Patent ID: 8637720

Claim:
A method of minimizing alkylation catalyst regeneration comprising: contacting an alkyl aromatic hydrocarbon with a first preliminary alkylation catalyst containing a zeolite selected from a group consisting of PSH-3, SSZ-25, ERB-1, ITQ-1, MCM-36, ZSM-22, ZSM-23, ZSM-48, and combinations thereof, and then a second preliminary alkylation catalyst comprising a Y zeolite to form a first output stream prior to contact with an alkylation catalyst; wherein the first preliminary alkylation catalyst comprises from about 50 wt. % to about 90 wt. % of a total weight of the first preliminary alkylation catalyst and the second preliminary alkylation catalyst, substantially continuously contacting the first output stream with the alkylation catalyst comprising a zeolite beta in the presence of an alkylating agent to form a second output stream; and withdrawing the second output stream.