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DCM = Dichloromethane

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Rising Star
Some art supply stores have it. Some plastics supply companies sell it (it’s used as a welding solvent for acrylic plastic). Lowes, Home Depot, and similar places usually don't have it.

Look for Acrylic Solvent Cement by Craftics. It’s DCM with a small amount of alcohol as a stabilizer. It is extremely clean and can be used as is.
 
what about the methylene chloride with a bit of methane in it as paint stripper, what do you have to do to it to make it useable.

I found some strippers but none of them said what was in it other than a *caution contains methylene chloride*, does that mean thats ALL thats in it?
 
I second Girlshateme's request - would it be OK to use a 90%DCM/10%Methanol mix or would I have to remove the methanol? If so what is the easiest way to remove the Methanol without the aid of distillation device e.g could you add water which would mix with the methanol and not the DCM (or does methanol like dcm better?).

Anyone have a clue?
 
Simply mix it with water. The methanol will go into the water and the DCM will sink to the bottom. Then separate the water/methanol mix. Do this a few times to get all the methanol out.
 
Dammit ron, I wish I had told my friend that before he went and ordered lab grade methylene chloride, no slight I guess, it was just kindof expensive at 25 bucks for 500ml.

Oh well, thats good news for next time

thanks so much as it was very hard to find the methylene chloride
 
Cheers Ron, thought that might be the quick and nasty way to remove the methanol. I can get HPLC grade DCM but it's helluva expensive once you add on VAT and P&P (damn near doubles in price). Mind you its much cheaper than $25 for 500ml.
 
look at the partition coefficient value. (xlogp)
this value is a relative way of figuring out a compound's solubility in a solvent/mixture of solvents

dmt has an xlogp of 2.
dcm is 1.5
chloroform is 1.9

naptha has an xlogp of 4 to 6.

to answer your question, it requires more effort to extract with naptha (i.e. heating the solvent, multiple pulls). also, less dcm is required than naptha, to do extractions. only one good pull is necessary, and it can be done at room temp.
 
If you distill DCM after use (which SWIM does all the time), because of the very low boiling point very few other things will distill along with it.

DCM also distills VERY FAST. You can actually distill your used solvent during a an A/B extraction, and newly distilled DCM will be ready for your next pull in about 15 minutes or so. So you can do several pulls with the same solvent. It’s ideal for extraction.

Also because it sinks below water rather than rises, it’s perfect for use in a separatory funnel. When you defat in a separatory funnel, you just drain off the DCM, then redistill it and reuse it to defat again. When you freebase extract with DCM, again you just drain off the DCM, and distill it down to about 50 ml, and reuse the distilled solvent for another extraction. That means you never need to take the water layer out of the separatory funnel during the entire A/B extraction process and you can re-use 300 ml of DCM over and over to defat and then to extract. It’s very convenient.
 
Alright, so ponder & enlighten me, if you don't mind, my chemical-molecularly gifted friends:

In an instance where one might find oneself using, say, a solvent that consists of (approximately) 35% diethyl ether, 65% heptane, and trace amounts of lubricants, how might (if possible) one go about distilling/removing the lubricants from this composition?

I swear by heptane (especially in situations involving recrystallization), but have found that, aside from the trace amounts of residues left behind by the lubricants in this mixture, much larger and prettier crystals have had a tendency of forming in less amounts of time through freeze precip.


Tips? Comments? Advice?
 
benzyme said:
btw, 35 + 65 = 100%..no room for trace
Click to expand...

Right, hence the "(approximately)" part. Trust me, there are trace amounts of lubricants in this mixture. Works wonderfully for extractions, but I've been having to recrystallize w/ heptane afterwards to remove these trace lubricants, turning my beautiful, super-clear, gigantic crystals into standard crystals. . .
 
Yes, yes, hmmm. . . which would defeat the purpose all together. Oh well, I suppose that I can simply grow crystals with heptane in a manner similar to that demonstrated by the cat who wrote the dmt handbook.
 
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