Process for the production of alkylated benzenes

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 15/02 (2006.01) C07C 2/64 (2006.01) C07C 2/66 (2006.01) C07C 6/12 (2006.01) C07C 7/12 (2006.01) C07C 7/13 (2006.01) C07C 15/073 (2006.01) C07C 15/085 (2006.01) C07C 37/14 (2006.01) C07C 39/06 (2006.01)

Patent

CA 2262661

A process of preparing an alkylated benzene or mixture of alkylated benzenes involving contacting a benzene feedstock with a solid acid, such as an acidic clay or acid zeolite, in a pretreatment zone at a temperature greater than about 130 °C but less than about 300 °C to form a pretreated benzene feedstock, and thereafter contacting the pretreated benzene feedstock with (a) an alkylating agent in an alkylation zone or (b) a transalkylating agent in a transalkylation zone, in the presence of an alkylation/transalkylation catalyst so as to prepare the alkylated benzene or mixture of alkylated benzenes. The pretreatment step improves the lifetime of the alkylation/transalkylation catalyst. Preferred products are ethylbenzene and cumene.

L'invention concerne un procédé de préparation d'un benzène alkylé ou d'un mélange de benzènes alkylés, comprenant la mise en contact d'une charge d'alimentation de benzène avec un acide solide, tel qu'une argile acide ou une zéolite d'acide, dans une zone de prétraitement à une température supérieure à environ 130 DEG C, mais inférieure à environ 300 DEG C, pour former une charge d'alimentation de benzène prétraitée; ensuite, on met la charge d'alimentation de benzène prétraitée en contact avec (a) un agent alkylant dans une zone d'alkylation, ou (b) un agent transalkylant dans une zone de transalkylation, en présence d'un catalyseur d'alkylation/transalkylation afin de préparer le benzène alkylé ou le mélange de benzènes alkylés. L'étape de prétraitement accroît la durée de vie du catalyseur d'alkylation/transalkylation. De préférence, on utilise de l'éthylbenzène et de l'isopropylbenzène.

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