SEPARATION BY RECTIFICATION OF UNSATURATED CARBOXYLIC ACIDS FROM SOLVENTS

摘要

In a process for the separation by rectification of unsaturated carboxylic acids from solvents in which the acids were absorbed after the synthesis reaction, the rectification is briefly interrupted and the rectification column is flushed with a basic solution. The interruption is carried out at regular time intervals. The basic solution used is an aqueous solution of alkali metal and/or alkaline earth metal hydroxide, preferably NaOH, KOH, Ca(OH)2 or their anhydrous oxides; alkaline polar organic solvents as amines or amides can be used, too.