Process for treating an aqueous medium containing cyclohexanone oxime and cyclohexanone

A process for preparing cyclohexanone oxime comprising:

• passing an aqueous medium containing phosphate from a hydroxylammonium synthesis zone to a cyclohexanone oxime synthesis zone, from the cyclohexanone oxime synthesis zone to a stripping zone and from the stripping zone back to the hydroxylammonium synthesis zone,
• in said hydroxylammonium synthesis zone, preparing hydroxylammonium by catalytically reducing nitrate or nitrogen oxide with hydrogen;
• in said cyclohexanone oxime synthesis zone, preparing cyclohexanone oxime by reacting hydroxylammonium with cyclohexanone;
• in said stripping zone, stripping the aqueous medium with steam;
• wherein said stripping is carried out at a pressure higher than 0.11 MPa.