benzaldehyde and polyethylene glycol (d=?) in solutiion
wish to seperate the two and or impurities.
liquid to liquid ?
just wondering what might be an efficient method.
no real app here.Nicodem - 30-10-2008 at 00:21
Distillation with steam.
PS: You could have used our new "short question" thread for this.DNA - 30-10-2008 at 00:29
Column Chromatography would do a great job, although would be quite expensive and time-consuming (steam distilation also takes ages) but they
definately would have quite different Rf's so they are well seperatable.Klute - 30-10-2008 at 08:54
I think PEG is quite soluble in water, you could add waterand extract the aldehyde with toluene or another non poalr solvent (don't use esters etc).
Or you could try a bisulfite extarction. This topic has been discussed endlessly here and elsewhere.mechem - 31-10-2008 at 05:58
Hi kute
Why do you say don't use ethers.Panache - 31-10-2008 at 06:07
Quote:
Originally posted by mechem
Hi kute
Why do you say don't use ethers.
Its Klute and he said don't use 'esters' because they react like esters do at elevated temperatures with aldehydes. Ethers won't react and would be
fine to use as extraction solvents.Klute - 31-10-2008 at 16:45
I was rather thinking of the polarity issu, polar solvent slikes esters might dissolve more PEG. Something like toluene would be perfect for
benzaldehdye, but would hardly reclaim any PEG IMHO.chemrox - 31-10-2008 at 23:02
precipitate the benzaldehyde bisulfite complex as Klute mentioned above
