Method for obtaining hexamethylene diamine from mixtures...

C - Chemistry – Metallurgy – 07 – C

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Details

C07C 209/84 (2006.01) C07C 211/12 (2006.01)

Patent

CA 2280889

The invention relates to a method for obtaining hexamethylene diamine (I) from a mixture (II) containing (I) hexamethylene diamine, (III) hexamethylenimine, (IV) a compound selected from the group consisting of 2-aminomethyl cyclopentylamine and 1,2-diaminocyclohexane, (V) an imine, and (VI) adipodinitrile and 6- aminocaproic acid nitrile. According to said method, (a) a mixture (II) is subjected to distillation, yielding (a1) a low-boiling fraction which essentially contains (III), (a2) a medium-boiling fraction (VII) containing (I), (IV) and (V), and (a3) a high-boiling fraction containing (V) and (VI); (b) a mixture (VII) is subjected to distillation, yielding (b1) an overhead which essentially contains (IV) and (b2) a mixture (VIII) containing (I) and (V) as bottom residue; and (c) a mixture (VIII) is subjected to distillation, yielding (c1) (I) as overhead and (c2) a bottom residue which contains the essential part of (V).

L'invention concerne un procédé de préparation de diamine d'hexaméthylène (I) à partir d'un mélange (II) contenant: (I) de la diamine d'hexaméthylène, (III) de l'imine d'hexaméthylène, (IV) un composé sélectionné dans le groupe comprenant de la 2-aminométhylcyclopentylamine et du 1,2-diaminocyclohexane, (V) une imine, (VI) un adipodinitrile et du nitrile de 6-aminoacide caproïque. Selon le procédé, (a) on soumet à une distillation un mélange (II) pour obtenir (a1) une fraction à faible point d'ébullition qui contient principalement (III), (a2) une fraction (VII) à point d'ébullition moyen qui contient (I), (IV), (V) et (a3) une fraction à point d'ébullition élevé qui contient (V) et (VI); (b) on soumet un mélange (VII) à une distillation pour obtenir (b1) un produit de tête qui contient principalement (IV) et (b2) un mélange (VIII) contenant (I) et (V) comme résidu de distillation et (c) on soumet un mélange (VIII) à une distillation pour obtenir (c1) (I) comme produit de tête et (c2) un résidu de distillation qui contient la majeure partie de (V).

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