catalytic composition and process employing it for alkylation of aromatic hydrocarbons with alcohols, or mixtures of alcohols and olefins

摘要

The invention relates to a novel catalytic composition for the alkylation of aromatic compounds with alcohols, or mixtures of corresponding alcohols and olefins, wherein said composition comprises a mwt type zeolite and is characterized in that it contains one or more alkali metals. , in a total amount that is less than or equal to 0.02% by weight. The use of said catalyst in the alkylation of aromatic compounds with alcohols, in particular benzene with isopropanol or ethane, allows the formation as byproduct of the aldehyde or ketone corresponding to the alcohol used to be minimized: the formation of reaction byproducts of said aldehydes. or ketones having a boiling point very close to that of polyalkylation products is therefore significantly reduced. This provides a considerable advantage in the subsequent transalkylation step for the recovery of said polyalkylates by transformation into the corresponding monoalkylates.