Patent ID: 6057485
Filing Date: 2000-05-02
Classification: C07C

Abstract:
A method for the vapor-phase alkylation of an aromatic substrate comprising:providing a multi-stage alkylation reaction zone having a plurality of series-connected catalyst beds, at least one catalyst bed containing a first monoclinic silicalite catalyst having a selected silica/alumina ratio and at least one other catalyst bed containing a second monoclinic silicalite catalyst having a selected silica/alumina ratio that is less than that of the first catalyst;introducing a feedstock of an aromatic substrate and an alkylating agent into the multistage alkylation reaction zone;operating the multistage alkylation reaction zone at temperature and pressure conditions in which the aromatic substrate is in a gaseous phase to cause gas-phase alkylation of the aromatic substrate in the presence of the monoclinic silicalite catalysts to produce an alkylation product; andwithdrawing the alkylation product from the multistage alkylation reaction zone.