acetone 10 6 methanol a liquid composition of 80 5 acetone 19 5 methanol which is a relative volatility of 2 08 three grams each of dmfa glycerine and propylene glycol were added and refluxing continued for another twelve hours analysis indicated a vapor composition of 89 2 acetone 10 8 methanol a liquid composition of 80 4 acetone 19 6 methanol which is a relative volatility of 2 02 a glass perforated plate rectification column was calibrated with ethylbenzene and p xylene which possesses a relative volatility of 1 06 and found to have 4 5 theoretical plates a solution of 200 grams of methanol and 200 grams of acetone was placed in the stillpot and heated when refluxing began an extractive agent comprising pure dmfa was pumped into the column at a rate of 22 23 ml min the temperature of the extractive agent as it entered the column was 46 u00b0 c after establishing the feed rate of the extractive agent the heat input to the acetone and methanol in the stillpot was adjusted to give a reflux rate of 10 20 ml min after one hour of operation overhead and bottoms samples of approximately two ml were collected and analysed by gas chromatography the overhead analysis was 81 5 acetone 18 5 methanol the bottoms analysis ananlysis was 50 acetone 50 methanol using these compositions in the fenske equation with the number of theoretical.