Process for separation of ethylbenzene or ethylbenzene/p-xylene

Details Process for separation of ethylbenzene or ethylbenzene/p-xylene Process for separation of ethylbenzene or ethylbenzene/p-xylene

1991-12-02

1993-07-13

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585828, C07C 712

Patent

active

052275701

ABSTRACT:
A process for separating ethylbenzene and p-xylene from a xylene isomers mixture, additional containing m-xylene and o-xylene, by selective adsorption of ethylbenzene and p-xylene on a silicalite absorbent is disclosed in the present invention, wherein a compressed gaseous CO.sub.2 stream is used as a carrier for carrying a fixed amount of the mixture to the adsorbent bed for the selective adsorption, followed by a supercritical CO.sub.2 stream desorption of the adsorbed ethylbenzene and p-xylene from the adsorbent bed. A method for recycling the CO.sub.2 used therein is also disclosedby, which involves an isothermal and isobaric adsorption of the xylene isomer products from the effluent CO.sub.2 streams.

REFERENCES:
patent: 3943183 (1976-03-01), Rosback
patent: 4051192 (1977-09-01), Neuzil et al.
patent: 4326091 (1982-04-01), Maas et al.
patent: 4439535 (1984-03-01), Smolin et al.
Ello Santacesaria, et al., "Separation of Xylenes on Y Zeolites in the Vapor Phase. I. Determination of the Adsorption Equilibrium Parameters and of the Kinetic Regime", Ind. Eng. Chem. Process Des. Dev. 1985, 24, 78-83.
Chung-Sung Tan and Jeng-Leei Tsay. "Separation of Xylene Isomers on Silicalite in Supercritical and Gaseous Carbon Dioxide." Ind. Eng. Chem. Res. vol. 29, 502-504, 1990.

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