Aromatic alkylation process

C - Chemistry – Metallurgy – 07 – C

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C07C 2/66 (2006.01)

Patent

CA 2519849

In a method for producing monoalkylated aromatic compounds, an aromatic feed is contacted with an alkylating agent in the presence of a catalyst comprising a molecular sieve having an X- ray diffraction pattern including d-spacing maxima at 12.4~0.25, 6.9~0.15, 3.57~0.07, and 3.42~0.07 Angstrom. The catalyst also contains at least one metal cation selected from Groups 1-4 and 7-16 of the Periodic Table of Elements, wherein the metal cation is present in an amount of at least 0.5% by weight of the catalyst, whereby selectivity of the catalyst to produce monoalkylates over polyalkylates is improved as compared with the identical catalyst but without the metal cation present.

L'invention concerne un procédé qui permet de produire des composés aromatiques monoalkylés. On met une charge aromatique en contact avec un agent d'alkylation, en présence d'un catalyseur renfermant un tamis moléculaire à diagramme de diffraction des rayons X qui présente les maxima d'espacement d suivants: 12,4.plusmn.0,25, 6,9.plusmn.0,15, 3,57.plusmn.0,07, et 3,42.plusmn.0,07 angströms. Le catalyseur renferme aussi au moins un cation métallique appartenant aux groupes 1-4 et 7-16 du tableau des éléments périodiques. Le cation considéré est présent en quantité correspondant au moins à 0,5 % du catalyseur, en poids, et la sélectivité du catalyseur visant à produire des monoalkylats en plus grand nombre que les polyalkylats est améliorée par rapport à un catalyseur identique mais sans présence de cation métallique.

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