| 摘要 |
A process is disclosed for producing a selected C8 alkylaromatic isomer from a feedstock containing a less than equilibrium concentration of the selected isomer and a low C8 naphthenes concentration, in which the feedstock is first contacted with a platinum-halogen catalyst at low temperature isomerization conditions to form an intermediate reaction mixture containing a substantial amount of C8 naphthenes and a partially isomerized mixture of C8 alkylaromatics; the intermediate mixture is then contacted with another platinum-halogen catalyst at higher temperature dehydrogenation conditions to form a final product mixture with a very low naphthenes content and a substantially equilibrium concentration of the selected isomer; and the selected xylene isomer is recovered from the final product mixture. |
