Dual bed xylene isomerization

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 15/08 (2006.01) C07C 5/27 (2006.01)

Patent

CA 2203365

A mixture of aromatic hydrocarbons, comprising ethylbenzene and at least one xylene, is isomerized using a two component catalyst system to convert the ethylbenzene to compounds that may be removed from the aromatic hydrocarbon stream and to produce a product stream wherein the para-xylene concentration is approximately equal to the equilibrium ratio of the para-isomer. The first catalyst comprises an intermediate pore size zeolite that is effective for ethylbenzene conversion. The first catalyst is preferably silica-bound. The second catalyst comprises an intermediate pore size zeolite, which further has a small crystal size and which is effective to catalyze xylene isomerization. Each of the catalysts of this invention may contain one or more hydrogenation/dehydrogenation component.

La présente invention concerne l'isomérisation d'un mélange d'hydrocarbures aromatiques comprenant de l'éthylobenzène et au moins un xylène. Le procédé met en oeuvre un système catalyseur bi-composant permettant, non seulement la conversion de l'éthylobenzène en composés éliminables du flux d'hydrocarbures aromatiques, mais aussi la production d'un flux de produit dans lequel la concentration en para-xylène est approximativement égale au rapport d'équilibre du para-isomère. Le premier catalyseur comporte un zéolite, dont les pores présentent une taille intermédiaire, et qui convient à la conversion éthylobenzénique. Ce premier catalyseur comporte de préférence une liaison silice. Le second catalyseur comporte un zéolite, dont les pores présentent une taille intermédiaire, dont les cristaux sont de petit calibre, et qui convient à la catalyse d'isomérisation du xylène. Chacun des catalyseurs peut contenir un ou plusieurs composants d'hydrogénation/déshydrogénation.

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