Process for Xylenes Isomerization
AssigneeExxonMobil Chemical Patents Inc.
InventorsBrian M. Weiss, Darryl D. Lacy, Scott J. Weigel
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Abstract
A process for the isomerization of a para-xylene depleted, meta-xylene rich stream under at least partially liquid phase conditions using ZSM-23 with an external surface area of at least 75 m2/g (indicating a small crystallite size), and a SiO2/Al2O3 ratio between 15 and 75 that produces a higher than equilibrium amount of para-xylene, i.e., more than about 24 wt % of para-xylene, based on the total amount of xylenes.
Claims10
A process for producing para-xylene comprising contacting a feed stream comprising meta-xylene with a catalyst comprising ZSM-23 having a SiO2/Al2O3 ratio between 15 and 75 and an external surface area of at least 75 m2/g under at least partially liquid phase conditions effective to produce a first isomerized stream comprising para-xylene having a para-xylene content of more than 24 wt %, based on the total amount of xylenes in the first isomerized stream.
Dependencies are inferred from the claim text.