C.sub.8 alkyl aromatic hydrocarbon isomerization process

Details C.sub.8 alkyl aromatic hydrocarbon isomerization process C.sub.8 alkyl aromatic hydrocarbon isomerization process

C - Chemistry, Metallurgy

07

C

260/689.5

C07C 5/27 (2006.01) C07C 15/08 (2006.01)

Patent

CA 1081716

IMPROVED C8 ALKYL AROMATIC HYDROCARBON ISOMERIZATION PROCESS ABSTRACT OF THE DISCLOSURE An improved C8 alkyl aromatic hydrocarbon isomerization process comprising the steps of (1) contacting the feedstock with an isomerization catalytic composite in the presence of hydrogen at isomerization conditions to isomerize at least a portion of the C8 alkyl aromatic hydrocarbons and to produce an effluent; (2) separating the effluent to form a hydrogen-rich gaseous fraction, a first hydrocarbon-rich fraction containing toluene and having a lower average molecular weight relative to C8 alkyl aromatic content, and a second fraction enriched in C8 alkyl aromatic content relative to the effluent; provided that at least a portion of the first hydrocarbon-rich fraction is subjected to the contacting of step (1); and (3) recovering at least one C8 alkyl aromatic product from the second fraction. Improved yields of specific desired C8 hydrocarbon isomers and more effi- cient and complete C8 alkyl aromatic isomerization are among the benefits obtained.

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