Process for producing para-xylene

Details Process for producing para-xylene Process for producing para-xylene

2007-04-10

2008-10-21

Dang, Thuan Dinh (Department: 1797)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

C585S477000

Reexamination Certificate

active

07439412

ABSTRACT:
A process for producing a PX-rich product comprises (a) separating a feedstock containing C8hydrocarbons to produce a C8hydrocarbons rich stream; (b) separating at least a first portion of the C8hydrocarbons rich stream to produce a first PX-rich stream and a first PX-depleted stream; (c) isomerizing at least a portion of the first PX-depleted stream to produce a first isomerized stream having a higher PX concentration than the first PX-depleted stream; (d) separating a second portion of the C8hydrocarbons rich stream and/or at least a portion of the first isomerized stream to produce a second PX-rich stream and a second PX-depleted stream; (e) isomerizing at least a portion of the second PX-depleted stream to produce a second isomerized stream having a higher PX concentration than the second PX-depleted stream; (f) recovering at least a portion of at least one of the first and second PX-rich streams as PX-rich product; and (g) supplying at least a portion of at least one of the first isomerized stream, the second isomerized stream, the first PX-rich stream, and the second PX-rich stream to the separating (a).

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