Production and recovery of para-cymene

Details Production and recovery of para-cymene Production and recovery of para-cymene

1978-04-17

1978-12-05

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

208143, 260674SA, 260668A, C07C 713

Patent

active

041285930

ABSTRACT:
A mixture of cymene isomers, containing paracymene is subjected to adsorption-separation in contact with a crystalline aluminosilicate adsorbent which selectively retains para-cymene. Raffinate therefrom, being a para-cymene deficient mixture of cymene isomers, is isomerized to form additional para-cymene. Isomerization conditions employed to produce para-cymene, also effect 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 cymene isomers.

REFERENCES:
patent: 2585899 (1952-02-01), Langlois
patent: 3044964 (1962-07-01), Morrell
patent: 3201344 (1965-08-01), Broughton
patent: 3239455 (1966-03-01), Lickus et al.
patent: 3285982 (1966-11-01), Nixon
patent: 3636121 (1972-01-01), Stine et al.
patent: 3636180 (1972-01-01), Broughton
patent: 4044062 (1977-08-01), Korous et al.

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