Production and recovery of para-xylene

Details Production and recovery of para-xylene Production and recovery of para-xylene

1977-09-26

1978-10-03

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

208143, 208310Z, 260668A, 260674A, C07C 713, C07C 522

Patent

active

041184297

ABSTRACT:
A C.sub.8 -aromatic hydrocarbon mixture containing para-xylene is subjected to adsorption-separation in contact with a crystalline aluminosilicate adsorbent which selectively retains para-xylene. Raffinate therefrom, being a para-xylene deficient C.sub.8 -aromatic concentrate, is isomerized in contact with a catalytic composite containing a Group VIII noble metal component to form additional para-xylene. Isomerization conditions employed to produce the para-xylene, also effect the formation of olefinic material. To prevent the adverse effect which olefins exhibit toward the efficiency and capacity of the zeolitic adsorbent, the isomerization effluent is subjected to hydrotreating at conditions which provide a liquid-phase operation and saturate olefins without saturation of the C.sub.8 -aromatics. The hydrotreating is effected in contact with a substantially non-acidic catalytic composite comprising a Group VIII noble metal component.

REFERENCES:
patent: 3201344 (1965-08-01), Broughton
patent: 3239455 (1966-03-01), Lickus et al.
patent: 3636121 (1972-01-01), Stine et al.
patent: 3700744 (1972-10-01), Berger et al.
patent: 3707550 (1972-12-01), Stine et al.

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