The present invention provides an integrated process for the production of p-
xylene, comprising the steps of A) separating a mixed feedstock containing
benzene,
toluene, C8 aromatic hydrocarbons, C9 and higher aromatic hydrocarbons, and non-aromatic hydrocarbons from a reforming unit, to obtain a first
benzene stream, a first
toluene stream, a first C8
aromatic hydrocarbon stream, a stream of C9 and higher aromatic hydrocarbons, and a stream of non-aromatic hydrocarbons; B) feeding the stream of C9 and higher aromatic hydrocarbons from step A) to a C9 and higher
aromatic hydrocarbon dealkylation unit, where dealkylation reaction occurs in the presence of
hydrogen, and separating the reaction
effluent to obtain a second
benzene stream, a second
toluene stream, and a second C8
aromatic hydrocarbon stream; C) feeding both the first toluene stream and the second toluene stream to a toluene selective
disproportionation unit, where toluene selective
disproportionation reaction occurs in the presence of
hydrogen to produce a stream containing C8 aromatic hydrocarbons including p-
xylene and benzene, which stream is separated to obtain a third C8 aromatic
hydrocarbon stream, a third toluene stream, and a third benzene stream, with the third toluene stream being returned to an inlet of this unit; D) feeding both the first C8 aromatic
hydrocarbon stream and the second C8 aromatic
hydrocarbon stream to an
adsorption separation unit, to obtain a first p-
xylene product stream and a fifth C8 aromatic hydrocarbon stream, with the fifth C8 aromatic hydrocarbon stream being passed to an
isomerization unit; E) feeding the third C8 aromatic hydrocarbon stream to a
crystallization separation unit, to obtain a fourth C8 aromatic hydrocarbon stream and a second p-xylene product stream, with the fourth C8 aromatic hydrocarbon stream being passed to the
adsorption separation unit or the
isomerization unit; and F) feeding an
effluent of the
isomerization unit to an inlet of the
adsorption separation unit.