Process for alkylating aromatics

C - Chemistry – Metallurgy – 07 – C

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C07C 2/66 (2006.01) C07C 15/073 (2006.01)

Patent

CA 2420468

A process for alkylating aromatics is provided which comprises contacting an aromatic-containing feed with alkylating agent in the presence of a silica- bound ZSM-5 zeolite catalyst, wherein the ZSM-5 has a crystal size no greater than 0.05 micron, said contacting being conducted under alkylating conditions to provide a product containing a monoalkylated aromatic fraction and a polyalkylated aromatic fraction, wherein the polyalkylated aromatic fraction contains at least 40 wt.% of the para-dialkylaromatic species. The polyalkylated aromatic fraction may be contacted with unsubstituted aromatic and a transalkylation catalyst under transalkylating conditions to provide a monoalkylated aromatic-rich stream, e.g., an ethylbenzene-rich stream.

L'invention concerne un procédé pour des aromatiques alkylants qui consiste à mettre en contact une charge contenant un aromatique avec un agent alkylant en présence d'un catalyseur zéolite ZSM-5 lié au silicium, dans lequel le ZSM-5 possède une taille de cristal inférieure à 0,05 micron. Ladite mise en contact étant réalisée dans des conditions alkylantes en vue d'obtenir un produit contenant une fraction aromatique monoalkylée et une fraction aromatique polyalkylée, dans lequel la fraction aromatique polyalkylée contient au moins 40 % par poids de la substance chimique dialkylaromatique para-. On peut mettre en contact la fraction aromatique polyalkylée avec un aromatique non-substitué et un catalyseur de transalkylation dans des conditions de transalkylation afin d'obtenir un flux riche en aromatique monoalkylé, par exemple, un flux riche en éthylbenzène.

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