[ivanakaj]

Have you ever dryed THf yourselves?
What did you use?

thnx 

[P]

The lab I used to work in had a THF still. They distilled it after drying with Sodium wire for a few days first. 

[cundi]

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

[azmanam]

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

[Squirmy]

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.

[ivanakaj]

I need it for grinard..

[Squirmy]

Yeah, I'd just buy a bottle of anhydrous THF. Fisher sells them with an Acroseal.

[ivanakaj]

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.