Adsorptive separation of para-xylene with high boiling desorbent

Details Adsorptive separation of para-xylene with high boiling desorbent Adsorptive separation of para-xylene with high boiling desorbent

1994-10-11

1996-02-27

Gibson, Sharon

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585820, 585826, C07C 712

Patent

active

054950619

ABSTRACT:
The cost of separating para-xylene from other xylene isomers and C.sub.9 aromatics by adsorption on zeolitic molecular sieves is reduced by the use of certain relatively high boiling desorbents including 1,4 diisopropylbenzene. Preferably the adsorbent is an X zeolite adsorbent containing barium or both barium and potassium ions at exchangeable cationic sites. The para-xylene components are selectively adsorbed onto the adsorbent. The non-adsorbed feed is then removed from the adsorbent and the para-xylene recovered by desorption. Any C.sub.9 aromatic hydrocarbons and the other xylene isomers in the raffinate can be separated from these heavy desorbents by fractionation of the raffinate and the desorbent can be recycled to the process.

REFERENCES:
patent: 3686342 (1972-08-01), Neuzil
patent: 4029717 (1977-06-01), Healy et al.
patent: 4886930 (1989-12-01), Zinnen
patent: 5012038 (1991-04-01), Zinnen
patent: 5057643 (1991-10-01), Zinnen
patent: 5159131 (1992-10-01), Zinnen

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