Process for obtaining high-purity 1-butene from c4...

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 7/00 (2006.01) C07C 11/08 (2006.01) C07C 11/09 (2006.01)

Patent

CA 2749346

A process is described for obtaining high-purity 1-butene starting from C4 hydrocarbon mixtures containing isobutene, n-butane, isobutane, 1, 3 -butadiene, 1-butene, 2- butenes and also optionally C3 and C5 hydrocarbons, comprising the following stages: conversion of isobutene effected in a double stage, wherein each stage consists of one or more reactors followed by a distillation column for the recovery of the reaction product; recovery of the excess alcohol; recovery of 1-butene using at least two distillation columns; characterised in that it also uses a further conversion stage, consisting of one or more reactors in series, for completing the isobutene removal.

L'invention porte sur un procédé pour l'obtention de 1-butène de haute pureté à partir de mélanges d'hydrocarbures en C4 contenant de l'isobutène, du n-butane, de l'isobutane, du 1,3 butadiène, du 1-butène, des 2-butènes et également éventuellement des hydrocarbures en C3 et en C5, comportant les étapes suivantes : la conversion de l'isobutène effectuée dans un système à deux étages, chaque étage étant constitué d'un ou plusieurs réacteurs suivis par une colonne de distillation pour la récupération du produit réactionnel ; la récupération de l'alcool en excès ; la récupération du 1-butène à l'aide d'au moins deux colonnes de distillation ; caractérisé en ce qu'il utilise également un autre étage de conversion consistant en un ou plusieurs réacteurs en série, pour achever l'élimination de l'isobutène.

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