Liquid phase process for C8 alkylaromatic isomerization

Details Liquid phase process for C8 alkylaromatic isomerization Liquid phase process for C8 alkylaromatic isomerization

2005-03-29

2005-03-29

Dang, Thuan D (Department: 1764)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

Reexamination Certificate

active

06872866

ABSTRACT:
A liquid or partially liquid phase process for isomerizing a non-equilibrium mixture of xylenes and ethylbenzene uses a zeolitic catalyst system preferably based on zeolite beta and on pentasil-type zeolite. The invention obtains an improved yield of para-xylene from the mixture relative to prior art processes in a more economical manner. A preferred beta zeolite is a surface-modified zeolite beta resulting from acid washing of a templated native zeolite at conditions insufficient to effect bulk dealumination. A preferred pentasil zeolite is a MTW-type with a silica-to-alumnina ratio between 20 and 45.

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