To quote one very busy bee: Lets emphasize two things here.... Acetone is FLAMMABLE. Make sure the damn thing is totally gas tight before you light a propane burner. Ketene is POISON. And you don't need much of it to completely mess you up. So have good ventilation. I wold also recommend having a small SCUBA "pony" tank with a regulator so if things get out of hand you can use it to be able to breathe while you prevent the whole thing from boiling over or going out of control. Please plan out this thing very very carefully, and understand everything involved before you light that burner. If you do it right, it will be perfectly safe.
wouldnt it be much safer just to buy it? http://www.pictureline.com/products/1899/Kodak_Glacial_Acetic_Acid_1_gal./
buy it cheap and unwatched--far as I know or evap vinegar as it is nothing but diluted acetic acid I was cleaning out a warehouse some time ago and threw out gallons of it reagent grade its no big deal I dont even know why you would want it? h prod under vacuum perhaps but that is not very productive as it is usually made with AA as acetic alone just isnt potent enough