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Topic: DRYING THF  (Read 13908 times)

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Offline ivanakaj

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DRYING THF
« on: March 31, 2009, 08:24:40 AM »
Have you ever dryed THf yourselves?
What did you use?

thnx  :)

Offline P

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Re: DRYING THF
« Reply #1 on: March 31, 2009, 09:11:19 AM »
The lab I used to work in had a THF still. They distilled it after drying with Sodium wire for a few days first. 
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Offline cundi

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Re: DRYING THF
« Reply #2 on: March 31, 2009, 10:02:49 AM »
THF + sodium (wires) + small quantity of benzophenone
Heat the mixture at refluxing temperature. When it becames blue you can destilled it.
Benzophenone is used as indicator. It is a radical aceptor.
When it is blue means that no water is present in the media.

I recommend you to use inert atmosphere

Offline azmanam

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Re: DRYING THF
« Reply #3 on: March 31, 2009, 10:23:40 AM »
please be careful if you set up a THF still.  They are major explosion hazards in the lab

start here:
http://www2.chemistry.msu.edu/Safety/safety_sop_01.asp
http://curlyarrow.blogspot.com/2008/09/anhydrous-solvents-part-2-thf-still-dos.html
Knowing why you got a question wrong is better than knowing that you got a question right.

Offline Squirmy

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Re: DRYING THF
« Reply #4 on: March 31, 2009, 12:48:58 PM »
What kind of reaction do you need it for? You may be able to get by with a septum-capped bottle of anhydrous THF. If you can go that route, it's worth it in terms of safety.

Offline ivanakaj

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Re: DRYING THF
« Reply #5 on: April 01, 2009, 02:43:20 AM »
I need it for grinard..

Offline Squirmy

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Re: DRYING THF
« Reply #6 on: April 01, 2009, 11:03:41 AM »
Yeah, I'd just buy a bottle of anhydrous THF. Fisher sells them with an Acroseal.

Offline ivanakaj

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Re: DRYING THF
« Reply #7 on: April 03, 2009, 03:08:58 AM »
THNX!

I had some old THF, so I had no other choice then to dry it. So I did set up a still, and it all went ok.

Your advices were great, thank you all for taking the time!

Wish me luck. :)

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