Method for inhibiting polymerization during the recovery and...

C - Chemistry – Metallurgy – 07 – C

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C07C 253/24 (2006.01) C07C 253/26 (2006.01) C07C 253/32 (2006.01) C07C 255/08 (2006.01)

Patent

CA 2506409

Economical processes are disclosed for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gaseous. Processes of the invention include quenching the gaseous reactor effluent with an aqueous quench liquid; forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co- products; and using an integrated sequence of distillations and phase separations to recover for recycle of a useful aqueous liquid, and obtain the desired nitrogen-containing products. According to the invention aqueous solutions are fractionated in an integrated system of multi-stage columns while an effective polymerization inhibiting amount of at least one member of a preselected class of p~-phenylenediamine compounds is maintained therein.

L'invention concerne des procédés économiques permettant de récupérer et de raffiner des composés organiques contenant de l'azote formés par oxydation catalytique d'au moins un composé nutritif choisi dans le groupe propane, propylène, isobutane et isobutylène en présence d'ammoniaque afin de produire un gaz. Des procédés de l'invention consistent à tremper l'effluent de réacteur gazeux dans un liquide de trempage aqueux ; à former une solution aqueuse contenant les mononitriles non saturés correspondants, le cyanure d'hydrogène, et d'autres co-produits organiques ; et à utiliser une séquence intégrée de distillations et des séparations de phase à récupérer en vue du recyclage d'un liquide aqueux utile, et en vue d'obtenir les produits contenant de l'azote désirés. Selon l'invention, des solutions aqueuses sont fractionnées dans un système intégré de colonnes multi-étages pendant qu'une quantité inhibitrice de polymérisation efficace d'au moins un élément d'une classe présélectionnée de composés de p-phenylenediamine est conservée.

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