METHOD OF CLEANING CRUDE ACETONE Russian patent published in 2010 - IPC C07C49/08 C07C45/82 C07C45/86 

FIELD: chemistry.

SUBSTANCE: crude acetone is successively distilled in two distillation columns, whereby in the first distillation column low-molecular impurities are separated with addition of an alkaline reagent into the column and then extracting the remaining mixture of components in form of a bottom product and feeding it into the second distillation column for separation of high-molecular impurities and extraction of commercial-grade acetone. An alkaline reagent is fed into the second distillation column higher than the feeding point, which enables production of acetone with permanganate oxidation time of not less than 8 hours. The alkaline reagent is fed into the first distillation column in form of 0.1-30 wt % of an aqueous solution in amount of 0.05-0.8 wt % of the substance fed into the column. An oxidative reagent is also fed into the first distillation column in amount of 0.02-0.5 wt % of the substance fed into the column with weight ratio of the alkaline reagent fed into the first column to the oxidative reagent between 1:0.1 and 1:100, preferably between 1:0.5 and 1:10. An alkaline reagent is also fed into the second column higher than the feeding point in amount of 0.03-0.5 wt % of the substance fed. The weight ratio of the alkaline reagent fed into the second column to the alkaline reagent fed into the second column lies between 1:0.1 and 1:0.5. The second distillation column is used at atmospheric pressure.

EFFECT: method enables production high-quality acetone with maximum use of existing equipment and reagents, with minimum capital expenses on modernisation.

7 cl, 2 tbl, 1 dwg, 13 ex