Process for recovering acrylonitrile or methacrylonitrile

Details Process for recovering acrylonitrile or methacrylonitrile Process for recovering acrylonitrile or methacrylonitrile

C - Chemistry, Metallurgy

07

C

C07C 253/26 (2006.01) C07C 253/34 (2006.01) C07C 255/08 (2006.01)

Patent

CA 2516401

A process for the recovery of acrylonitrile or methacrylonitrile from an aqueous solution comprising subjecting the said solution to a water extractive distillation by feeding the solution to a distillation column and performing said extractive distillation and using solvent water introduced at the top of said column, removing a first overhead vapor stream of acrylonitrile or methacrylonitrile with some water from the top of the column, and a first liquid stream containing water and impurities from the bottom of the column, the contents of said column maintained at a substantially neutral pH by adding a sufficient amount of at least one alkaline compound selected from ammonium carbonate, ammonium bicarbonate, ammonium carbamate, and aikylene diamines to the overhead decanter and/or to the solvent water.

L'invention concerne un procédé de récupération d'acrylonitrile ou de méthacrylonitrile d'une solution aqueuse. Ce procédé permet de soumettre cette solution à une distillation extractive d'eau. Pour ce faire, on introduit la solution dans une colonne de distillation et on effectue cette distillation extractive en introduisant l'eau solvant par le haut dans la colonne et en retirant un premier courant de vapeur-produit de tête d'acrylonitrile ou de méthacrylonitrile et un peu d'eau du sommet de la colonne, et un premier courant liquide contenant de l'eau et des impuretés du fond de la colonne, les contenus de cette colonne étant maintenus à un pH sensiblement neutre par l'addition d'une quantité suffisante d'au moins un composé alcalin sélectionné parmi du carbonate d'ammonium, du bicarbonate d'ammonium, du carbamate d'ammonium et des diamines d'alkylène, dans le décanteur de tête et/ou l'eau solvant.

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