ACETONE PURIFICATION METHOD Russian patent published in 2010 - IPC C07C49/08 C07C45/82 C07C45/86 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of purifying acetone obtained together with phenol during decomposition of cumene hydroperoxide. The method involves distillation of crude acetone successively in three distillation columns. Low-boiling impurities are separated in the first distillation column 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-boiling impurities and extraction of the larger portion of acetone in form of commercial-grade acetone. Content of acetone in the still of the second distillation column is kept at a level not lower than 0.5 wt % of the supply by extracting the remaining components of the mixture in form of a bottom product of the second distillation column and then feeding into the third distillation column in order to separate the remaining acetone together with the remaining low-boiling impurities, including the remaining aldehydes and feeding this mixture into the first distillation column. An additional alkaline reagent is fed into the second distillation column which enables production of acetone having permanganate oxidation time of not less than nine hours. The alkaline reagent is fed into the first distillation column in form of a 0.1-30 % aqueous solution in amount of 0.05-0.8 wt % of the supply, and an oxidative reagent is also added in form of a 0.1-30% aqueous solution in amount of 0.02-0.5 wt % of the supply in weight ratio of the alkaline reagent to the oxidative reagent between 1:0.1 and 1:100, preferably between 1:0.5 and 1:10; the alkaline reagent is also fed into the second distillation column in amount of 0.03-0.5 wt % of the supply and the ratio of the alkaline reagent fed into the first column to the alkaline reagent fed into the second column is 1:0.2, wherein the second and third columns are used at atmospheric pressure.

EFFECT: disclosed method enables production of high-quality acetone with minimal operational costs and achieving maximum possible output.

9 cl, 2 tbl, 1 dwg, 13 ex