Patent ID: 7423178
Filing Date: 2008-09-09
Classification: C07C

Abstract:
1. Process for preparing cyclohexanone oxime which comprises: (a) feeding organic solvent into a cyclohexanone oxime synthesis zone at a feeding level for organic solvent, and countercurrently contacting an aqueous medium which comprises hydroxylammonium with an organic medium which comprises cyclohexanone; (b) reacting said hydroxylammonium with said cyclohexanone to form cyclohexanone oxime; (c) distilling an organic solution comprising cyclohexanone oxime, cyclohexanone and the organic solvent to obtain (i) a first product comprising organic solvent, (ii) a second product comprising cyclohexanone oxime and cyclohexanone at a weight ratio of cyclohexanone oxime/cyclohexanone of greater than 0.5, and (iii) a third product comprising cyclohexanone oxime; and (d) feeding the second product into said cyclohexanone oxime synthesis zone at a level downstream of the feeding level for organic solvent in relation to a flow direction the organic medium.