PROCESS FOR MAKING HIGH OCTANE GASOLINE WITH REDUCED BENZENE CONTENT BY BENZENE ALKYLATION AT HIGH BENZENE CONVERSION

摘要

A process for the alkylation of a benzene-containingrefinery stream such as reformate with light refineryolefins which is capable of achieving high benzeneconversion levels operates in a fixed bed of an MWW zeo-litecatalyst, preferably MCM- 22, in single pass mode inthe liquid phase at a relatively low to moderate temperatureswith pressure maintained at a value adequate to ensuresubcritical operation. High levels of benzene conversionwith conversions of at least 90% and higher, e.g. 92%or 95% or even higher are achievable. A high octane productis produced, comprising mono-, di- and tri-alkylbenzeneswith lesser levels of the tetra-substituted products.By operating with staged olefin injection, the end point ofthe alkylation product can be maintained at a low valuewhile, at the same time, achieving high levels of benzeneand olefin conversion.