Process for isomerizing alkylaromatics

Details Process for isomerizing alkylaromatics Process for isomerizing alkylaromatics

1976-09-24

1977-12-13

O'Keefe, Veronica

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260674H, C07C 1508

Patent

active

040629031

ABSTRACT:
A process is disclosed for producing a selected C.sub.8 alkylaromatic isomer from a feedstock containing a less than equilibrium concentration of the selected isomer and a low C.sub.8 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 C.sub.8 naphthenes and a partially isomerized mixture of C.sub.8 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.

REFERENCES:
patent: RE25753 (1965-04-01), Holm
patent: 3078318 (1963-02-01), Berger
patent: 3642925 (1972-02-01), Rausch
patent: 3766287 (1973-10-01), Stenmark et al.

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