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US 4,694,114 AGranted
Process for isomerizing alkyl aromatic hydrocarbons utilizing ZSM-23 zeolite and a hydrogenation/dehydrogenation metal
AssigneeMobil Oil Corporation
InventorsYung-Feng Chu, James C. Vartuli
Life of this patent
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Abstract
Alkyl aromatic hydrocarbons including ethyl benzene are isomerized to xylenes utilizing a catalyst consisting essentially of ZSM-23 zeolite, platinum (or other metal such as palladium, nickel, gold, zinc, or gallium) and an alumina support.
Claims6
A process for producing a near equilibrium mixture of xylenes from a feed comprising ethylbenzene and mixed xylenes which comprises contacting the feed with hydrogen in the presence of a catalyst composition consisting essentially of 0.1 to 1 weight percent of a hydrogenation/dehydrogenation metal, 5 to 97 weight percent alumina and 3 to 80 weight percent ZSM-23 zeolite
- wherein catalyst contact with the feed is undertaken at a weight hourly space velocity of 0.5 to 15 based on the catalyst, a pressure of from between 0 to 1000 psig and a temperature of from between 600.degree. F. and 900.degree. F., and
- wherein ZSM-23 is steamed prior to hydrogenation/dehydrogenation metal incorporation into the catalyst composition.
Dependencies are inferred from the claim text.