Process for the deshydrocyanation of aliphatic dinitriles

Details Process for the deshydrocyanation of aliphatic dinitriles Process for the deshydrocyanation of aliphatic dinitriles

C - Chemistry, Metallurgy

07

C

C07C 255/09 (2006.01) C07C 253/30 (2006.01)

Patent

CA 2096612

This invention concerns a vapour phase aliphatic dinitrile deshydrocyanation process. It consists more specifically of a deshydrocyanation process of branched staurated aliphatic dinitriles, characterized by the fact that vapours from one or more of the said branched saturated aliphatic dinitriles are placed in contact with a catalyst including a partially or completely acidified cation exchanger, at a temperature ranging from 300.degrees.C to 600.degrees.C. The branched saturated aliphatic dinitriles subjected to deshydrocyanation according to the present process are, in particular, 2-methyl-glutaronitrile, 2-ethyl-succinonitrile, the mixtures of the two or the industrial mixtures containing them.

La présente invention concerne un procédé de déshydrocyanation de dinitriles aliphatiques en phase vapeur. Elle consiste plus précisément en un procédé de déshydrocyanation de dinitriles aliphatiques saturés ramifiés, caractérisé en ce que des vapeurs d'un ou plusieurs desdits dinitriles aliphatiques saturés ramifiés sont mises en contact avec un catalyseur comprenant un échangeur de cation partiellement ou complètement acidifié, à une température allant de 300°C à 600°C. Les dinitriles aliphatiques saturés ramifiés qui sont soumis à la déshydrocyanation selon le présent procédé sont plus particulièrement le 2-méthyl-glutaronitrile, le 2-éthyl-succinonitrile, leurs mélanges entre eux ou les mélanges industriels les contenant.

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