Process for the selective preparation of dib from an...

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 2/24 (2006.01) C07C 5/22 (2006.01) C07C 7/163 (2006.01) C07C 11/02 (2006.01)

Patent

CA 2355445

The invention relates to a process for preparing diisobutylene (DIB) from an i-butene-containing C4 raffinate I, in which the C4 stream is passed through a first hydroisomerization reactor (A) and a fractionation column (B) and is thus largely freed of 1-butene and 2-butene. It is subsequently dimerized over an acidic catalyst installed in a reactive column (E). The feed stream to this reactive column contains not only i-butene but also butanes which make the reaction temperature in the fixed bed controllable by removal of the heat of reaction. In the fractionation column (B), a side stream can be subjected to a further hydroisomerization in a reactor (C).

L'invention concerne un procédé pour la préparation de diisobutylène (DIB) à partir d'un raffinat C4 I contenant de l'i-butène, dans lequel l'écoulement C4 passe par un premier réacteur de hydroisomérisation (A) et une colonne de fractionnement (B) et, par le fait même, est largement exempt de 1-butène et de 2-butène. Il est ensuite dimérisé sur un catalyseur acide installé dans une colonne réactive (E). L'écoulement d'entrée dans cette colonne réactive contient non seulement de l'i-butène mais aussi des butanes qui rendent la température de réaction dans le lit fixe contrôlable par le retrait de la chaleur de réaction. Dans la colonne de fractionnement (B), un écoulement latéral peut être assujetti à une hydroisomérisation supplémentaire dans un réacteur (C).

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