Method for producing linear pentenenitrile

Details Method for producing linear pentenenitrile Method for producing linear pentenenitrile

C - Chemistry, Metallurgy

07

C

C07C 253/10 (2006.01) C07C 255/07 (2006.01)

Patent

CA 2554736

The invention relates to a method for producing 3-pentenenitrile, characterised by the following steps: (a) isomerisation of an educt stream containing 2-methyl-3-butenenitrile on at least one dissolved or dispersed isomerisation catalyst to form a stream (1), which contains the isomerisation catalyst(s), 2-methyl-3-butenenitrile, 3-pentenenitrile and (Z)-2-methyl-2- butenenitrile; (b) distillation of the stream (1) to obtain a stream (2) as the overhead product, which contains 2-methyl-3-butenenitrile, 3- pentenenitrile and (Z)-2-methyl-2-butenenitrile and a stream (3) as the bottom product, which contains the isomerisation catalyst(s); (c) distillation of the stream (2) to obtain a stream (4) as the overhead product, which is enriched with (Z)-2-methyl-2-butenenitrile in comparison to stream (2), (in relation to the sum of all pentenenitriles in stream (2)) and a stream (5) as the bottom product, which is enriched with 3-pentenenitrile and 2-methyl-3-butenenitrile in comparison to stream (2), (in relation to the sum of all pentenenitriles in stream (2); (d) distillation of stream (5) to obtain a stream (6) as the bottom product, which contains 3-pentenenitrile and a stream (7) as the head product, which contains 2-methyl-3-butenenitrile.

L'invention concerne un procédé de production de 3-pentène-nitrile caractérisé par les étapes suivantes: (a) isomérisation d'un flux d'éduit contenant du 2-méthyle-3-butène-nitrile sur au moins un catalyseur d'isomérisation dissous ou dispersé pour obtenir un flux 1 contenant au moins un catalyseur d'isomérisation, 2-méthyle-3-butène-nitrile, 3-pentène-nitrile et (Z)-2-méthyle-2-butène-nitrile; (b) distillation du flux 1 avec obtention, comme produit de tête, d'un flux 2 contenant 2-méthyle-3-butène-nitrile, 3-pentène-nitrile et (Z)-2-méthyle-2-butène-nitrile et, comme produit de bas de colonne, un flux 3 contenant au moins un catalyseur d'isomérisation; (c) distillation du flux 2 avec obtention, comme produit de tête, d'un flux 4 qui, par rapport au flux 2, est enrichi en (Z)-2-méthyle-2-butène-nitrile par rapport à la somme de tous les pentènenitriles du flux 2 et, comme produit de bas de colonne, un flux 5 qui, par rapport au flux 3, est enrichi en 3-pentène-nitrile et 2-méthyle-3-butène-nitrile par rapport à la somme de tous les pentènenitriles du flux 2; (d) distillation du flux 5 avec obtention, comme produit de bas de colonne, d'un flux 6 contenant du 3-pentène-nitrile et, comme produit de tête, un flux 7 contenant du 2-méthyle-3-butène-nitrile.

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