extraction method

[akcapr]

Well i found a little extraction method for myself that ive never exactly heard of: lets say you take a solution of something in water, then u add 200 proof EtOH, and some of the stuff that was in the water precipetates out n u can collect. Just thought i would share this, guess its a form of crystallization.

[ecoli]

I've used that technique to precipitate proteins from a solution (for purifing DNA). It does work rather well, especially if you centrifuge the mixture for a couple of minutes.

[xeluc]

You can do this with other solvents too. I remember I once had a clear solution of very acidified CuCl. The Chlorine ligands alowed it to stay relatively stable while under an inert atmosphere, but once excess water was added, the CuCl fell out of solution. So basicly, you can add a liquid that's miscible in your solvent but not soluble to your disolved compound and get very small crystals to precipitate out of solution.

[Tartaglia]

A very common and very useful method. I spent most of my PhD recrystalising compounds this way, but using light petroeum, diethylether, thf, ethanol, methanol, diglyme, acetone, water, chloroform, dichloromethane and just about every combination of these