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Topic: Emulsion problems: Et2O and water  (Read 6504 times)

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Offline mir

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Emulsion problems: Et2O and water
« on: October 20, 2006, 05:50:28 AM »
How can I seperate an emulsion between diethylether and a strong alkalic water solution effieciently and without waiting especially long?

My wild guesses:
Use ultrasound?
Use a centrifuge?
Heat the emulsion sligthly so the densitydifferences is changed?

Surprisingly, I have done this workup plenty of times now, but suddenly now I get an emulsion. How can that be possible?

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Offline Mitch

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Re: Emulsion problems: Et2O and water
« Reply #1 on: October 20, 2006, 07:27:25 AM »
Maybe adding NaCl?
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Offline russellm72

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Re: Emulsion problems: Et2O and water
« Reply #2 on: October 20, 2006, 10:06:17 AM »
Also sometimes adding a touch of EtOH can help break up an emulsion.

R.
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Offline mir

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Re: Emulsion problems: Et2O and water
« Reply #3 on: October 20, 2006, 12:30:21 PM »
Thanx :-)

I saturated the watersolution with NaCl. It worked perfectly well. And later on (helped by another tip I got from this forum, adding Toluene to remove Acetic Acid as an azeotrope), I got 50% crude yield, and that is really great. GC is showing my phenol in satisfactory purity :-)
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Offline Borek

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Re: Emulsion problems: Et2O and water
« Reply #4 on: October 20, 2006, 03:41:07 PM »
Quote from: mir on October 20, 2006, 12:30:21 PM
I saturated the watersolution with NaCl. It worked perfectly well. And later on (helped by another tip I got from this forum, adding Toluene to remove Acetic Acid as an azeotrope), I got 50% crude yield, and that is really great.

Collective wisdom of ChemicalForums :)
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