Patent ID: 6331654
Filing Date: 2001-12-18
Classification: C07C

Abstract:
A rectification method, for producing high purity acetone from CHP cleavage products, implemented in a multi-stage process system, the system comprising a first, a second, and a third column, the method comprising the steps of;(a) producing an acetone fraction from a first column overhead, the first column functioning without reflux;(b) providing a first partial condenser between the first and the second columns and delivering overhead products of the first column to said first partial condenser as a vapor phase, wherein from about 2 to about 10% relative products are condensed in said partial condenser;(c) directing said condensed products to recycle to a feed of the first column and directing a non-condensed phase of said products comprising crude acetone to a feed of the second column;(d) directing a take-off of an aldehyde fraction from the second column overhead and directing of this fraction to a neutralization stage;(e) providing a second partial condenser between the second and the third columns and directing a take-off of the second column vapor phase as a side-draw to said second partial condenser to produce an acetone vapor phase and an acetonic liquid phase;(f) directing said acetone vapor phase from said second partial condenser to a third column feed, treating said acetone liquid phase with an alkali solution and returning said acetone liquid phase to said first second column and to said neutralization stage of cumene hydroperoxide cleavage products; and(g) removing a take-off of product acetone from the third column overhead, said product acetone having a high stability to oxidation, having a value of permanganate time from about 8 to about 70 hours.