Method for hydrogenating nitrile functions into amine functions

C - Chemistry – Metallurgy – 07 – C

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C07C 209/48 (2006.01) C07C 253/30 (2006.01) C07C 211/12 (2006.01) C07C 255/24 (2006.01)

Patent

CA 2403210

The invention concerns a method for hydrogenating nitrile functions into amine functions. More particularly, the invention concerns a method for total or partial hydrogenation of dinitrile compounds into diamine or aminonitrile compounds. The invention concerns a method for hydrogenating nitrile functions into amine functions, using hydrogen and in the presence of a hydrogenation catalyst and a strong mineral base preferably derived from an alkaline or alkaline-earth metal. The invention is characterised in that the method comprises a step which consists in conditioning the catalyst by mixing the hydrogenation catalyst, a specific amount of strong mineral base and a solvent wherein the strong mineral base is hardly soluble. Said solvent is an amine compound such as hexamethylene diamine in the case of hydrogenation of adiponitrile into HMD and/or aminocapronitrile.

La présente invention concerne un procédé d'hydrogénation des fonctions nitriles en fonction amines. Elle concerne plus particulièrement un procédé d'hydrogénation totale ou partielle de composés dinitriles en composés diamines ou aminonitriles. L'invention se rapporte à un procédé d'hydrogénation de fonctions nitriles en fonctions amines, à l'aide d'hydrogène et en présence d'un catalyseur d'hydrogénation et d'une base minérale forte dérivant de préférence d'un métal alcalin ou alcalino-terreux. Selon l'invention, le procédé comprend une étape de conditionnement du catalyseur consistant à mélanger le catalyseur d'hydrogénation, une quantité déterminée de base minérale forte et un solvant dans lequel la base minérale forte est peu soluble. Ce solvant est un composé aminé comme l'hexaméthylène diamine dans le cas de l'hydrogénation de l'adiponitrile en HMD et/ou aminocapronitrile.

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