1. Acetone for general industrial use often contains impurities such as methanol, aldehydes and organic acids. Potassium permanganate powder is added to reflux during refining. The amount added should keep the acetone purple. If it is not heated, it can be left for 3-4 days. After cooling, filter off the precipitate, add anhydrous potassium carbonate or calcium chloride to dehydrate and dry, and collect by distillation.
2. If acetone is mixed with a small amount of ethanol, ether, chloroform and other solvents, add twice the amount of saturated sodium bisulfite solution and shake during refining to form sodium bisulfite acetone adduct, and then add the same amount of alcohol to it to precipitate crystals , Collect by filtration, wash with alcohol and ether in turn, and dry. Mix this crystal with a small amount of water, add 10% sodium carbonate or 10% hydrochloric acid to decompose the adduct, fractionally distill the filtrate, take the fraction of acetone, add anhydrous calcium chloride or potassium carbonate to dehydration, and re-evaporate it.
