Process for separating para-xylene from a C.sub.8 and C.sub.9 ar

Details Process for separating para-xylene from a C.sub.8 and C.sub.9 ar Process for separating para-xylene from a C.sub.8 and C.sub.9 ar

1991-11-14

1992-12-15

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By plural serial diverse separations

585820, 585826, 585828, C07C 704, C07C 713

Patent

active

051719223

ABSTRACT:
In the process flow scheme for chromatographically separating paraxylene from C.sub.8 isomers containing substantial amounts of C.sub.9 aromatic hydrocarbon impurities with an X or Y zeolite adsorbent and heavy desorbents, e.g., tetralin and derivatives thereof and diethyltoluene, a drag stream is split from the extract fractionation column bottoms stream, containing desorbent and C.sub.9 aromatic hydrocarbon impurities for recycling to the separation unit, and is directed to the raffinate fractionation column, where C.sub.9 aromatic hydrocarbons are removed to prevent C.sub.9 aromatic hydrocarbons from building up in the desorbent input to the separation unit. A fractionator for the extract column stream is eliminated, lowering capital costs.

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