| 摘要 |
A method for purifying a crude acetone raw material containing low molecular weight impurities using three columns in sequence is disclosed. The method comprises the steps of feeding the crude acetone raw material into a first column; adding an alkaline reagent and an oxidative reagent into the first column; feeding the first bottom fraction to a second rectification column; optionally adding an alkaline reagent to the second column above the charge point of the bottom fraction; separating a purified acetone from the high molecular weight impurities and removing the purified acetone as a top fraction by distillation in the second column, thereby forming a second bottom fraction comprising an acetone mixture comprising high molecular weight impurities; feeding the second bottom fraction comprising the acetone mixture to a third rectification column; removing a top fraction from the third column; and returning the top fraction removed from the third column to the first column, wherein the second rectification column is operated at atmospheric pressure, and wherein the purified acetone has an acetaldehyde level of less than 5 ppm and a KT-Test time of greater than 11 hours, as measured by the SABIC KT-Test method. |
