Process for the separation of isobutene from normal butenes

C - Chemistry – Metallurgy – 07 – C

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C07C 7/163 (2006.01) C07C 5/13 (2006.01) C07C 5/25 (2006.01) C07C 7/148 (2006.01)

Patent

CA 2379348

A process for the separation of isobutene, otherwise inseparable from butene-1 by fractionation, in high purity from butenes contained in a mixed hydrocarbon stream containing butene-1, butene-2 and small amounts of butadiene in which the mixed hydrocarbon stream (107) is fed to distillation column reactor (40) containing an alumina supported palladium oxide catalyst. The column is operated to tend to exclude butene-2 from contact with the catalyst and to maintain butene-1 in contact with the catalyst to isomerize the butene-1 to butene-2. As butene-2 is produced it is distilled away from the catalyst, upsetting the equilibrium and allowing for a greater than equilibrium amount of butene-2. The isobutene and isobutane are concurrently separated from butene-2. Additionally, any butadiene in the feed is hydrogenated to butenes. The bottoms (108) is rich in butene-2.

L'invention concerne un procédé de séparation d'isobutène de haute pureté, normalement inséparable du butène-1 par fractionnement, à partir de butènes contenus dans un flux d'hydrocarbures mélangé contenant du butène-1, du butène 2 et de petites quantités de butadiène, dans lequel le flux d'hydrocarbures mélangé (107) est distribué à un réacteur de colonne de distillation (40) contenant un catalyseur d'oxyde de palladium ayant pour support de l'alumine. Ladite colonne a tendance à empêcher le butène-2 d'entrer en contact avec le catalyseur et à maintenir le butène-1 en contact avec le catalyseur, afin d'isomériser le butène-1 au butène-2. Une fois produit, le butène-2 est distillé sans le catalyseur, par inversion de l'équilibre, ce qui permet de produire des quantités de butène-2 supérieures aux quantités d'équilibre. L'isobutène et l'isobutane sont séparés simultanément du butène-2. En outre, tous les butadiènes de l'alimentation sont hydrogénés aux butènes. Le résidu (108) est riche en butène-2.

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