Process to control conversion of c4+ and heavier stream to...

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 11/02 (2006.01) B01J 29/85 (2006.01) C07C 1/20 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2399213

A method for converting heavy olefins present in a product stream exiting a first reaction zone into light olefins and carbonaceous deposits on a catalyst without separation of the heavy olefins from the product stream exiting the first reaction zone. The method comprises creating the product stream exiting the first reaction zone, the product stream exiting the first reaction zone comprising the heavy olefins, moving the product stream exiting the first reaction zone to a second reaction zone without separation of the heavy olefins from the product stream exiting the first reaction zone, and contacting the product stream exiting the first reaction zone with the catalyst under conditions effective to form the light olefins, the contacting causing the carbonaceous deposits to form on at least a portion of the catalyst.

L'invention concerne un procédé permettant de transformer des oléfines lourds, présents dans un courant de produit provenant d'une première zone de réaction, en oléfines légers et en dépôts carbonés sur un catalyseur sans séparer les oléfines lourds dudit courant. Le procédé consiste à faire sortir un courant de produit de la première zone de réaction, lequel courant comprend les oléfines lourds; à déplacer le courant de produit susmentionné vers une seconde zone de réaction sans séparer les oléfines lourds du courant de produit provenant de la première zone de réaction; puis à mettre en contact le courant de produit sorti de la première zone de réaction avec le catalyseur dans des conditions permettant de former les oléfines légers. Le contact provoque la formation de dépôts carbonés sur au moins une portion du catalyseur.

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