| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing cyclohexanone oxime in high productivity over a long period by the ammoximation reaction of cyclohexanone through maximally suppressing catalyst cost and maintaining the conversion of the cyclohexanone and the selectivity of the cyclohexanone oxime. SOLUTION: The method for producing cyclohexanone oxime comprises carrying out a continuous reaction between cyclohexanone, hydrogen peroxide and ammonia in the presence of a titanosilicate catalyst. In this method, a multistep operating condition is used, comprising the 1st step of raising the titanosilicate catalyst concentration of a reaction mixture by additional titanosilicate catalyst and the 2nd step of keeping the the titanosilicate catalyst concentration of the reaction mixture within a predetermined range by the extraction and addition of another batch of the titanosilicate catalyst. COPYRIGHT: (C)2006,JPO&NCIPI
|
