Continuous process for preparing ethylbenzene using liquid...

Details Continuous process for preparing ethylbenzene using liquid... Continuous process for preparing ethylbenzene using liquid...

C - Chemistry, Metallurgy

07

C

C07C 15/073 (2006.01) C07C 2/66 (2006.01) C07C 6/12 (2006.01)

Patent

CA 2206529

The present invention relates to a process for preparing ethylbenzene using liquid phase alkylation and vapor phase transalkylation. The liquid phase alkylation reaction may be catalyzed by an acidic solid oxide, such as MCM-22, MCM-49 and MCM-56. The vapor phase transalkylation may be catalyzed by a medium-pore size zeolite such as ZSM-5. The process may be run continuously with the continuous introduction of fresh benzene feed containing at least 500 ppm of nonbenzene hydrocarbon impurities. The combined ethylbenzene product of these alkylation and transalkylation reactions has very low levels of impurities including xylene, hydrocarbons having 7 or less carbon atoms and hydrocarbons having 9 or more carbon atoms.

L'invention concerne un processus destiné à la préparation d'éthylbenzène par alkylation en phase liquide et transalkylation en phase vapeur. La réaction d'alkylation en phase liquide peut être catalysée par un oxyde solide acide, tel que le MCM-22, le MCM-49, le MCM-56. La réaction de transalkylation en phase vapeur peut être catalysée par du zéolite de dimension de pores moyenne tel que le ZSM-5. On peut exécuter ce processus en continu en ajoutant de manière continuelle un apport de benzène frais contenant au minimum 500 mg/l d'impuretés d'hydrocarbures non benzéniques. Le produit combiné d'éthylbenzène obtenu par ces réactions d'alkylation et de transalkylation possède très peu d'impuretés, constituées de xylène, d'hydrocarbures à 7 atomes de carbone ou moins et d'hydrocarbures à 9 atomes de carbone ou moins.

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