| 摘要 |
A process for the separation of xylene isomers which process employs a type X or type Y structured crystalline aluminosilicate adsorbent to selectively adsorb one of the isomers. Adsorbents included are the type X structured and type Y structured zeolites which contain any number of selected cations including Group IA and Group IIA metals. The operations involved are fluid-solid contacting operations in which the particular improvement resides in the use of a two-stage desorption step in which a first diethylbenzene desorbent stream contacts the adsorbent to displace paraxylene from the adsorptive sites upon the adsorbent, and a second desorption stream containing primarily a saturated component contacts the adsorbent to flush the para-diethylbenzene and desorbed xylene from the interstitial void spaces located between the adsorbent particles.
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