"  Your best bet is probably just to let the mix of oil and water sit for a while, at least an hour or two, until it separates out, then skim the oil off the top.

Regarding your specific questions:

1) That depends on the oil. Plant "essential oils" are usually a mixture of many different compounds, some of which will evaporate at lower temperatures than water does, some of which won't. Evaporation is probably not the way to go.

2) If you freeze your liquids, the ice will be almost pure water. This will indeed let you skim off the water pretty easily. Watch out, though -- that will leave anything that was dissolved in the water behind.

3) It's more likely to destroy them, I'm afraid. The aromatic compounds valued in essential oils tend to decompose when heated that much.

From: Yahoo Answers

Could I ask what the whole charade was for?

Try this;

Centrifuge the sample mixer first.  You should have two layers, upper layer is oil and low layer is water. 

Freeze the sample, then the water layer will be frozen but not the plant oil layer.  Using the pippet to take out the liquid plant oil. 

let the water to be defrozen. 

*Wonders wtf is going on*

  but the exposed surface of the oil is nonpolar, and the structure of the polar water molecules interacting with the nonpolar oil creates an easy boundary without complicated methods.  :/ 

    hooray for integrated physics and chemistry class  -_-

try this website

http://en.wikipedia.org/wiki/Lipid_bilayer

ya why??

Lmao....zeta's got the best answer! xD

    I'll bet you seriously undervalue the intelligence of this community.... or seriously overestimate your own.

Thank you for explaining Wraith.

P.S - You think we are that stupid? ='(

Zeta controls all of us! :O

why not "soap" it out of the water aka shake it violently? if the oils have a polar and non-polar part, it should build enough bridges and create enough bubbles, then scoop off the bubbly part...or just wait a looong time until it all layers out by itself and scoop off each of the formed oil-layers...or just slow-centrifuge it so it'll speed that process up a bit...or perhaps electrophoresis?

question is...are we creating a new kind of drug by extracting plant-oils?!

       You know what's awesome?   weed pizza.   You just get take and bake pizza, then you put some pot on it and bake it.   (make sure to break up and de-seed your pot first :O )