Dsm IP Assets B.v.

Dsm N.v.

Alex Pit

Henk Oevering

Arno Herald Benneker

Marc Blaauw

Antonius Jacobus Franciscus Simons

Paulus Johannes Jacobus Pieters

Theodorus Friederich Maria Riesthuis

The invention relates to a process for the production of cyclohexanone oxime in which a phosphate-containing aqueous reaction medium is cycled from a hydroxylammonium synthesis zone to a cyclohexanone oxime synthesis zone and back to the hydroxylammonium synthesis zone, in which hydroxylammonium synthesis zone hydroxylammonium is formed by catalytic reduction of nitrate with hydrogen, and in which cyclohexanone oxime synthesis zone hydroxylammonium is reacted with cyclohexanone to form cyclohexanone oxime, where the concentration hydroxylammonium in the aqueous reaction medium entering the cyclohexanone oxime synthesis zone is higher than 1.0 mol/l.

Process for the production of cyclohexanone oxime

Process for the production of cyclohexanone oxime in which a phosphate-containing aqueous reaction medium is cycled from a hydroxylammonium synthesis zone to a cyclohexanone oxime synthesis zone and back to the hydroxylammonium synthesis zone, in which hydroxylammonium synthesis zone hydroxylammonium is formed by catalytic reduction of nitrate with hydrogen, and in which cyclohexanone oxime synthesis zone hydroxylammonium is reacted with cyclohexanone to form cyclohexanone oxime, wherein the phosphate concentration in the acqueous reaction medium entering the cyclohexanone oxime synthesis zone is higher than 3.0 mol/l.

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Evans, GA, United States of America

Alex Pit