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Author: Subject: How do you wash propenylbenzene?
FriendlyFinger
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[*] posted on 18-1-2006 at 19:40
How do you wash propenylbenzene?

How the hell do you wash propenylbenzene without massive emulsion problems? The benzene with 4X volume of DCM was washed with 10% NaHCO3, brine, dH2O. All results in bad emulsion.

Do you have to change solvent?

[Edited on 19-1-2006 by FriendlyFinger]
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chochu3
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[*] posted on 18-1-2006 at 20:24


DCM and water if shaken real hard will always form an emulsion. One could let it sit and allow the emulsion to seperate.



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[*] posted on 18-1-2006 at 20:52


Well that's right, but it takes a very, very,very long time.
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[*] posted on 31-1-2006 at 01:04


That is, I mean, waiting for the emulsion from washing propenylbenzene takes a very long time. Clean DCM and H2O separates very quickly.
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chochu3
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[*] posted on 31-1-2006 at 01:26


I'm not sure (do not remember) but I think one could add salt (NaCl) to help seperate the DCM from water instead of waiting.



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[*] posted on 31-1-2006 at 07:53


Quote:
Originally posted by chochu3
I'm not sure (do not remember) but I think one could add salt (NaCl) to help seperate the DCM from water instead of waiting.


He mentioned the use of brine in his first post which is basically a concentrated salt solution. The only way it seems like this specific emulsion will go away is by waiting.



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