Method for producing caprolactam from 6-aminocapronitrile

C - Chemistry – Metallurgy – 07 – D

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Details

C07D 201/08 (2006.01) C07D 201/16 (2006.01)

Patent

CA 2407723

The invention relates to a method for producing caprolactam, characterized in that a) a mixture (I) containing 6-aminocapronitrile and water in the liquid phase is converted into a mixture (II) containing caprolactam, ammonia, water, high boilers and low boilers in the presence of a catalyst; b) ammonia is then removed from mixture (II), leaving a mixture (III) containing caprolactam, water, high boilers and low boilers; c) water is then removed from mixture (III) leaving a mixture (IV) containing caprolactam, high boilers and low boilers, and d) a solid (V) containing caprolactam is obtained from mixture (IV) by crystallization, the proportion by weight of caprolactam in the solid (V) being greater than that in the mixture (IV).

L'invention concerne un procédé de préparation de caprolactame, caractérisé en ce que a) un mélange (I) contenant 6-aminocapronitrile et de l'eau en phase liquide est mis à réagir avec un mélange (II) contenant du caprolactame, de l'ammoniac, de l'eau, une substance à point d'ébullition élevé et une substance à point d'ébullition bas, en présence d'un catalyseur, ensuite, b) l'ammoniac est séparé du mélange (II) pour obtenir un mélange (III) contenant du caprolactame, de l'eau, la substance à point d'ébullition élevé et la substance à point d'ébullition bas, puis, c) l'eau est séparée du mélange (III) pour obtenir un mélange (IV) contenant du caprolactame, la substance à point d'ébullition élevé et la substance à point d'ébullition bas, et enfin, d) à partir du mélange (IV), on obtient par cristallisation une matière solide (V) contenant du caprolactame, la part en poids du caprolactame dans la matière solide (V) étant supérieure à celle contenue dans le mélange (IV).

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