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Topic: Crystallization of ethyl acetate  (Read 4730 times)

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Offline Spectrologist

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Crystallization of ethyl acetate
« on: October 22, 2011, 10:08:05 AM »
Does anyone know any method of crystallization ethyl acetate? I'd be very thankful for any advices or sources where that knowledge could by found.

Offline discodermolide

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Re: Crystallization of ethyl acetate
« Reply #1 on: October 22, 2011, 10:11:13 AM »
Does anyone know any method of crystallization ethyl acetate? I'd be very thankful for any advices or sources where that knowledge could by found.

Ethyl acetate is a liquid at room temperature, it has a MPt.  of -84°C.
Purification is carried out by distillation, BPt. 77°C.

So what exactly are you asking?
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Offline Spectrologist

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Re: Crystallization of ethyl acetate
« Reply #2 on: October 23, 2011, 04:42:03 AM »
I'm asking how to obtain single crystal of ethyl acetate.

Offline discodermolide

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Re: Crystallization of ethyl acetate
« Reply #3 on: October 23, 2011, 05:54:08 AM »
I'm asking how to obtain single crystal of ethyl acetate.

Cool it down slowly to the MPt. Let it crystsallise slowly.
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Offline Spectrologist

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Re: Crystallization of ethyl acetate
« Reply #4 on: October 23, 2011, 06:19:54 AM »
Shouldn't I use Czochralski process or something similar? Is it really enough to cool it down? What is best to cool down dry ice? As far as I understand I shoud cool it down in reactor.

Offline discodermolide

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Re: Crystallization of ethyl acetate
« Reply #5 on: October 23, 2011, 07:27:33 AM »
Shouldn't I use Czochralski process or something similar? Is it really enough to cool it down? What is best to cool down dry ice? As far as I understand I shoud cool it down in reactor.


The process requires a seed, as far as I am aware.
Dry ice should be enough, but how are you going to get your crystal out?
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Offline Dan

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Re: Crystallization of ethyl acetate
« Reply #6 on: October 23, 2011, 07:52:56 AM »
CO2 sublimes at -78oC, it won't freeze EtOAc at atmospheric pressure.
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Offline cth

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Re: Crystallization of ethyl acetate
« Reply #7 on: October 23, 2011, 08:19:48 AM »
Cooling down a solution of ethyl acetate will most likely give you a polycrystalline solid. No use if you want a single crystal.

You could obtain single crystals by evaporating ethyl acetate under reduced pressure at room temperature and condensing it on a cold finger (filled with liquid nitrogen, or better liquid helium). This method usually gives nice single crystals. If you find those crystals to be too small, you could use them as seeds in the Czochralski process.

Or else, go to work in Antarctic during a harsh winter storm  ;D

Good luck

Offline Spectrologist

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Re: Crystallization of ethyl acetate
« Reply #8 on: October 23, 2011, 09:03:20 AM »
Thanks cth!
I thought of evaporation, I just couldn't put it all together.
Maybe you know a book or magazine where could I find more about whole process?

One more time big thanks!

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