Importance

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Abstract

Process for the alkylation of aromatic substrates with a C.sub.2 -C.sub.4 alkylating agent over an alkylation catalyst comprising zeolite omega at moderate temperature conditions and under pressure to provide liquid phase conditions. The liquid phase alkylation process is carried out using a plurality of series connected reaction stages operated at an average temperature of no more than 300.degree. C. with the interstage injection of the C.sub.2 -C.sub.4 alkylating agent in a manner to maintain at least 2 mole percent of alkylating agent solubilized in the aromatic substrate. The reaction stages of a multistage system temperature and pressure conditions effective to cause are operated at a pressure above the vapor pressure of the aromatic substrate and below the vapor pressure of the alkylating agent at the alkylation reaction conditions. The aromatic substrate and the alkylating agent are supplied to a first of the reaction stages in relative amounts to provide a first mole ratio of aromatic substrate to alkylating agent. The effluent from the first reaction zone is supplied to a second reaction stage. Alkylating agent is separately supplied to the second reaction stage in an amount to provide a mole ratio of the aromatic substrate to the alkylating agent which is less than corresponding ratio of these reactants as supplied to the first recited alkylation stage.

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First Claim