Method for removing 6-aminocapronitrile from mixtures that...

C - Chemistry – Metallurgy – 07 – C

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C07C 253/34 (2006.01) C07C 209/48 (2006.01) C07C 255/24 (2006.01)

Patent

CA 2412928

The invention relates to a method for removing, by distillation, 6- aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that has a hexamethylenediamine content of less than 1 wt.- %, b) removing completely or partially the 6-aminocapronitrile from mixture (I) while obtaining a mixture (II) whose content in substances that have a higher boiling point as 6- aminocapronitrile under distillation conditions and that cannot be formed by dimerization reactions when 6-aminocapronitrile is thermally treated is less than 1 wt.- %, and c) completely or partially removing from mixture (II) the hexamethylenediamine that might be present while obtaining a mixture (IV) whose hexamethylenediamine content is higher than that of mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of mixture (II).

L'invention concerne un procédé de séparation par distillation de 6-aminocapronitrile à partir de mélanges de 6-aminocapronitrile, d'adipodinitrile et d'hexaméthylène diamine, caractérisé a) en ce qu'on sépare l'hexaméthylènediamine du mélange, tout en maintenant un mélange (I) ayant une teneur en hexaméthylènediamine inférieure à 1 % en poids, b) on sépare le 6-aminocapronitrile, totalement ou partiellement, à partir du mélange (I), tout en maintenant un mélange (II) dont la teneur en produits bouillant, dans les conditions de distillation, à une température plus élevée que le 6-aminocapronitrile, et qui ne peuvent se former par réaction de dimérisation lors d'une charge thermique de 6-aminocapronitrile, est inférieure à 1 % en poids, et, c) on sépare l'hexaméthylènediamine présente, totalement ou partiellement, à partir du mélange (II), en maintenant un mélange (IV) dont la teneur en hexaméthylènediamine est plus grande que dans le mélange (II), et un mélange (V) dont la teneur en hexaméthylènediamine est plus faible que dans le mélange (II).

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