Process for isomerizing non-equilibrium xylene-containing...

Details Process for isomerizing non-equilibrium xylene-containing... Process for isomerizing non-equilibrium xylene-containing...

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2578793

Reduced co-production of toluene and C9 and higher aromatics such as trimethylbenzene, methylethylbenzene, and diethylbenzene is achieved in processes for the isomerization of xylenes to close to equilibrium using a layered catalyst having a thin outer layer of molecular sieve and hydrogenation metal component on a core, wherein at least 75 mass-% of the hydrogenation metal component is in the outer layer.

La présente invention concerne une co-production réduite de toluène et de substances aromatiques en C<SUB>9</SUB> et supérieures telles que le triméthylbenzène, le méthyléthylbenzène ou le diéthylbenzène. Cette co-production réduite est obtenue dans des procédés d'isomérisation des xylènes jusqu'à un point proche de l'équilibre à l'aide d'un catalyseur stratifié qui comprend une couche externe mince de tamis moléculaire et un composant de métal d'hydrogénation sur un coer, au moins 75 % en masse du composant de métal d'hydrogénation se trouvant dans la couche externe.

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