solvent in the freezer..." was clear enough. It doesn't say to throw the whole shebang in there. And the previous step said to extract with "several volumes of naphtha" and optionally "pool the extracts", both of which indicate that the nonpolar solvent is to be removed from the aqueous phase. But I can see where it would be useful to be explicit in saying that we want to separate the nonpolar solvent from the aqueous phase.
Hey Entropymancer - i hadn't noticed the write up was yours.
I had remarked this quite some time ago and had forgotten about it, but i re-read it when I linked Biskotso, and realized it was missing a step (or was, perhaps, unclear). The text below was cut and pasted just now, and I see no changes and cannot locate the phrases you quoted above:
Quote:Optional) Recrystallize from Hot Solvent
This will help to reduce impurities and give the product a more sharply defined melting point, but it wonβt do much to reduce discoloration unless combined with activated charcoal (see below). To recrystallize, dissolve your product in a minimal volume of hot solvent (e.g. roughly 20 mL naphtha per gram of DMT) and allow the solution to cool slowly with minimal agitation. Once it has reached room temperature, transfer it to the fridge for a couple hours, then to the freezer. Though itβs not necessary, if you have a small DMT crystal on hand, you can add it to the solution to help seed the recrystallization. Regardless, a nice crop of crystals should precipitate out of solution, and can now be collected by filtration. If unsatisfied with the results of a recrystallization, you can always reheat the solvent to redissolve the DMT and reduce the solution volume, then repeat the cooling process. Naphtha is the most commonly used recrystallization solvent, but success has also been reported with hexane.
I am quoting it in its entirety just to assure that we are refering to the same passage. The rest of the writeup is of excellent quality (of course!), but i find this entry to be confusing for lack of the decanting step (the section in question is, of course, in red) . I brought it up in chat and several people concurred, so I thought I would post a caveat here. Sometimes what is clear for those to whom it is second nature can leave others questioning and confused.
I have learned pretty much everything I know about chemistry here at the nexus (still embarrassingly little, I am afraid), so I am rather an expert at being confused in these matters, and hence quite a pro at spotting those passages which may be confusing for others with even less chem or tek knowledge than myself. I hope pointing this out only serves to strengthen your posts in the wiki.
Cheers,
JBArk
JBArk is a Mandelthought; a non-fiction character in a drama of his own design he calls "LIFE" who partakes in consciousness expanding activities and substances; he should in no way be confused with SWIM, who is an eminently data-mineable and prolific character who has somehow convinced himself the target he wears on his forehead is actually a shield.