Do not put Sassafras Oil in the freezer!
If you read the information provided by LT
Post 294426
(LaBTop: "Sassafras components data", Methods Discourse) it tells you that Eugenol has a MP of -7.4 . Celcius.
So, if you place your Sassafras oil in the freezer then you may freeze Eugenol along with it.
Here is what has worked well
You will need:
Container of Sassafras oil
Dry Ice (frozen CO
2)
Solid safety gloves
Solid plastic Ice cube tray
Solid Glass Bottle with cap
Refridgerator/Freezer
Now:
1. Get some dry ice
2. place some sassafras oil in 2 of the cube spaces in an ice cube tray (2-3 mls in each space)
3. Sit ice cube tray on dry ice for 15 minutes (wear gloves)
4. After 15 minutes place (now) frozen Sassafras oil in ice cube tray into freezer.
5. Chill empty glass bottle and container of Sassafras oil in
refridgerator for 6 or more hours.
6. Pour chilled Sassafras Oil into chilled glass bottle.
7. Drop in one of the frozen crystals of Sassafras oil, from ice cube rack in the freezer, into the chilled bottle containing chilled Sassafras oil, then return remaining crystal to the freezer.
8. Place bottle back into the
refridgerator and leave for a couple of days to slowly crystallise your Safrole.
9. After 2 days, pour off remaining solution and store (it contains small amounts of Safrole)
10.Place bottle with crystallised Sassafras oil into a cold water bath, then warm water, them hot water, in order to melt crystals. (Don't heat up the cold bottle too quickly and crack your bottle because of thermal shock, or you will be a very sad bee.
)
11.Place Safrole laden Sassafras oil back into the
refridgerator and chill for 6 or so hours and repeat steps 7-10.
12. You now have a suitably pure batch of Safrole.
P.S. You would then keep some of the double frozen safrole crystals, and place them in the freezer to use as future "seed crystals"