METHOD OF PRODUCING COMMERCIAL ACETONE WITH HIGH RESISTANCE TO OXIDATION Russian patent published in 2001 - IPC

FIELD: production of commercial acetone with high resistance to oxidation. SUBSTANCE: commercial acetone is produced by its separation from products of decomposition of cumene hydroperoxide by multistep rectification. Separated as overhead product in the first column is acetone flow and obtained in still is phenol flow. Acetone flow is directed to partial condenser in which weight ratio of vapor and condensed flows ranges from 1:0.02 to 1: 0.1. Condensed phase is directed to fraction distillation reflux of the first column. Noncondensed products are directed to the second column of separation by rectification to which supplied simultaneously above feed tray is aqueous solution of sodium hydroxide in terms of 100% NaOH from 0.0036 to 0.006 t per one ton of acetone depending on required value of permanganate test from 10 to 70 h. Drawn as everhead product in the second column is aldehyde fraction directed to neutralization stage and flow containing acetone and water is withdrawn as side-cut distilled in vapor phase and directed to partial condenser to separate into liquid and vapor phase with weight ratio of phases from 1:10 to 1:100, respectively. Vapor phase of partial condenser is directed to the third column where commercial acetone is drawn off as overhead product. Still product of the third column presenting acetone aqueous solution is returned to the second column. Liquid phase of partial condenser is treated with solution of alkali and returned, either, to the second, or to stage of neutralization of products of decomposition of cumene hydroperoxide. The second version of method embodiment provides for one column for separation of commercial acetone from vapor phase of partial condenser after the first rectification column. In this case, acetone is drawn off as column overhead product and directed to partial condenser for production in it of liquid and vapor phases in ratio from 1:50 to 1:150, respectively. Vapor phase is condensed in cooler with obtaining of commercial acetone, and liquid phase is treated with aqueous alkali solution and subsequent return of produced raw acetone to the second column, or to point of feed or reflux. EFFECT: production of commercial acetone with high resistance to oxidation. 2 cl, 2 dwg, 1 tbl, 5 ex