Anil R. Oroskar - Downers Grove IL Roberto E. Prada - Mount Prospect IL James A. Johnson - Clarendon Hills IL Gary C. Anderson - Clarendon Hills IL Hermann A. Zinnen - Summit NJ
Assignee:
UOP - Des Plaines IL
International Classification:
C07C 700 C07C 712
US Classification:
585805
Abstract:
In the process flow scheme for chromatographically separating para-xylene from C. sub. 8 isomers containing substantial amounts of C. sub. 9 aromatic hydrocarbon impurities with BaX or KY zeolite adsorbent and heavy desorbents, e. g. , tetralin and diethyltoluene, a bottoms stream from the extract fractionation column containing desorbent is recycled to the separation unit and a sidecut stream, containing C. sub. 9 aromatic hydrocarbon impurities and a minor amount of the desorbent from the raffinate stream, is directed to the raffinate fractionation column, thereby removing C. sub. 9 aromatic hydrocarbons from the desorbent before recycling the desorbent to the separation unit, and preventing C. sub. 9 aromatics from building up in the desorbent input. A fractionator for the extract column bottoms stream is eliminated, lowering capital costs, and energy requirements for the raffinate column are reduced.
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