06222084 is referenced by 20 patents and cites 9 patents.

Process for the production of ethylbenzene by alkylation over a silicalite alkylation catalyst with subsequent transalkylation of diethylbenzene with the alkylation catalyst and conditions selected to retard xylene production and also heavies production. Benzene and ethylene are applied to a multi-stage alkylation reaction zone having a plurality of series-connected catalyst beds containing silicalite of a predominantly monoclinic symmetry having a silica/alumina ratio of at least 275. Gas-phase ethylation of benzene is at a flow rate to provide a space velocity of benzene over the catalyst to produce a xylene concentration of about 600 ppm or less of the ethylbenzene content. Periodically the space velocity may be increased to a value which is greater than the space velocity associated with a minimum concentration of diethylbenzene in the alkylation product such that diethylbenzene production is enhanced while minimizing any attendant transalkylation reactions within the alkylation reaction zone. The alkylation reactor output is applied to an intermediate recovery zone for the separation and recovery of ethylbenzene with the recovery of a polyalkylated aromatic component which is supplied along with benzene to a transalkylation reaction zone for disproportionation to provide a reduced diethylbenzene content and an enhanced ethylbenzene content. A specific monoclinic silicalite alkylation catalyst has a silica/alumina ratio of at least 300 and has a crystal size of less than one micron.

Title
Gas phase alkylation-liquid phase transalkylation process
Application Number
9/289488
Publication Number
6222084 (B1)
Application Date
April 9, 1999
Publication Date
April 24, 2001
Inventor
James R Butler
Houston
TX, US
James T Merrill
Katy
TX, US
Ashim Kumar Ghosh
Houston
TX, US
Agent
Jim D Wheelington
US
William D Jackson
US
Assignee
Fina Technology
TX, US
IPC
C07C 2/66
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