Process for producing pentene-nitriles

Details Process for producing pentene-nitriles Process for producing pentene-nitriles

C - Chemistry, Metallurgy

07

C

C07C 255/07 (2006.01) C07C 253/00 (2006.01) C07C 253/20 (2006.01)

Patent

CA 2208254

The present invention relates to a process for producing pentene-nitriles. The pentene-nitriles, more particularly 3-pentene-nitrile and 4-pentene-nitrile, may give adiponitrile by reaction with hydrogen cyanide. More particularly, the invention relates to a process for preparing pentene-nitriles by implementing in vapor phase 2-methylglutarimide or ethylsuccinimide in the presence of a solid acid catalyst. 2-methylglutarimide may be implemented directly or in the form of one of the precursors thereof, such as particularly 4-cyanovaleramide, 2-methyl 4-cyanobutyramide, 4-cyanovaleric acid, 2-methyl 4-cyanobutyric acid. Likewise, ethylsuccinimide may be implemented directly or in the form of one of the precursors thereof, such as particularly 3-cyanovaleramide, 2-ethyl 3-cyanopropionamide, 3-cyanovaleric acid, 2-ethyl 3-cyanopropionic acid.

La présente invention concerne un procédé de préparation de pentène-nitriles. Les pentène-nitriles, plus particulièrement le 3-pentène-nitrile et le 4-pentène-nitrile, peuvent conduire à l'adiponitrile par réaction avec le cyanure d'hydrogène. Plus précisément, l'invention consiste en un procédé de préparation de pentène-nitriles par mise en oeuvre en phase vapeur de 2-méthylglutarimide ou d'éthylsuccinimide, en présence d'un catalyseur solide acide. Le 2-méthylglutarimide peut être mis en oeuvre directement ou sous la forme d'un de ses précurseurs, tels que notamment le 4-cyanovaléramide, le 2-méthyl 4-cyanobutyramide, l'acide 4-cyanovalérique, l'acide 2-méthyl 4-cyanobutyrique. De même, l'éthylsuccinimide peut être mis en oeuvre directement ou sous la forme d'un de ses précurseurs, tels que notamment le 3-cyanovaléramide, le 2-éthyl 3-cyanopropionamide, l'acide 3-cyanovalérique, l'acide 2-éthyl 3-cyanopropionique.

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