Preparation of caprolactam

C - Chemistry – Metallurgy – 07 – D

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260/241.7

C07D 223/10 (2006.01) C07D 201/08 (2006.01)

Patent

CA 2003352

Abstract of the Disclosure: Caprolactam is prepared in a process comprising the following steps: a) reacting the 5-formylvaleric ester with liquid ammonia as reaction medium and hydrogen in the presence of a ruthenium catalyst in liquid phase at from 80 to 140°C under a hydrogen partial pressure of from 40 to 100 bar, b) replacing the reaction medium ammonia by an aromatic hydrocarbon having a boiling point of from 80 to 240°C which is liquid under the reaction conditions, c) heating the resulting mixture in liquid phase under superatmospheric pressure at 230 350°C to form caprolactam, and d) isolating caprolactam from the resulting reaction mixture.

Le caprolactame est préparé par un procédé comprenant les étapes suivantes : a) faire réagir l'ester d'acide 5-formylvalérique avec un milieu de réaction ammoniacal liquide et de l'hydrogène, en présence d'un catalyseur au ruthénium, en phase liquide, dans une plage de 80 à 140 degrés C, sous une pression partielle d'hydrogène de 40 à 100 bars; b) remplacer le milieu de réaction ammoniacal par un hydrocarbure aromatique avec un point d'ébullition de 80 à 240 degrés C, qui est liquide dans les conditions de la réaction; c) chauffer le mélange résultant en phase liquide, sous la pression atmosphérique et à 230-350 degrés C, de façon à former le caprolactame; d) isoler le caprolactame du mélange réactionnel résultant.

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