Critical phase alkylation process

Details Critical phase alkylation process Critical phase alkylation process

2005-08-02

2008-09-02

Wood, Elizabeth D (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

C502S038000, C502S041000, C502S052000

Reexamination Certificate

active

07419929

ABSTRACT:
A process for the production of ethylbenzene by the ethylation of benzene in the critical phase over a molecular sieve aromatic alkylation catalyst comprising cerium-promoted zeolite beta. An aromatic feedstock having a benzene content of at least 90 wt. % is supplied into a reaction zone and into contact with the cerium-promoted zeolite beta having a silica/alumina mole ratio within the range of 50-150 and a cerium-aluminum ratio of 0.5-1.5. Ethylene is supplied to the alkylation reaction zone in an amount to provide a benzene/ethylene mole ratio of 1-15. The reaction zone is operated at temperature and pressure conditions in which benzene is in the super critical phase to cause ethylation of the benzene in the presence of the cerium zeolite beta alkylation catalyst. An alkylation product is produced containing ethylbenzene as a primary product with the attendant production of heavier alkylated by-products of no more than 60 wt. % of the ethylbenzene. The critical phase alkylation reaction may be followed by the transalkylation of a polyalkylated aromatic component.

REFERENCES:
patent: 6987078 (2006-01-01), Kelly et al.
patent: 7053260 (2006-05-01), Xu et al.
patent: 7256318 (2007-08-01), Lattner et al.
patent: 7259283 (2007-08-01), Kelly et al.

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