feed it water, feed it milk, feed it honey, and their ilk.
spin it round. do the math. ethanol. then short path.
Edit: which I think means build a lookup table. or an equation that fits. then gather your data as you boil off the ethanol (monitoring weight loss!). but I could be misinterpreting.
there is also no mention of vac, which would be required if you wanted to do the evap at room temp.